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Hi Lachlan,
Do you have Photoshop? - it's easy to fix.
If you split the channels you'll see that the
blotchy areas are in the Red channel.
Go back to your original picture.
Make a new layer.
Control M will give you curves.
Click on the Red channel.
Sample the dark areas of the blotchyness.
You'll see they are at about 38 bits out of 255.
The brighter Red areas are at around 52 bits.
Adjust the curves to boost the areas around 38 up to about 42.
Adjust the areas that are around 52 down to about 48.
Fix up the other areas that have now moved in the curves
so that they line up with the original curves.
You only want to adjust the areas mentioned.
It's now adjusted - so
select the opacity to change the strength of the changes to your liking.
cheers
Allan
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