On 30/01/17 10:13, johannes hanika wrote:
hi,
i suppose you've seen this
http://www.darktable.org/2016/05/colour-manipulation-with-the-colour-checker-lut-module/
?
"to interact with the colour mapping, you can change both source and
target colours. the main use case is to change the target colours
however, and start with an appropriate palette"
However, I want to do the opposite. I want to start with an appopriate
target palette (the xrite color checker card) and then pick the source
colors from the picture.
By selecting different areas and shift-clicking the corresponding
patches in the palette I get to alter the image, but then there seems to
be no way to tell it what values those patches should have. I'd have to
adjust the 4 sliders, but that's impossible to get right. (At least in a
reasonable time.) I should be able to just choose the target colors from
a drop-down, or maybe be able to switch between the source palette and
target palette. (It's ok for me if the target palette is difficult to
set up, that's something I'd do only once, and the default one looks
just like the xrite color checker anyway, so maybe that would work as such.)
And I specifically don't want to create any custom profile (I could have
5 different lighting setups per photoshoot, so after 40 photoshoots I'd
be handling 200 profiles, which isn't manageable), I just want to use it
to apply the white balance.
i'd recommend using more than the 24 patches to create a really useful
color lut. as opposed to white balance or an icc profile with a
matrix, you'd get weird artifacts/overshoots from the interpolation of
very sparse patches. in fact i'm thinking we should extend the
profiling tool to support multiple it8 targets as input, with
different exposures, to sample the gamut even better.
other than that, sure, that'll potentially make your white balance more precise.
Those 24 patches should still make for a more accurate white balance
than having only 1 patch, like the current white balance does, right?
Even if I'd be lazy and use only a subset of those 24 patches; say, 6
patches.
Cheers,
Marcus
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