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The photo below has a distinct patch of purplish colour, in the area within the yellow oval. It's a shame because I like the picture. I think it must have been caused by low morning sunlight catching the lens.

What would be a good way to remove it? I think it's only really visible on the bronze frog, so basically, I want to apply the rule "if you see this purplish hue in this region, shift it towards this correct colour".

Or something like that, I am not so familiar with these operations.

I have Pixelmator Pro and Photos for macOS at my disposal; I don't think that the latter's going to help much though.

How would you try to correct this?

photo with colour-cast

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The difficult part is selecting the area you want to correct. I don't know your software, but in Photoshop here is how I would do it:

Set the magic wand tolerence to about 10. Repeatedly select using shift-click to add more to the selection. Do this until you have roughly selected the area.

enter image description here

Feather the selection so you don't have sharp edges that will be noticable after the next operation. I used about 30 pixels.

Use the color balance tool: less blue, less red, more green.

enter image description here

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  • \$\begingroup\$ Thanks, I did this - I am sure someone more expert could get better results, but it's a great improvement. \$\endgroup\$ Commented Dec 27, 2022 at 19:05
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This is probably best done with a brush tool. Sample the color of the surrounding statue, set the brush to Color mode and brush over the discolored area.

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  • \$\begingroup\$ This is by far the better method. You can even let the brush be less than 100% strength just to leave little colour hints in some places. Here's a quick attempt, leaving some hints in & also pushing clarity/contrast which I think helps too - i.sstatic.net/mdJUP.jpg \$\endgroup\$
    – Tetsujin
    Commented Dec 29, 2022 at 19:30

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