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There are a variety of actions to resize or crop an image either in the system clipboard, or in a Named Clipboard.
You can:
Resize an Image, scaling it to specified dimensions.
Resize an Image to Fit, scaling it to fit within specified dimensions.
Resize the Canvas, with the (possibly cropped) image left in the center of the new canvas.
Add Margins to an Image, adding (or removing) a margin to each edge of an image.
Crop an Image, selecting a particular section of the image.
Set Image DPI, set the effective DPI of the image (the pixels are unchanged).
Note that the actions refer to image pixels, irrespective of the DPI of the image.