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> Upscaling is the most obvious one I don't want any upscaling at all in my photos. One pixel on the sensor must correspond to one pixel in the output.
by grishka 4y ago
> Upscaling is the most obvious one
I don't want any upscaling at all in my photos. One pixel on the sensor must correspond to one pixel in the output.
- astrange 4y agoCamera sensors don't have pixels: https://en.wikipedia.org/wiki/Bayer_filter https://en.wikipedia.org/wiki/Bayer_filter JPEG files also don't have pixels: https://en.wikipedia.org/wiki/Chroma_subsampling https://en.wikipedia.org/wiki/Chroma_subsampling Then again, OLED displays don't either: https://en.wikipedia.org/wiki/PenTile_matrix_family https://en.wikipedia.org/wiki/PenTile_matrix_family
- grishka 4y agoI'm aware of all these things but there still is a 1:1 correspondence between camera sensor pixels and JPEG [luminance] pixels. Yes, color information isn't complete, but it's the right balance. Enlarge it and you aren't adding any new information. Shrink it and you're losing information.
- astrange 4y agoDefinitely not true unfortunately. In particular it's not true for areas colored red or blue, because the green channel doesn't have the luminance information - that's why I mentioned them. Lightroom and at least one current phone camera have ML Bayer demosaicing for this reason and it's visibly sharper. (Note sharpening and enlarging are the same operation.)