Colorspace clarification....

[age]

@elstoc

I (and @priort) have asked for objective evidence

Try It yourself

OKLAB, CIELAB, linear CIELAB tonemapping

Oklab, Cie Lab and linear Cie Lab, are these color spaces capable of hdr handling? Yes, they are perfectly fine for hdr image processing, what they can’t do is only to encode an hdr image in a 10bit compressed file because hdr values are above 1.0. How to correctly apply a tonemapping operator like reinhard with these color spaces? just linearize the L channel, do the tone mapping, re-apply the transfer curve, do the saturation correction. Saturation correction: the input/tonemapped norm rati…

You could import in gimp an unsharpened image and try the linear or gamma unsharp mask, the linear usm will have a lot more artifacts

Survey on the linear workflow

Also: what is ultra-low gamma?