I figured out how to change the default unit of measurment from px to cm for a new image, but how do I do the same for an image I've copied from the net and pasted into gimp as new image (Ctrl, Shft + V)? When I go to resize for this, it's still in px?
This bears directly on your other post. Copy and paste directly probably not the same resolution as your image, However.
Gimp is a bitmap editor, it works in pixels not inches or centimetres. If you copy and paste into Gimp then look at
Image -> Image Properties where it gives the size in pixels (1) and the resolution in pixels-per-inch (ppi) (2). Of course you can change the scale in the rulers (3) but that in no way changes the image size in pixels.
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attachment=6579]
Pixels divided by resolution gives a print size. The example 330 / 96 = 3.43 400 / 96 = 4.16 A print size 3.43" x 4.16" if inches are your preference. Ofnuts has a page about it here:
https://www.gimp-forum.net/Thread-Image-size-in-Gimp
That is fine for a copy - paste on its own. Be aware if you paste into
another image with a different ppi and many Gimp templates are 300 ppi then the pasted image will appear much smaller, this example 1.1" x 1.33" although the size in pixels is still the same.