by ʇolɐǝz ǝɥʇ qoq

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Let's say I've accidentally shot my pictures on "sunny" white balace when I should have used "shade". What is the easiest way to warm the pictures up a bit in Gimp? The "Colors/Color balance" tool does not really cut it, as I don't want to mess with three sliders for three brightness levels.

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Related, but no Gimp answers: How do I correct white balance in JPEG images? – mattdm Oct 3 '11 at 19:48
up vote 12 down vote accepted

The quickest GIMP tool I'm aware of is the color levels tool. Near the bottom of the tool is 4 buttons: Auto, black point, gray point, and white point. You can use the auto (iffy, but it may get it right or close for minor adjustment) or use the white point button to select the white point in the image.

It is, by the way, the same technique I suggested for Photoshop in the first link @mattdm supplied.

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This works for making WB neutral, but what I was hoping for was a tool that would allow me to apply equivalent of (let's say) 1/4 CTO filter. Like a slider with full CTO to neutral to full CTB scale. I guess I'll have to create presets... – che Oct 5 '11 at 19:41
@che - You may want to consider some preset overlays in the various filter colors that you can then tweak the opacity on as you need. Just a thought, it's very similar to how photoshop does these filter sets. – John Cavan Oct 5 '11 at 21:19
I got "CTO" and "CTB" gel colors from Rosco's site (252,183,114 and 53,157,218 in RGB colors, if anyone's interested) and this seems to work quite well. Thank you! – che Oct 8 '11 at 19:44
Awesome! Happy to have helped! – John Cavan Oct 8 '11 at 22:30

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