Demosaicing and bit dimensions

Started 8 months ago | Discussions thread
D Cox
Senior MemberPosts: 6,955
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Re: Demosaicing and bit dimensions
In reply to Mark Scott Abeln, 8 months ago

If your subject was entirely red or entirely blue it might make sense to simply discard the other three pixels in each group.

For example, if you were photographing a poster printed in black ink on red paper.

In a typical scene, most colours are not highly saturated. The assumption that, if a green pixel is bright, a red pixel that was in the same place would also have been bright works quite well. This is the basis of the demosaic algorithms.

So we can generally treat each single colour pixel as recording all colours, and a 16 Megapixel camera as having 16 million full colour pixels rather than 4 million. But the result will never be quite as sharp for fine colour detail as from a Foveon sensor with the same number of pixels.

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