https://bugs.kde.org/show_bug.cgi?id=444211
Bug ID: 444211
Summary: Auto "contrast" feature for Thumbnails and Preview ?
Product: digikam
Version: 7.4.0
Platform: Other
OS: Other
Status: REPORTED
Severity: wishlist
Priority: NOR
Component: Thumbs-Image
Assignee: digikam-bugs-n...@kde.org
Reporter: basilr...@gmail.com
Target Milestone: ---
Created attachment 142738
--> https://bugs.kde.org/attachment.cgi?id=142738&action=edit
astroimagej and irfanview screenshots
It would be very nice to have a setting that can automatically adjust
"contrast" when viewing Thumbnails and Previews. This would be Very helpful
when browsing through my astronomy .FITS files, and probably "normal" images
also. For astro images the "data" in the image is in a very narrow range of the
image histogram and when browsing, digiKam Thumbnails or Preview there is never
enough contrast. What I'm suggesting is something like the Color
Auto-Correction feature in the Image Editor.
Many astronomy programs have a feature when they display image (thumbnail,
etc.) it bases the low/high (black/white points) on the mean image value +/- a
certain fraction of the standard deviation of the image (follow me?)
For example a 16bit image has a mean value of 16,760 and a standard deviation
of 1434. The program (in this case AstroImagej - see attached file) will set
the low/black point at 16,760 - (0.5 * 1434) = 16,043 and the high/white point
at 16,760 + (2 * 1434) = 19,628. This gives excellent contrast to see the
"data".
Some basic image browsers have a similar feature where you can force the Gamma
to a certain value, but this doesn't always work very well. See the IrfanView
screen grab attached.
Hope this was clear, sorry for the lengthy post.
Many thanks again!
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