Doug,
Thank you for the explanation. Now to think of it, indeed, glare in
transmissive mode is completely different from what this utility addresses and
there is hardly any significant color contamination in addition to the
lens-like glare you pointed out. Thanks for setting me straight!
Cheers,
Nic Nilov.
On May 12, 2022, at 01:15, Martin Gray <mdgray@xxxxxxx> wrote:
Nic,
Glare in transmissive media is a far smaller problem (order of magnitude)
than scanning reflective media. I don’t think my utility or approach would be
useful. Further, the glare is caused by different mechanisms. Probably closer
to camera lens glare. Thus one would have to model glare sources from the
entire image rather than a narrow ( a few cm’s at most) region around points
in the reflective media. Extremely difficult to characterize.
Doug
From: argyllcms-bounce@xxxxxxxxxxxxx <argyllcms-bounce@xxxxxxxxxxxxx> On
Behalf Of Nic Nilov
Sent: Wednesday, May 11, 2022 2:38 PM
To: argyllcms@xxxxxxxxxxxxx
Subject: [argyllcms] Re: Scanner utility that significantly improves
colorimetric accuracy
Hello,
While reading through this list's archives I stumbled upon a two year old
post
(https://www.freelists.org/post/argyllcms/Scanner-utility-that-significantly-improves-colorimetric-accuracy
<https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.freelists.org%2Fpost%2Fargyllcms%2FScanner-utility-that-significantly-improves-colorimetric-accuracy&data=05%7C01%7C%7C87fd0ecc5ded4719b93508da33969a2c%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637879019180689742%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=xorl8eKs4smOxPZs4Iwvzynbc59VMR%2FcLJue9zNuq78%3D&reserved=0>)
about a utility for removing the scanner glare for reflective media. Not
sure if the author is around, but I wonder whether this utility can also be
used (and whether it is relevant) for transmissive media. While the likely
answer to both questions is yes, an obvious obstacle is the creation of a
calibration transparency
(https://github.com/doug3236/scanner_refl_fix#initially-calibrating-the-scanner
<https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fdoug3236%2Fscanner_refl_fix%23initially-calibrating-the-scanner&data=05%7C01%7C%7C87fd0ecc5ded4719b93508da33969a2c%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637879019180689742%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=2VxsIgMzASR%2FcaCtmLazD3tJWXXBOHeV1y6RnbtBFJU%3D&reserved=0>),
which seems doable though.
I wonder if any attempts were made in that direction by anyone.
Cheers,
Nic Nilov.
