35 x 45 mm is the standard photo frame for a long list of visa and identity forms, Canada's temporary resident visa among them. The trap is that millimetres are useless to an image editor until you convert them, and the conversion depends on the print resolution you are aiming for. At 300 dpi, 35 mm is about 413 pixels wide and 45 mm about 531 pixels tall, which gives the 413 x 531 file most print shops and photo booths work in. At 600 dpi it doubles to roughly 827 x 1063. Pick the dpi your printer asks for, resize to those pixels, and the millimetre frame follows automatically — that is the whole trick. The second half of the job is the head size inside the frame, which is a spec of its own: Canada asks for 31 to 36 mm from chin to crown, so the head should occupy roughly two thirds of the 45 mm height. Resizing does not fix a wrong head proportion; it only delivers the frame cleanly. Skwish resizes to exact pixel dimensions with aspect ratio preserved or forced, compresses to a KB target in the same pass, and reports per-file before and after sizes. Cropping and framing stay yours to judge against the form's own guidance.