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File:Cones and Photopic smj2.png

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Cones_and_Photopic_smj2.png (356 × 265 pixels, file size: 7 KB, MIME type: image/png)

Summary

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Description
English: I made this in matlab (and screen captured it as a quick hack), from quantal data at http://www.cvrl.org/database/text/cones/smj2.htm. The black curve is a linear combination of the long and medium cone responses, and represents the photopic luminosity function. Probably other data sets are less lumpy.

Here's the code: 

 % http://www.cvrl.org/database/text/cones/smj2.htm

 conelogQdata = [ ...
   390,   -3.0536,  -3.1218,  -1.8575
   395,   -2.6325,  -2.6873,  -1.4547
   400,   -2.3323,  -2.3991,  -1.1582
   405,   -2.0247,  -2.0729,  -0.8393
   410,   -1.7957,  -1.8257,  -0.6069
   415,   -1.6600,  -1.6650,  -0.4141
   420,   -1.5187,  -1.4822,  -0.2550
   425,   -1.4501,  -1.3680,  -0.1432
   430,   -1.3922,  -1.2659,  -0.0835
   435,   -1.3344,  -1.1736,  -0.0378
   440,   -1.2716,  -1.0844,  -0.0103
   445,   -1.2323,  -1.0269,   0.0000
   450,   -1.1974,  -0.9771,  -0.0408
   455,   -1.1460,  -0.9159,  -0.0921
   460,   -1.0725,  -0.8364,  -0.1178
   465,   -0.9894,  -0.7564,  -0.1928
   470,   -0.9006,  -0.6754,  -0.2351
   475,   -0.8224,  -0.6067,  -0.3359
   480,   -0.7603,  -0.5561,  -0.4687
   485,   -0.7056,  -0.5121,  -0.6037
   490,   -0.6324,  -0.4519,  -0.7369
   495,   -0.5422,  -0.3785,  -0.8579
   500,   -0.4505,  -0.3036,  -0.9869
   505,   -0.3575,  -0.2249,  -1.1168
   510,   -0.2766,  -0.1596,  -1.2672
   515,   -0.2050,  -0.1025,  -1.4381
   520,   -0.1440,  -0.0545,  -1.6145
   525,   -0.0984,  -0.0239,  -1.8070
   530,   -0.0645,  -0.0056,  -1.9975
   535,   -0.0434,   0.0000,  -2.1850
   540,   -0.0312,  -0.0036,  -2.3691
   545,   -0.0177,  -0.0066,  -2.5498
   550,   -0.0065,  -0.0139,  -2.7273
   555,   -0.0023,  -0.0318,  -2.9016
   560,   -0.0053,  -0.0597,  -3.0728
   565,   -0.0050,  -0.0874,  -3.2411
   570,    0.0000,  -0.1132,  -3.4064
   575,   -0.0048,  -0.1560,  -3.5689
   580,   -0.0171,  -0.2128,  -3.7286
   585,   -0.0289,  -0.2694,  -3.8856
   590,   -0.0444,  -0.3343,  -4.0400
   595,   -0.0668,  -0.4155,  -4.1919
   600,   -0.0954,  -0.5065,  -4.3412
   605,   -0.1301,  -0.6048,  -4.4880
   610,   -0.1725,  -0.7153,  -4.6326
   615,   -0.2231,  -0.8382,  -4.7747
   620,   -0.2824,  -0.9675,  -4.9146
   625,   -0.3510,  -1.1030,  -5.0523
   630,   -0.4299,  -1.2484,  -5.1879
   635,   -0.5179,  -1.4024,  -5.3213
   640,   -0.6131,  -1.5588,  -5.4527
   645,   -0.7169,  -1.7152,  -5.5821
   650,   -0.8318,  -1.8748,  -5.7096
   655,   -0.9581,  -2.0376,  -5.8350
   660,   -1.0928,  -2.2038,  -5.9586
   665,   -1.2337,  -2.3715,  -6.0804
   670,   -1.3788,  -2.5374,  -6.2004
   675,   -1.5257,  -2.6991,  -6.3186
   680,   -1.6747,  -2.8577,  -6.4351
   685,   -1.8271,  -3.0183,  -6.5500
   690,   -1.9841,  -3.1809,  -6.6632
   695,   -2.1495,  -3.3474,  -6.7747
   700,   -2.3213,  -3.5155,  -6.8848
   705,   -2.4916,  -3.6812,  -6.9932
   710,   -2.6521,  -3.8405,  -7.1003
   715,   -2.8055,  -3.9935,  -7.2057
   720,   -2.9676,  -4.1481,  -7.3098
   725,   -3.1275,  -4.3010,  -7.4125
   730,   -3.2852,  -4.4521,  -7.5137
   ];

 lambda = conelogQdata(:,1);
 responses = 10.^conelogQdata(:,[2 3 4]);
 photopic = responses(:,[1 2]) * [0.68273; 0.35235];

 figure(1); hold off
 plot(lambda, responses)
 hold on
 plot(lambda, photopic, 'k')
 hold off
axis([380 720 0 1.05])
Date 25 May 2007 (original upload date)
Source Transferred from en.wikipedia to Commons by Premeditated Chaos using CommonsHelper.
Author Dicklyon at English Wikipedia
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Licensing

Public domain This work has been released into the public domain by its author, Dicklyon at English Wikipedia. This applies worldwide.
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Dicklyon grants anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law.

Original upload log

The original description page was here. All following user names refer to en.wikipedia.
  • 2007-05-25 05:00 Dicklyon 356×265× (7459 bytes) I made this in matlab (and screen captured it as a quick hack), from quantal data at http://www.cvrl.org/database/text/cones/smj2.htm. The black curve is a linear combination of the long and medium cone responses, and represents the photopic luminosity f

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current23:08, 21 February 2012Thumbnail for version as of 23:08, 21 February 2012356 × 265 (7 KB)File Upload Bot (Magnus Manske) {{BotMoveToCommons|en.wikipedia|year={{subst:CURRENTYEAR}}|month={{subst:CURRENTMONTHNAME}}|day={{subst:CURRENTDAY}}}} {{Information |Description={{en|I made this in matlab (and screen captured it as a quick hack), from quantal data at http://www.cvrl.or

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