Do you mean by size? If so in Potoshop go to File – new and set it to height 45mm width 35mm hit OK then open the image that you want to use, drag and drop it into the new document, delete original, go to edit – transform – scale and holding down the shift key drag the corners of the image in to fit, then hit enter. Then drag your finished images onto another new document perhaps sized to A4, flatten the layers and print on an appropriate paper. Or alternatively send the image(s) to an online printer.