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fixing corruupt histogram data

Apr 28, 2011, 15:24
Post: #1
fixing corruupt histogram data
Hi everyone. I'm pretty sure that there is an easy fix for this, but here's my problem:

I have a nice image that has lost the red channel histogram data for about half of the image. It can still be viewed, and the preview is correct.

How do I fix this? Can I copy the histogram data from the red channel of the non-corrupt portion of the image? I know it's the red channel because when I open the color data from the corrupted portion the red channel is literally non-existant.

Ideas here?
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Apr 28, 2011, 19:11
Post: #2
RE: fixing corruupt histogram data
Looks like a corrupt JPEG.

The histogram is a statistic over the picture, it tells you how many pixels are red (and how red) but ot doesn't tell you where they are, so you can't really copy the histogram from the top over the bottom.

However, if you have a thumbnail in the image that has got the colors, miracles can happen. There is a way to recover the colors from the thumbnail and rebuild a rather good image. So see if the image displays in full colors in a thumbnail in some photo software, or post it here.

Now answering your questions on
https://Gimp-Forum.net
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