If your PI 7 doesn’t let you set mm/inch in the crop tool, just crop a square, then use Image → Resize to set the exact dimensions (e.g., 600×600 pixels for a 2×2 inch photo at 300 DPI).
PI 7 is still a reliable workhorse. Fire it up, follow these steps, and you’ll have studio-quality ID photos from your desk. pi 7 passport size photo maker