Since when is purple blue?

Started Sep 14, 2011 | Discussions thread
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Leonard Migliore
Leonard Migliore Forum Pro • Posts: 13,455
That sounds correct

L Bourdillon wrote:

Often I'll see much the same thing - blue not violet (purple?). And on any RGB sensor camera.

This could be due to the original "creation" of the color. From the visual aspect, violet can be formed in two ways: a mixture of red and blue, or a true color spectral line in the violet.

If the color has two lines (i.e. red and blue) the RGB sensor can usually reproduce this effectively. Many man-made dyes for clothing, etc., are mixes.

However, with a true violet line, the RGB sensor has only the blue pixels receiving (limited) information and the color is too blue.

Interestingly, the violet color in most flowers is a single violet line - and, many flying (pollinating) insects have vision the peaks in the violet-to-ultra-violet.

Very nice explanation; looks like the only way out would be to have the red filter leak a little UV.
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Leonard Migliore

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