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	Is this a fake science or an obsolete disproved theory? If not, could anybody find a reference to an authoritative source?] (]) 08:37, 28 April 2019 (UTC)		Is this a fake science or an obsolete disproved theory? If not, could anybody find a reference to an authoritative source?] (]) 08:37, 28 April 2019 (UTC)

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			:I don't know where this comes from. Possibly there's a confusion between the absorption curves (like that above in birds) and the spectral sensitivity? Or there are incorrect inferences from the basis functions used in typical RGB spaces? ] (]) 15:56, 28 April 2019 (UTC)

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The second (violet) maximum of the sensitivity of the red cones

(I recently started this topic, but after that all the talks from 2006 to 2019 ended by my message were automatically archived.)

The four pigments in a bird's cone cells (in this example, estrildid finches) extend the range of color vision into the ultraviolet.

In some sites (e.g. https://midimagic.sgc-hosting.com/huvision.htm) I see charts of light sensitivity curves looking different. Namely, the curve of the red-sensitive cones has a second (tiny) peak in the violet range. It is said:

The erythropsin in the red-sensitive cones is sensitive to two ranges of wavelengths. The major range is between 500 nm and 760 nm, peaking at 600 nm. This includes green, yellow, orange, and red light. The minor range is between 380 nm and 450 nm, peaking at 420 nm. This includes violet and some blue. The minor range is what makes the hues appear to form a circle instead of a straight line.

This small maximum is said to explain why the visible light with the shortest wavelength looks violet (rather than dark blue), while the visible light with the longest wavelength looks dark red.

There is no reference to scientific papers neither numerical tables in https://midimagic.sgc-hosting.com/huvision.htm. I have not found any evidence of that in Misplaced Pages except that of a bird's cone cells rather than human's (see the chart):

Is this a fake science or an obsolete disproved theory? If not, could anybody find a reference to an authoritative source?Ufim (talk) 08:37, 28 April 2019 (UTC)

References

Figure data, uncorrected absorbance curve fits, from Hart, NS; Partridge, JC; Bennett, ATD; Cuthill, IC (2000). "Visual pigments, cone oil droplets and ocular media in four species of estrildid finch". Journal of Comparative Physiology A. 186 (7–8): 681–694. doi:10.1007/s003590000121.

I don't know where this comes from. Possibly there's a confusion between the absorption curves (like that above in birds) and the spectral sensitivity? Or there are incorrect inferences from the basis functions used in typical RGB spaces? Dicklyon (talk) 15:56, 28 April 2019 (UTC)

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