Timeline for ColorData["VisibleSpectrum"] is wrong?
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| Aug 11, 2013 at 20:38 | comment | added | adrienlucca.net |
Following CIE's stuff, normalized RGB values of your 591nm laser, at gamma 2.4 are: R = 255 G = -10 B = -139 but you say it's fairly yellow, I assume your M & L cones get saturated with photons...
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| Aug 11, 2013 at 20:36 | comment | added | adrienlucca.net | @Ernst Stelzer Are you sure your retina's cones still differentiate well between "RED" and "GREEN" photons at such light intensities? RED might appear YELLOW if there's LOTS of RED (peaks of M & L cones are quite close...) | |
| Oct 8, 2012 at 12:26 | comment | added | celtschk | Of course it is only a proper comparison with a laser if the monitor is properly calibrated. For example, if his monitor is set to a lower colour temperature than 6500K, then a colour given in sRGB will look more "red shifted". However, I've now looked in the Mathematica documentation what RGB model Mathematica uses, and it doesn't seem to say anywhere; it's actually just an assumption that it uses sRGB. Of course, the exact RGB values corresponding to frequencies depend on the exact RGB model used. If it is really not documented, the RGB values for a given frequency are not well defined. | |
| Oct 8, 2012 at 9:28 | comment | added | Oleksandr R. | @F'x the proper comparison is not with the approximate descriptions but with the laser lines themselves. I'm pretty sure Ernst just included the discs on the LHS for the benefit of people who don't often work with lasers. | |
| Oct 8, 2012 at 9:24 | comment | added | Oleksandr R. | I agree with you; the 488 and 635nm images definitely look quite close to correct. What laser operates at 591nm? I've never used a yellow laser myself except as a by-product (idler wave of an OPO) of producing light around 430nm. | |
| Oct 6, 2012 at 13:35 | comment | added | F'x | “which resembles the colours of the disks well” — looking at your examples, I would actually say it does not match well at all. | |
| Oct 5, 2012 at 20:33 | history | edited | rm -rf♦ | CC BY-SA 3.0 |
deleted 34 characters in body
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| Oct 3, 2012 at 15:57 | history | answered | Ernst Stelzer | CC BY-SA 3.0 |