Image:Spectrum441pxWithnm.png

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Spectrum441pxWithnm.png‎ (441 × 80 pixel, file size: 11 KB, MIME type: image/png)

Attempt at true-colour spectrum, although LMS cone stimulus is probably out of proportion, wavelength in nanometres marked

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Explanation: this image was generated based on published data regarding the sensitivities of the cones in the human retina, and the typical colors and the gamma of the R, G, and B components of computer displays. It is designed to look like a flat spectrum (constant power per wavelength interval) with some background illumination. The background illumination (the grey background) is necessary mainly to simulate the effect of short wavelengths, which otherwise would require an impossible negative G component.

The spectrum is somewhat faint because that is the only way to represent a flat spectrum on an RGB display with the correct intensities at the far violet end of the spectrum. This low intensity causes the yellow-orange region to look brownish, exactly as it would look like in reality.

A large dark background, as below, helps to reduce this perception as brown of yellow and orange. How the image is generated was discussed extensively on Talk:colour blindness

Image:Spectrum441pxWithnm.png

File history

Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version.
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  • (del) (cur) 22:43, 16 May 2004 . . Cyp ( Talk | contribs) . . 441×80 (11,174 bytes) (Changed gamma of image from 2.5 to 1.5)
  • (del) (rev) 23:03, 5 May 2004 . . Cyp ( Talk | contribs) . . 441×80 (12,989 bytes) (Yet another matrix...)
  • (del) (rev) 12:11, 5 May 2004 . . Cyp ( Talk | contribs) . . 441×80 (12,525 bytes) (Using new LSM->RGB matrix, since the previous LSM->RGB matrix actually had nothing to do with LSM.)
  • (del) (rev) 16:08, 4 May 2004 . . Cyp ( Talk | contribs) . . 441×80 (12,448 bytes) (Fixed LMS balance (I hope))
  • (del) (rev) 12:16, 4 May 2004 . . Cyp ( Talk | contribs) . . 441×80 (10,921 bytes) (Attempt at true-colour spectrum, although LMS cone stimulus is probably out of proportion, wavelength in nanometres marked {{msg:GFDL}})

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