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Color matching photographs

Jun 10, 2011, 13:17
Post: #1
Color matching photographs
Good morning fellow gimpers! I have tried unsuccessfully to figure out how to color match in GIMP. I found a tutorial for photoshop, but for whatever reason I cannot translate it to GIMP. Tutorial is here: http://www.photoshopessentials.com/photo...age-2.php.

I am designing wedding invites for my sister's wedding, and want to match the color of her preferred flower to the flower bunch I'm placing on her invite.
This is the bunch I'm using:
[Image: originalorchid.jpg]
This is the color I need to apply to the bunch I'm using:
[Image: otherorchids.jpg]

Any help would be most appreciated - even if it is a different, possibly simpler way of achieving my intended results!!
Thank you!
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Jun 10, 2011, 14:36 (This post was last modified: Jun 10, 2011 14:37 by ofnuts.)
Post: #2
RE: Color matching photographs
Crude but rather efficient: use the color picker (with some average sampling) to set the foreground color to the color your want. Set the paint brush to "color" mode and paint over your target (this won't transfer the "lightness" component, so you keep all the detail). You can adjust the luminosity of the target beforehand (with Levels, for instance) so that the painting over produces an even closer color (some trial and error may be required).

Explanation: besides RGB, colors can be represented as Hue, Saturation and Value (aka HSV), where value is pretty much the black and white image where all the detail is. When painting in Color mode, you transfer H&S but keep V.

With the Pointer Information dialog, you can explore your source image and display H,S,V for the pixels, so you can adjust the target image for an identical average V on the petals, so the paint over will produce the very same HSV. You can also use the Histogram dialog and select parts of the petals in both pictures and adjust the lightness of the target until you get reasonable close histograms.

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Jun 10, 2011, 14:46
Post: #3
RE: Color matching photographs
Thank you for your response! Do you suggest doing the painting in separate layers or no?
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Jun 10, 2011, 18:03
Post: #4
RE: Color matching photographs
You have to paint on the original layer (or on a copy), because the "V" component has to be there already.

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Jun 10, 2011, 19:40
Post: #5
RE: Color matching photographs
I cannot thank you enough - this has worked fantastically!
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Jun 10, 2011, 21:58
Post: #6
RE: Color matching photographs
My pleasure... can you share the result with us?

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