Evidently, this is the issue:
Digital cameras are able to reproduce purple, but only within the sRGB color space, which excludes "deep purple" or "ultra-violet" tones.
Therefore if the purple tone is outside the sRGB color space it gets converted into a blue, the high-frequency violet is simply outside the camera's native colour space.
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In response to this post by dukedog)
Posted: 12/09/2016 at 8:52PM