I found the PR on github and the changes in the C code. Can anybody
point me in the direction how I can test these? Do I have to compile
something? This is probably a very general question and I don't want to
pollute this thread with it, so a link to further information would be
sufficient. I just have trouble finding this kind of information even
after spending some time googling.
Best wishes,
Christian
Am 12.01.19 um 17:42 schrieb johannes hanika:
thanks for this! it works fine on my machine.
the conversion is done in lcms2, right? they do support unbounded
transforms now. if we're not clipping to [0,1] the colour space should
not matter at all. i'm not sure i understand the difference between
icclab and cielab. but if we could just keep it in lab (cie, d50), we
would need to select lab as input colour profile, too. this will
result in disabling the colorin module and thus faster processing by
handing down the buffer that is already lab.
cheers,
jo
On Sun, Jan 13, 2019 at 4:38 AM Ulrich Pegelow
<[email protected]> wrote:
There is now a PR in github that makes darktable read LAB Tiff files
(PR1996). Please give it a try.
FYI, the Tiff file gets internally converted to sRGB when opened. sRGB
represents a much smaller gamut than Lab. Please check if this gives
problems like much too low color dynamics. A larger gamut like AdobeRGB
could be an option in this case but would require a bit more work.
Ulrich
Am 09.01.19 um 15:22 schrieb Christian Stromberg:
With the latest update that includes the new spot healing tool,
darktable is now a serious choice for scanner operators as well.
However, it still fails to correctly interpret 16bit TIFF files in LAB
color space that are output by Heidelberg's scanner software Newcolor.
This software supports Heidelberg's high-end flatbed and drum scanners
that are still in use worldwide in considerable numbers and its output
in LAB color space allows for the most flexible editing of the scans.
Photoshop and Lightroom do read it correctly while darktable screws up
the colors, making everything look neon colored, which btw. is also the
case for many other tools. I still haven't found out what the cause is.
What would be needed to get that fixed? Does it make sense to upload
such a TIFF file to rawpixls?
Best wishes,
Christian
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