*HHHHH7H B!B!B!B!B!B Color Vision LHB!B!B!B!B!B œ Color is pleasing B!B!B!B!B!B œ Color is useful bH!B!B!B!B!B!B œ color is ubiquitous in nature: essentially all objects - animate and inanimate - have characteristic colors wHD!B!B!B!B!B!@ color causes objects to stand out D!B!B!B!B!B!@ animals deploy color to draw attention to themselves D!B!B!B!B!B!@ some species deploy color to signal sexual receptivity (why do humans wear make-up?) D!B!B!B!B!B!@ color distinguishes objects that would be indistinguishable based only overall intensity HH!B!B!B!B!B! in effect, color perception can defeat camouflage, by promoting figure/ground segregation wHD!B!B!B!B!B!@ some animals deploy color to blend into their surroundings D!B!B!B!B!B!@ color signals the ripeness of fruits and vegetables and the freshness of meat D!B!B!B!B!B!@ color plays a role in social communication - e.g., facial color (embarassment, anger, fright, illness) LHB!B!B!B!B!B Color is elusive bH!B!B!B!B!B!B œ size, shape, distance, movement - these are aspects of vision that lend themselves to verbal description: we can imagine communicating these ideas about these dimensions to a blind person !B!B!B!B!B!B color defies description independent of itself or representative objects; it is inconceivable how to communicate the experience of color to a blind person !B!B!B!B!B!B color is subjective, as Isaac Newton acknowledged: ... rays are not colored. There is nothing else in them but a certain power ... to produce in us the sensation of this or that color. !B!B!B!B!B!B Unweaving the rainbow -Newtons great discovery - and great heresy! !B!B!B!B!B!B White light of the sun can be decomposed into 7 basic colors (Newton was inclined to look for seven basics because of his knowledge of the 7 tones of the musical scale) !B!B!B!B!B!B ,5,(    XzJ  Xz 0I:9" #K%%DSIDICT:_cv userdict /_cv known not currentdict /bu known and{bu}{save}ifelse userdict /_cv known not dup {userdict /_cv 20 dict put}if _cv begin /bdf{bind def}bind def /isDeviceColor {/currentcolorspace where{pop currentcolorspace 0 get dup /DeviceGray eq exch dup /DeviceRGB eq exch /DeviceCMYK eq or or}{T}ifelse}bdf /setcmykcolor where{/setcmykcolor get /cvcmyk exch def}{/cvcmyk{1 sub 4 1 roll 3{3 index add neg dup 0 lt{pop 0}if 3 1 roll}repeat setrgbcolor pop}bdf }ifelse /stg{isDeviceColor {cf ca /cs load setscreen setgray}{pop}ifelse}bdf /strgb{isDeviceColor {cf ca /cs load setscreen setrgbcolor}{pop pop pop}ifelse}bdf /stcmyk{isDeviceColor {cf ca /cs load setscreen cvcmyk}{pop pop pop pop}ifelse}bdf /min1{dup 0 eq{pop 1}if}bdf currentscreen/cs exch def/ca exch def/cf exch def end currentdict /bn known and{bn}{restore}ifelse  ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #d`drw2} Z ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse # | ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #d`drw2} Z ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse #"؄H ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #d`drw2} Z ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse #"XԄ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #ddrw2 } 1 ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse # SPC SPC "8 ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #qZ|X8DPTXXTPD8|8|,  ,8 SPC SPC # ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse # # # ########### # ## # # # ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #dpdrw2 K'΀ррԀԀՀՀրրրրՀՀԀԀрр΀΀΀΀ˀˀȀȀǀǀƀƀƀƀǀǀȀȀˀˀ΀΀ ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse # SPC SPC # ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse ## ## ###################### ## #### ## ## ## ###:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #d`drw2  }0SG  ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse # SPC SPC "  ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #q 4  44  SPC SPC # ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse # #!4#! ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #ddrw2  }R     ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse # SPC SPC # ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse ###!4###! ###:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #d`drw2 }0SG ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse # SPC SPC "  ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #q L  LL  SPC SPC # ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse # #,#,## ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse #dpdrw2 }E ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse # SPC SPC "D ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse #q&$D D4$$4 4 D SPC SPC # ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse # ####,####:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #d`drw2} Z ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse # 44 ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #d`drw2 "}"  Z ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse # 0 ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #d`drw2#9}#9 Z ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse #  ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #d`drw2 9} 9 Z ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse # , ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #d`drw2*}* Z ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse # ld ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #d`drw2+}+ Z ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse # \ ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #d`drw2+}+ Z ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse # ` ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #d`drw2,}, Z ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse # ` ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #d`drw2+ }+  Z ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse # $X ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #d`drw2+}+ Z ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse # P` ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #d`drw2+}+ Z ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse # `\##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #d`drw2 } ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse # SPC SPC "\ ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #q\|t\t|t|\\ SPC SPC # ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse # #!|t#!\##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #ddrw2 }B ŀŀŀŀŀ ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse # SPC SPC # ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse ###!|t###!\# ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #d0drw27}##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #ZHH r Z\|x@                           3  3333ff3f3ff3f fffff ̙       f f f33f3 3 3 3 33 33f3 33f3 f f f f f3ff   33 333 333 f3f f3f f3f f f f ̙ ̙ ̙     ddrw2D,5 !B!B!B!B!B!B Colored light could be recombined to create white light (process was reversible) !B!B!B!B!B!B !B!B!B!B!B!B CGC:   pl i pl 0I:9" #%%DSIDICT:_cv userdict /_cv known not {userdict /_cv 20 dict put}if _cv begin /bdf{bind def}bind def /isDeviceColor {/currentcolorspace where{pop currentcolorspace 0 get dup /DeviceGray eq exch dup /DeviceRGB eq exch /DeviceCMYK eq or or}{T}ifelse}bdf /setcmykcolor where{/setcmykcolor get /cvcmyk exch def}{/cvcmyk{1 sub 4 1 roll 3{3 index add neg dup 0 lt{pop 0}if 3 1 roll}repeat setrgbcolor pop}bdf }ifelse /stg{isDeviceColor {cf ca /cs load setscreen setgray}{pop}ifelse}bdf /strgb{isDeviceColor {cf ca /cs load setscreen setrgbcolor}{pop pop pop}ifelse}bdf /stcmyk{isDeviceColor {cf ca /cs load setscreen cvcmyk}{pop pop pop pop}ifelse}bdf /min1{dup 0 eq{pop 1}if}bdf currentscreen/cs exch def/ca exch def/cf exch def end ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse #d`drw2 !l#}5Pl#!#5##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse # SPC SPC " ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse #q>##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse ##l!!! ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #d`drw20V}V0 Z ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse # V"z ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #d`drw200}00 Z ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse # ~ ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #d`drw20V}V0 Z ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse # V ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #d`drw2,LA}A,L Z ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse # . ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #d`drw2!N@}@!N Z ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse # 6 ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #d`drw2M@}@M Z ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse # V2 ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #d`drw2 M@}@ M Z ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse # *2 ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #d`drw2OA}AO Z ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse # : ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #d`drw23MA}A3M Z ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse # 2 ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #d`drw2NA}AN Z ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse # 6##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #d`drw2 HBN}BNBHHNBN ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse # SPC SPC " : ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #q" : : "": : ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse ##!"#! :##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #d`drw2kk}kk Z ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse # \ ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #d`drw2\{}{\ Z ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse #"|H ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #d`drw2[z}z[ Z ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse #"脸##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #ddrw2 dt} 1tsrollifeddefillorst ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse # SPC SPC " ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #qZ ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse ## # ########### # ## # # # ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #dpdrw2 dtK'tssrroolllliiffeeddddeeffiilllloorrsstt ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse # SPC SPC # ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse ## ## ###################### ## #### ## ## ## ###:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #d`drw2 (}0SG(( ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse # SPC SPC "x ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #qxxxx ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse ##!#!x ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse #dpdrw2 }E ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse # SPC SPC " ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse #q&    ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #####,####:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #ddrw2 &}R &&&& ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse # SPC SPC # ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse #"ph#!|###!ph# ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #d`drw2Ԁ} Z ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse # XP ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #d`drw2} Z ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse # XT ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #d`drw2} Z ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse #  ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #d`drw2K}K Z ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse # p, ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #d`drw2I}I Z ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse # t$ ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #d`drw2 J} J Z ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse # t0( ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #d`drw2J}J Z ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse # x\( ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #d`drw2$H}$H Z ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse # t  ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #d`drw2J}J Z ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse # t( ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #d`drw23I}3I Z ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse # t$##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #d`drw2 I:O}IO:O:II ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse # SPC SPC "$ ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #q$<$<<$$ ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse ##!<#!$##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #ddrw2 I:O}B IOO:O:O:I:III ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse # SPC SPC # ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse ###!<###!$# ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #d0drw27I:P}##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #ZHH  hZ$@                           3  3333ff3f3ff3f fffff ̙       f f f33f3 3 3 3 33 33f3 33f3 f f f f f3ff   33 333 333 f3f f3f f3f f f f ̙ ̙ ̙      ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse #dpdrw2 @H}EHwD@w@wDDHw ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse # SPC SPC "  ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse #q&    ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #########:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #d`drw2DD7}DD7 Z ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse # N ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #d0drw28N }##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #Q:6 ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse #X ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #d`drw2CDnCD Z ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse # ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse #"  ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #d`drw2DD}DD Z ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse # ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse #" ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #d`drw2DD}DD Z ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse ###:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #"X ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #d`drw2 0SG ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse # SPC SPC "` ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #q```` ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse ##,#,####:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #d`drw2tt Z ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse # ddrw2DCG !B!B!B!B!B!B A basic color is one that cannot further be decomposed upon passing through a prism !B!B!B!B!B!B @@   Z*:J Z*: 0I:9"6 #K%%DSIDICT:_cv userdict /_cv known not currentdict /bu known and{bu}{save}ifelse userdict /_cv known not dup {userdict /_cv 20 dict put}if _cv begin /bdf{bind def}bind def /isDeviceColor {/currentcolorspace where{pop currentcolorspace 0 get dup /DeviceGray eq exch dup /DeviceRGB eq exch /DeviceCMYK eq or or}{T}ifelse}bdf /setcmykcolor where{/setcmykcolor get /cvcmyk exch def}{/cvcmyk{1 sub 4 1 roll 3{3 index add neg dup 0 lt{pop 0}if 3 1 roll}repeat setrgbcolor pop}bdf }ifelse /stg{isDeviceColor {cf ca /cs load setscreen setgray}{pop}ifelse}bdf /strgb{isDeviceColor {cf ca /cs load setscreen setrgbcolor}{pop pop pop}ifelse}bdf /stcmyk{isDeviceColor {cf ca /cs load setscreen cvcmyk}{pop pop pop pop}ifelse}bdf /min1{dup 0 eq{pop 1}if}bdf currentscreen/cs exch def/ca exch def/cf exch def end currentdict /bn known and{bn}{restore}ifelse  ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #d`drw255}55 Z ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse # @ ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #d`drw2&E}E& Z ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse #"`H ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #d`drw2%D}D% Z ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse #"##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #ddrw2 .>}Y*>=<96630/../03669<=> ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse # SPC SPC " ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #qZh|plhhlp| SPC SPC # ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse # # # ########### # ## # # # ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #dpdrw2 .>nK'>==<<9966663300//....//0033666699<<==>> ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse # SPC SPC # ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse ## ## ###################### ## #### ## ## ## ###:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #d`drw2 Ww|}SWwW||wWw ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse # SPC SPC "\ ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #q\\\\ SPC SPC # ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse # #!#!\##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #ddrw2 Ww|}R WwW|W|||wwWwWw ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse # SPC SPC # ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse ###!###!\###:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #d`drw2 t}Sttt ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse # SPC SPC "p ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #qpppp SPC SPC # ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse # #,#,## ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse #dpdrw2 }E ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse # SPC SPC " ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse #q&tHttHH SPC SPC # ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse # ####,####:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #d`drw2>}> Z ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse #  ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #d`drw2} Z ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse # <l ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #d`drw2Ȁ}Ȁ Z ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse # <  ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #d`drw2Ȁ}Ȁ Z ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse # h  ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #d`drw2(}( Z ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse # h ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #d`drw2&}& Z ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse # l ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #d`drw2'}' Z ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse # l ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #d`drw2'}' Z ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse # l@ ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #d`drw2%}% Z ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse # ht ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #d`drw2'}' Z ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse # h ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #d`drw2&}& Z ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse # h##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #d`drw2 &,}&,,&& ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse # SPC SPC "d ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #qdddd SPC SPC # ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse # #!#!d##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #ddrw2 &,}B &,,,,&&&& ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse # SPC SPC # ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse ###!###!d###:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #d`drw2 #.}#..## ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse # SPC SPC " ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #q,,, SPC SPC # ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse # 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$` ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #d0drw27&-}##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #YHH r Yh@                           3  3333ff3f3ff3f fffff ̙       f f f33f3 3 3 3 33 33f3 33f3 f f f f f3ff  33 33 333 f3f f3f f3f f f f ̙ ̙ ̙       ddrw2D@ !B!B!B!B!B!B Basic colors can be recombined to create new colors, which can be again decomposed into the basics !B!B!B!B!B!B v?6v26    J   0I:9"yO #K%%DSIDICT:_cv userdict /_cv known not currentdict /bu known and{bu}{save}ifelse userdict /_cv known not dup {userdict /_cv 20 dict put}if _cv begin /bdf{bind def}bind def /isDeviceColor {/currentcolorspace where{pop currentcolorspace 0 get dup /DeviceGray eq exch dup /DeviceRGB eq exch /DeviceCMYK eq or or}{T}ifelse}bdf /setcmykcolor where{/setcmykcolor get /cvcmyk exch def}{/cvcmyk{1 sub 4 1 roll 3{3 index add neg dup 0 lt{pop 0}if 3 1 roll}repeat setrgbcolor pop}bdf }ifelse /stg{isDeviceColor {cf ca /cs load setscreen setgray}{pop}ifelse}bdf /strgb{isDeviceColor {cf ca /cs load setscreen setrgbcolor}{pop pop pop}ifelse}bdf /stcmyk{isDeviceColor {cf ca /cs load setscreen cvcmyk}{pop pop pop pop}ifelse}bdf /min1{dup 0 eq{pop 1}if}bdf currentscreen/cs exch def/ca exch def/cf exch def end currentdict /bn known and{bn}{restore}ifelse  ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #d`drw2V"}"V Z ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse # 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x$ ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #d`drw2yK}yK Z ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse # x, ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #d`drw2yJ}yJ Z ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse # x,(##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #d`drw2 xJP}xJxPPJxJ ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse # SPC SPC "( ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #q(H@(@H@H(( SPC SPC # ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse # #!H@#!(##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #ddrw2 xJP}B xJxPxPҀPҀPҀJҀJxJxJ ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse # SPC SPC # ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse ###!H@###!(###:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #d`drw2 GR}GRRGG ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse # SPC SPC "$ ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #q$PH$$HPHP$ SPC SPC # ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse # #,#,## ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse #dpdrw2 }S ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse # SPC SPC "P ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse #q&8\PD88\\P SPC SPC # ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse # ## ##$####:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #d`drw2U}U Z ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse # T> ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #d`drw2X=XX=X Z ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse # h`` ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #d`drw2"I4h}"h4I Z ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse #"H ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #d`drw2"H4g}4g"H Z ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse #"##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #ddrw2 $Q4a},a/`2_3\4Y4Y3V2S/R,Q,Q)R&S%V$Y$Y%\&_)`,a ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse # 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Z ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse # Pd ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #d`drw2?}? Z ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse # Td ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #d`drw2} Z ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse # dd ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #d`drw2/N}N/߀ Z ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse # h8| ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #d`drw2.M}M. Z ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse # <4 ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #d`drw2.M}M. Z ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse # 4 ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #d`drw2.L}L. Z ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse # 0 ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #d`drw2/M}M/ Z ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse # 4 ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #d`drw2!/M}!M/ Z ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse # 4 ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #d`drw2/M}M/ Z ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse # t4##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #d`drw2 J0P}JP0P0JJ ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse # SPC SPC "X( ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #qX(@X(X@@(X( SPC SPC # ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse # #!@#!X(##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #ddrw2 J0P} րJրPրP0P0P0J0JրJրJ ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse # SPC SPC # ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse ###!@###!X(###:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #d`drw2 =FHQ}=F=QHQHF=F ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse # SPC SPC " ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #q DD D  SPC SPC # ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse # #,#,## ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #d`drw2 H S}HS S HH ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse # SPC SPC " ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #q $L L$L$  SPC SPC # ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse # #,#,####:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #d1drw2_)|} ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse # 8ddrw2:ddrw2:$d4drw2: &&9&&, Palatino 0.(}"red"ddrw2:"#:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #d1drw2]} ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse # 9ddrw2:ddrw2:$d4drw2: ::##Q::##(u"green"ddrw2: "#F1 0.898 0 userdict /_cv known{_cv begin strgb end}{pop pop pop}ifelse #d`drw2   ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse # SPC SPC " ##F1 0.898 0 userdict /_cv known{_cv begin strgb end}{pop pop pop}ifelse #q SPC SPC # ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse # #!#!##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #d1drw2} ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse # ;ddrw2:ddrw2:$d4drw2: !!]!!("yellow"ddrw2: "#:0 userdict /_cv known {_cv begin stg end}{pop}ifelse #dpdrw2 v ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse # SPC SPC ", ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse #q&,L,<LLDD, SPC SPC # ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse # ######(##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #dxdrw2 Ԁ}ԀӀӀǀπǀπ̀ɀ̀ɀЀ ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse # SPC SPC # ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse #"P ###### ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #d0drw27yJQ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #YHH r Y(HD@                           3  3333ff3f3ff3f fffff ̙       f f f33f3 3 3 3 33 33 33f3 f f f f3ff3ff  33 33 333 f3f f3f f3f f f f ̙ ̙ ̙       ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #d0drw27J0Q}##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #ZHH r ZX(D@        ̙ ̙ ̙ f f f f3f f3f f3f 333 33 33 3ff3ff f f f f 33f3 33 33 3 3 3 f33f3 f33f3 f       ̙ ̙ff f f3ff3f333333  3 3                          ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse #d`drw2 yOU}yOyUUOyO ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse # SPC SPC "< ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse #q<DT<TDTD<< SPC SPC # ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse # #!DT#!< ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #d`drw2 OY}OYYOO ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse # SPC SPC "< ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #q<d<dd<< SPC SPC # ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse # #(#$## ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse #d`drw2 P.V}.V.PPV.V ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse # SPC SPC "X ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse #q\@XX@\@\XX SPC SPC # ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse # #!\@#!X ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #d`drw2 P$Y}PY$Y$PP ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse # SPC SPC "l@ ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse #ql@dl@ldd@l@ SPC SPC # ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse # #$#$## ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse #dpdrw2 } ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse # SPC SPC "l ##:0 userdict /_cv known {_cv begin stg end}{pop}ifelse #q&Xl|XXl SPC SPC # ##:1 userdict /_cv known {_cv begin stg end}{pop}ifelse # ######ddrw2Dv? !B!B!B!B!B!B the color produced by isolating light at 570 nm is indistinguishable from the color produced by adding light at 520 nm and 680 nm. Why? LHB!B!B!B!B!B What, exactly, is color - a perceived quality of surfaces determined by: bH!B!B!B!B!B!B œ spectral content of ambient illumination wHD!B!B!B!B!B!@ ambient light from the sun or from electric bulbs contains energy over the entire visible spectrum of wavelengths (think about what happens when light is passed through a prism), but in differing proportions; different light sources are composed of differing extents of light from the visible spectrum HH!B!B!B!B!B! suppose you take a picture indoors with the lights on, using daylight color film in your camera? what does the picture look like? bH!B!B!B!B!B!B pigmentation of reflecting surface wHD!B!B!B!B!B!@ molecular structure of surface material determines the percentage of incident light absorbed by that surface and the percentage reflected from the surface to the eye D!B!B!B!B!B!@ a surfaces color depends on the light reflected (i.e., not absorbed); in a sense, the skin of a red apple is everything but red. Some examples: HH!B!B!B!B!B! lemon H!B!B!B!B!B! tomato H!B!B!B!B!B! white paper H!B!B!B!B!B! gray paper bH!B!B!B!B!B!B number of distinct cone photopigments (i.e., light absorbing molecules) in the eye, and the spectral sensitivities of those pigments wHD!B!B!B!B!B!@ normal human eye contains 3 distinct cone photopigments HH!B!B!B!B!B! k^ 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ffff33iff 3ff333333f3f3fffff̙ff3f3x ̙̙fff3f333f3ff̙3f̙f3f3ff33efff333f̙33fff f3333a̙ff333ff3f3ffffff3ff333r̙ff33ff333 f3ff3ff̙̙33ff̙fffff333sfff3f33f3ff̙3ffff̙f3f33p ffff3f3f33f333fffff ̙fff33f33g̙f3ff33ff3ff ̙̙̙fff33ff4HH  -s"D3f3f33f33" f333ff3f33Df33f3f" "3333$UU3f3f3333%Uw33f333"U"f3ff3-w"D3DU 3f333f3f33Df3f3f3U3f3f333333f3ff3f3f3f3f33ff333f333f3f33ff33f3ff333 3ff33ff33f3f33f3ff3f333ff3f33 wHD!B!B!B!B!B!@ question: in a 3-pigment cone system, is there a single wavelength of light that can give rise to the perception of white? D!B!B!B!B!B!@ question: in a 2-pigment cone system, is there a single wavelength of light that can give rise to the perception of white? bH!B!B!B!B!B!B state of visual adaptation of the eye (color adaptation) !B!B!B!B!B!B color of neighboring regions in the visual scene (color contrast) !B!B!B!B!B!B healthy brain (recall the colorblind painter) LHB!B!B!B!B!B Our childhood introduction to color: the paintbox, the prism and the color television bH!B!B!B!B!B!B œ in middle school, we were shown how white light passed through a prism fanned out into a rainbow of colors - in fact, this prism effect is the basis of rainbows (rain particles behave like tiny prisms). Light that cannot be further decomposed into finer gradations of color is called monochromatic or pure !B!B!B!B!B!B in elementary school, we were taught how to mix two colors to obtain a third wHD!B!B!B!B!B!@ paints contain pigments that absorb certain wavelengths of light (e.g., red paint absorbs all wavelengths but the very longest ones, and these long wavelengths are reflected from the surface to an observers eye; mix the red paint with another color paint and the reflected light will be further limited - this is subtractive color mixture - the greater the amount of paint added, the darker the color (which is why interior decorators avoid painting walls with saturated colors - the room becomes too dark). D!B!B!B!B!B!@ Most colors we perceive in the natural environment are the result of subtractive color principles, because surfaces are naturally painted (i.e., they have pigments that absorb light energy) bH!B!B!B!B!B!B from infancy, weve enjoyed the pictures displayed on a color tv, which operates on the principle of additive color mixture wHD!B!B!B!B!B!@ projected light D!B!B!B!B!B!@ color television screens are composed of tiny ( 0.2 mm) dots that are red, green or blue; the dots are so small that their emitted light effectively adds together before reaching our eyes; by varying the proportion of energy produced by each of the three, the television is able to reproduce most of the colors of the spectrum D!B!B!B!B!B!@ pontillist paintings LHB!B!B!B!B!B Some further observations on color additivity bH!B!B!B!B!B!B œ G + R --> Y, when G &R are roughly equal in intensity; varying the relative amounts of R & G will vary the product from pure green, through olive, yellow, orange and, finally, red. !B!B!B!B!B!B the yellow produced by mixing red and green is indistinguishable from pure yellow associated with 570 nm light. The two are said to be metameric (physically different but psychologically identical). Why is this so? !B!B!B!B!B!B G + R + B --> white; these are known as primary colors wHD!B!B!B!B!B!@ by reasoning, B + Y --> ??? (think about what primaries comprise Y) D!B!B!B!B!B!@ any two colors that produce white (or an achromatic color) are called complementary colors LHB!B!B!B!B!B Color phenomena to be explained bH!B!B!B!B!B!B œ color mixture: white light can be produced by selected combinations of three colors (homework exercise) !B!B!B!B!B!B colored afterimages: a white surface appears colored after prolonged exposure to a colored surface (demonstration) !B!B!B!B!B!B color contrast - perceived color depends on colors in immediate surroundings; color shadows provide one example of color contrast (demonstration) !B!B!B!B!B!B color constancy - perceived color remains unchanged despite large changes in the wavelength composition of the incident (and, hence, reflected) light !B!B!B!B!B!B color catgeories - all cultures have red, yellow, green, and blue (as well as black and white) !B!B!B!B!B!B acute color discrimination - we are very good at discriminating subtle differences in hue (homework assignment, to turn in) !B!B!B!B!B!B color deficiency !B!B!B!B!B!B color vision in other species