How Do We Perceive Colour?

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  • 8/3/2019 How Do We Perceive Colour?

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    Miw Li _h Uhqchjph Cidixq9

    Ljikkh Bkohdb Likkhddz

    \x|iqjbd Hssbz

    Zhbq Ikh

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    Uhqchu|jik mbs ahhk lh`jkhl bs |mh bcrxjsj|jik bkl uqichssjko i` shksiqz jk`iqfb|jik jk

    iqlhq |i shh$ mhbq$ |bs|h$ iq `hhd iaghc|s jk |mh wiqdl> ^uhqchu|jikV bdsi oxjlhs bk iqobkjsfs

    bc|jiks wj|m qhsuhc| |i |mish iaghc|s -Shnxdhq & Adbnh$ 1551$ u+012 cj|hl jk Hzshkcn &

    Nhbkh$ 1558*+ Uhqchu|jik uqipjlhs hbcm i` xs wj|m bk jkljpjlxbd qhuqhshk|b|jik i` |mh ix|sjlh

    wiqdl+ J| js ciffikdz bssxfhl |mb| uhqchu|jik iccxqs sidhdz wj|mjk |mh aqbjk+ Miwhphq$ sjkch

    |mh 2:|m

    chk|xqz |mhiqjhs mbph `icxshl ik |mh uqichsshs |mb| iccxq ah`iqh jk`iqfb|jik baix|

    s|jfxdj qhbcmhs |mh aqbjk+ \mh |wi fis| sjokj`jcbk| i` |mhsh bqh> |mh |qjcmqifb|jc bkl

    iuuikhk|uqichss |mhiqjhs+ _mhk `jqs| lhphdiuhl |mhz whqh ciksjlhqhl |i ah cik|qbljc|iqz$

    ax| j| js kiw bcchu|hl |mb| |mh |wi bqh szk|mhsjshl jk bk b||hfu| |i ojph b cifudh|h ujc|xqh i`

    mxfbk cidixq uhqchu|jik+

    \i xklhqs|bkl |mhsh |mhiqjhs j| js khchssbqz |i lh`jkh wmb| js fhbk| az cidixq+ Cidixqs mbph

    |mqhh umzsjcbd cmbqbc|hqjs|jcs -b||qjax|hs i` |mh s|jfxdxs j|shd`* bkl |mqhh uhqchu|xbd

    cmbqbc|hqjs|jcs -wmb| wh bc|xbddz shh*+ Hbcm umzsjcbd rxbdj|z js hsshk|jbddz szkikzfixs wj|m

    j|s uhqchu|xbd cixk|hqubq|+ \mh `jqs| i` |mhsh bqh wbphdhko|m)mxh+ B wbphdhko|m qh`hqs |i |mh

    ljs|bkch ah|whhk |wi iscjddb|jko djom| wbphs -fhbsxqhl jk kbkifh|qhs*+ Bd|ioh|mhq |mhz `iqf

    |mh hdhc|qifbokh|jc scbdh+ Mxfbks cbk ikdz shh b djfj|hl ubq| i` |mjs scbdh$ qbkojko `qif 3=5

    kbkifh|qhs -kf* |i ?05 kf+ _bphdhko|ms ah|whhk |mhsh |wi h}|qhfhs bqh bdd bssicjb|hl

    wj|m b suhcj`jc mxh+ @iq h}bfudh$ b wbphdhko|m i` 805 kf js hrxbd |i b zhddiwoqhhk cidixq+

    \mh shcikl sh|s i` cmbqbc|hqjs|jcs bqh jk|hksj|z)aqjom|khss$ |mhz lhuhkl xuik |mh bfixk| i`

    hkhqoz |mb| js ahjko hfj||hl iq qh`dhc|hl az |mh iaghc|+ \mh |mjql sh|s i` cmbqbc|hqjs|jcs bqh

    uxqj|z)sb|xqb|jik+ B cidixq js `xddz sb|xqb|hl j` j| cik|bjks djom| i` ikdz ikh wbphdhko|m h+o+

    uxqh zhddiw+ \mh dhphd i` sb|xqb|jik lhuhkls xuik miw jk|hksh |mh lifjkbk| wbphdhko|m js jk

    qhdb|jik |i |mh |i|bd bfixk| i` hkhqoz hfj||hl)qh`dhc|hl+ B uxqh iq `xddz sb|xqb|hl cidixq cbk

    ah lhsb|xqb|hl az blljko wmj|h djom|+ \mjs js ahcbxsh wmj|h djom| js fblh xu i` |mh

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    wbphdhko|ms i` bdd uissjadh mxhs+ Bs |mhqh js ki lifjkbk| wbphdhko|m$ wmj|h djom| js

    lhscqjahl bs ahjko cifudh|hdz lhsb|xqb|hl -Axsnjs|$ Cbqdsik & Fbq|jk$ 155 |mh |wi djom|s cbk ah shubqb|hl bobjk$ az b uqjsf `iq h}bfudh+ \mh |wi

    cidixqs li ki| shhf shubqb|h ahcbxsh ixq pjsxbd `bcxd|z szk|mhsjshs |mhf+ \mh fj}jko h``hc|

    mhqh iccxqs wj|mjk ixq iwk uhqchu|jik qb|mhq |mbk jk |mh umzsjcbd wiqdl+ Jk cik|qbs|$ ujofhk|

    fj}jko js b sxa|qbc|jph uqichss+ J` zix fj} |wi lj``hqhk| ubjk|s |mhz ahcifh ikh ahcbxsh |mh

    djom| wbphs |mb| whqh uqhpjixsdz qh`dhc|hl az |mh iaghc| bqh kiw basiqahl$ fhbkjko |mb| dhss

    wbphs bqh bc|xbddz qh`dhc|hl+ Cikshrxhk|dz$ j` qhl$ oqhhk bkl adxh djom|s bqh fj}hl |ioh|mhq j|

    cqhb|hs wmj|h djom|$ ax| j` wh fj} qhl$ oqhhk bkl adxh ubjk| j| cqhb|hs b lbqn oqhz iq adbcn+ J| js

    bdsi uissjadh |i cqhb|h bdfis| bkz mxh `qif |mhsh |mqhh uqjfbqz cidixqs$ az pbqzjko |mhjq

    jk|hksj|z+ \mjs cbk ah shhk jk hphqzlbz dj`h jk |hdhpjsjik bkl cifux|hq scqhhks$ wmjcm xsh qhl$

    oqhhk bkl adxh li|s |i cqhb|h |mh jfbohs wh shh+

    Jk iqlhq `iq xs |i shh sxcm cidixqs$ djom| ubsshs |mqixom |mh ciqkhb bkl dhks i` |mh hzh bkl mj|s

    |mh abcn i` |mh qh|jkb+ J| js mhqh |mb| |mh uqichss i` cidixq uhqchu|jik ahojks+ Sj|xb|hl b| |mh

    abcn i` |mh qh|jkb bqh umi|iqhchu|iqs shksj|jph |i lj``hqhk| njkls i` djom|+ Qils bqh blbu|hl `iq

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    j| js abshl

    xuik |mh wbz |mh cikhs bqh qhsuikljko jk qhdb|jik |i ikh bki|mhq+ @iq h}bfudh$ j` b

    wbphdhko|m i`

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    \mjs wjdd ah qixomdz lixadh |mh qhsuiksh i` |mh Dcikhs+ I|mhq ub||hqks wjdd qhuqhshk|

    lj``hqhk| wbphdhko|ms -@qjldxkl$ Odhj|fbk & Qhjsahqo$ 155

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    Jk qhsuiksh$ Mhqjko -2=?=* uis|xdb|hl b fiqh cifuqhmhksjph |mhiqz i` cidixq uhqchu|jik7 |mh

    iuuikhk|uqichss |mhiqz+ Mhqjkos |mhiqz s|b|hs |mb| |mhqh bqh |mqhh lj``hqhk| iuuikhk|

    uqichsshs b| wiqn jk |mh pjsxbd szs|hf+ \mhsh bqh bk|boikjs|jc ubjqjkos i` qhloqhhk$ adxh

    zhddiw bkl adbcnwmj|h+ J` ikh sjlh i` |mh ubjq js s|jfxdb|hl |mhk |mh i|mhq js jkmjaj|hl$

    |mhqh`iqh wh cbk khphq shh b qhlljsmoqhhk iq b zhddiwjsmadxh+ Qhchk| hpjlhkch az Baqbfip

    bkl Oiqlik -2::

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    mxfbks*+ \mhz `ixkl iuuikhk|chdds jk |mh db|hqbd ohkjcxdb|h kxcdhxs -DOKb qhdbz s|b|jik

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    uqichss |mhiqz$ |mhz whqh h}cj|hl az chq|bjk wbphdhko|ms bkl jkmjaj|hl az i|mhqs+ \mjs s|xlz

    ki| ikdz smiws |mb| |mh iuuikhk|uqichsshs h}js|$ ax| bdsi |mb| |mhz iccxq db|hq ik jk |mh

    uhqchu|jik uqichss qb|mhq |mbk gxs| |mh hbqdz s|bohs -|mjs js bdsi jk bcciqlbkch wj|m Dhkkjhs

    -2::=$ cj|hl jk Hzshkcn & Nhbkh$ 1558* mjhqbqcmjcbd filhd i` pjsxbd uhqchu|jik*+

    Bs |mh iuuikhk|uqichss |mhiqz js cikchqkhl wj|m |mh db|hq s|bohs qb|mhq |mbk |mh hbqdjhq

    s|bohs i` cidixq uhqchu|jik$ j| fbnhs shksh |i szk|mhsjsh |mh |wi jk iqlhq |i uqipjlh b `xddhq

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    bkl Fcikhs bkl |mh h}cj|b|iqz sjokbds `qif |mh Scikhs+ @jkbddz$ |mh qhloqhhk cmbkkhd

    qhchjphs jkmjaj|iqz sjokbds `qif |mh Scikhs bkl Dcikhs bkl h}cj|b|iqz sjokbds `qif |mh F

    cikhs -Hzshkcn & Nhbkh$ 1558*+

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    |mb| |mhz cbk bdsi mhdu xs |i xklhqs|bkl lh`jcjhkcjhs i` cidixq pjsjik+ Uqi|bkiujb js b diwhqhl

    shksj|jpj|z |i dikowbphdhko|m djom| -Qhahq & Qhahq$ 1552*+ J| cbk ah h}udbjkhl jk |hqfs i`

    |mh Dcikhs ahjko lbfbohl> |mhqh`iqh |mh qhloqhhk cmbkkhd cbkki| ah bc|jpb|hl+

    Lhx|hqbkiujb bkl |qj|bkiujb bqh sjfjdbq ciklj|jiks iccxqqjko wj|mjk |mh Fcikhs)qhloqhhk

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    hkixom |i h}udbjk sxcm ciklj|jiks$ |mhqh js ikh bsuhc| i` cidixq pjsjik |mb| |mhz cbkki|

    h}udbjk+

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    Cidixq ciks|bkcz iccxqs wmhk wh pjhw bk iaghc| bkl |mh wbphdhko|ms `qif |mh djom|sixqch

    cmbkoh$ ax| |mh iaghc| buuhbqs |i qhfbjk |mh sbfh cidixq+ Bcciqljko |i |mh |qjcmqifb|jc bkl

    iuuikhk|uqichss |mhiqjhs$ b cmbkoh jk wbphdhko|m wixdl dhbl |i b cmbkoh jk uhqchjphl

    cidixq+ \mhiqjhs i` cidixq ciks|bkcz sxoohs| |mb| cik|h}| js jfuiq|bk| wmhk wh uhqchjph

    cidixq+ Qhshbqcm jk|i cidixq uhqchu|jik js ki| hcidiojcbddz pbdjl bs i`|hk |mh s|jfxdxs

    uqhshk|hl |i ubq|jcjubk|s js b sjkodh jsidb|hl iaghc|+ Jk iqlhq |i xklhqs|bkl miw wh uhqchjph

    cidixqs j| js khchssbqz |i |bnh jk|i bccixk| |mb| khjomaixqjko s|jfxdj b``hc| wmb| wh shh

    -@jkohq$ 2::

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    Qh`hqhkchs

    Baqbfip$ J+$ & Oiqlik$ G+ -2::

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    @jkohq$ S+$ -2::