[Digikam-devel] [Bug 179413] Support restoring blown out highlights

[Dik Takken]

http://bugs.kde.org/show_bug.cgi?id=179413





--- Comment #4 from Dik Takken <d h j takken xs4all nl>  2009-01-03 13:05:54 ---
Hmm... Well, I never tried it on 8-bit JPEG images but I can't think of any
technical reason why it shouldn't work.. The technique is targetted at pixels
that have one or two channels clipped. This problem exists in many images, not
only  RAW images. That is why I think it would be a good thing to allow the
user to apply highlight restoration to any image.

Another reason why DigiKam should do highlight restoration on any image: When
the user processes images in DigiKam, pixel values can clip without the user
noticing it. Sure, DigiKam can show clipped pixels in the image. But DigiKam
only shows pixels that have all three channels clipped. Pixels with only one
channel clipped do not show up. Because DigiKam can easily clip pixels without
warning, there should be a means to fix the damage caused by image processing.

One more thing: There are more 16-bit image formats besides RAW images. Think
of TIFF files. Currently, DigiKam does not allow the user to restore the
highlights of these files.


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