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I made really stupid mistake and during today cultural event, I forgot to switch white balance from "warm light" (light bulbs) to sunny (or at least auto). As result, some photos have cold colors as you can see. Sadly, I was doing JPEGs and Corel Aftershot 3 blocks manual setting of temperature in non-RAW files.
How can I save those photos? Is there any open software stuff that would let me do that?