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It's actually fairly easy.
Open the image in photoshop. Make sure the image is flattened (layer flatten image).
Open the brush tool. Choose a brush size (top menu) about the size of the spots. (smaller will give a better result but it takes longer).
Move the cursor to an area next to the spot you want to remove, where the color matches the color you want the spot area to be.
Then "alt" "click" - this selects the brush color. Then click on the spot 2 or 3 times (or hold it down) until you are happy with the color match.
Do this to all the spots.
You can use this to remove blemishes in non-astro photos too.
Regards,
Tony.
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