Every once in a while I need to select a cutout from a photo using The GIMP. Often the size of the cutout is predefined. What are you doing to ensure you select the right part of the image? You guess how big the selection has to be to accommodate the predefined size and do a free-hand rectangle selection, right? Wrong. Fixed size rectangle selections to the rescue!
Use the rectangle selection tool. In the Size Constraint Option Menu for the tool choose Fixed size and give width and hight in pixels. You can now press your Alt and Shift keys to only move the marching ants-like border of the selection and select the best part of the image for the cutout.
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