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That is a whole another chapter to explain how to correct skew, aspect ratio, or keystone/perspective distortions.
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HA! Garth, now you are going to need to spend even greater amounts of time to teach me this!
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Beth if you can find a shortcut that does not use the calculator step, by all means share it with us! I know that one can change the scale of the overlay layer in EDIT/TRANSFORM/SCALE, but I have not seen how it is possible to constrain proportions in the process.
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I must qualify the fact that I have no idea if this is correct, but it is what I do. Instead of all the calculations, you just make sure the two images you will be working with are the same resolution - dpi, before you paste one into the other, then just use the transform/scale feature.
Another trick is to take your reference and do a "path" out line of what you need to highlight, save the path. Then open your file of the painting and with them both open - just drag the saved path from the reference on top of the painting file and it will be saved there too. With the path tool selected (the pen or arrow just above) you will have an option to use the transform path/scale feature. Scale your path as needed and whammo, there's the mistakes or perhaps the perfection you were hoping for!