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I have three camera cards: white, 18% gray, and black. These are used to fix the colors of the photos that are taken. I took a picture with all three of these cards at the beginning of the shoot.

My question is: How can I get GIMP to correct the color of the photos based on these cards? Also, how can I apply the transformation to the photos after the one that contains the cards?

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up vote 5 down vote accepted

Here's how you do this:

  • Load the image with the color cards.
  • Go to Image » Color Tools » Levels
  • Use the color pickers to choose the cards
  • Create a name of the color profile and save it from the Levels dialog
  • See how badly your camera picks out colors.

When you have the other photos open, just select the saved profile from the Levels dialog.

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