If you have paintshop pro 8. You can select the crop tool, set the size to 3.5 x 4.5 cm.when the box appears pressing shift and dragging a corner handle of the (crop)box to maintain the aspect ratio to a size that will cover your selection, drag the box over your selection and double click, this will give you the desired picture but wrong dimensions. to get the right dimensions click on image on the top menu bar and resize the image to 3.5 x 4.5 cm. Just tried it and it worked ok for me. hope this helps
Sorry Can't help you there never was good with the maths technology, but if the quality of the picture is good ie pixel per inch should be ok, is there a resampling option on the menu bar that will give you a lead? I think when they refer to 800 dpi that may be the print quality that you can set in your printer settings ie best quality.
Hi again, I also have Photosuite - in Photosuite insert your pic after going to Compose>Collages>BlankCanvas - you will then get options to set to 800dpi. You can practice with different sizes to get passport size. The resize option is in the drop-down menu under Adjust. Set it up as a collage and you can also copy pic (within collage) to be able to print 4x passport pics at one go. Save your resultant 'collage' as jpeg, ready to print. Cheers.