You can use the restore filter.

Go to www.gimpusers.com/news/00237-exeptional-plugin-photo-restore

there you find the instructions to download and instal the filter. It works almost very fine.

Good luck with it.

Simon.

Op 29-07-15 om 20:59 schreef John Broyles:

I recently converted some old slides to digital pictures. Unfortunately some of the older slides have developed a pink tint, probably from age. Can I remove this tint in the digital pictures using Gimp? I looked at color level but could not understand whether this would solve my problem or not.

Thanks,

John _______________________________________________ gimp-user-list mailing list
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On 07/30/2015 04:46 AM, s.kortenweg wrote:

You can use the restore filter.

Go to www.gimpusers.com/news/00237-exeptional-plugin-photo-restore

there you find the instructions to download and instal the filter. It works almost very fine.

Well heck. That filter looks amazing, but on the first try here it failed in a major way: First it threw error messages and appeared to exit, then it ate so much CPU and memory that I had to reboot the machine to get rid of it. I am using GIMP 2.8.10 on Linux Mint 17, AMD 64. Apparently the plugin was written for GIMP 2.6, and an earlier version of Python than I have installed, so for now I will blame the problem on compatibility issues with GIMP and/or Python.

What I usually do to remove tints from images is:

1) Open the image and use the eyedropper to pick a sample of the color I want to suppress.

2) Open the color selection dialog and set the picked color to maximum saturation/value.

3) Make a new empty layer, fill it with the color in question and set its mode to Color.

4) Do Colors > Invert, to obtain a color that can cancel out the unwanted tint.

5) Set the transparency of the new layer to a low value, < 10%, and adjust until the best looking results are found.

6) Create a "new layer from visible" twice, set the mode of the new top layer to Overlay, and adjust its transparency until the best looking results are found.

That last step restores a lot of lost contrast and saturation to the image. Before this is done, the results look "foggy" because adding the color from the layer to the tinted layer below it replaces the unwanted color with unwanted gray. Increasing the contrast of the overlay layer may also be useful.

Results of this process are usually not as good as in the examples of the restore.py plugin's results, but so far I don't have a better way. Any suggestions?

:o)

Steve

On Wed, 29 Jul 2015 18:59:40 +0000 John Broyles wrote:

I recently converted some old slides to digital pictures. Unfortunately some of the older slides have developed a pink tint, probably from age. Can I remove this tint in the digital pictures using Gimp? I looked at color level but could not understand whether this would solve my problem or not.

Two fairly easy ways -

(1) use Colour/Colour Balance (2) use Colour/Curves to raise green and blue

You can get a start on (2) with Colours->Levels and pressing auto; unfortunately this may lose a small amount of detail in highlights and shadows, but if before pressing OK you click on Edit in Curves (the exact labels and menu names may vary depending on your language and locale of course) you can move the curves slightly. For many applications levels/auto works magic.

Liam

Thanks,

John
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Liam Quin - XML Activity Lead, W3C, http://www.w3.org/People/Quin/
Pictures from old books: http://fromoldbooks.org/

On Thu, Jul 30, 2015, at 12:34 PM, Liam R E Quin wrote:

On Wed, 29 Jul 2015 18:59:40 +0000 John Broyles wrote:

I recently converted some old slides to digital pictures. Unfortunately some of the older slides have developed a pink tint, probably from age. Can I remove this tint in the digital pictures using Gimp? I looked at color level but could not understand whether this would solve my problem or not.

Two fairly easy ways -

(1) use Colour/Colour Balance (2) use Colour/Curves to raise green and blue

You can get a start on (2) with Colours->Levels and pressing auto; unfortunately this may lose a small amount of detail in highlights and shadows, but if before pressing OK you click on Edit in Curves (the exact labels and menu names may vary depending on your language and locale of course) you can move the curves slightly. For many applications levels/auto works magic.

Liam

Thanks,

John
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akovia

This is what I use and get great results.
https://www.youtube.com/watch?v=gr692iyYBUI