How should I remove a patch of colour-cast?

Question

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?

Answer 1

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.

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.

Answer 2

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.