Am 01.02.20 um 13:27 schrieb Heiko Bauke:
Hi,
all blend modes that operate in Lab space have some special treatment
for the case that a module sets the flag IOP_FLAGS_BLEND_ONLY_LIGHTNESS.
However, I cannot find any module that actually sets this flag.
Furthermore, it seams to me not reasonable why the behavior of a blend
mode should depend on a module flag.
Can we get rid of this? Is there any good reason why we have this in
darktable?
I think yes. I remember faintly that in the very early days of blending
(+8 year ago) there have been a use case but that has been overcome
shortly after. So this in fact a stale left-over.
Ulrich
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