Using GIMP editor for Microsoft Windows. I have scanned an image and need to prepare the file for printing and the print file size/dimensions should be 88.5 x 57 mm: How can I set a rectangular selection to these dimensions and trim the image?
- Convert your physical size to pixels using your target resolution.
In the options of the Rectangle Select tool, check Fixed select Size and enter the result from the previous step:
Click on the actual document to position your selection as desired.
- Image → Crop to Selection.
If you do not have your target resolution, you can fix the aspect ratio in step 2 instead.