Hello, I use Photoshop CS3. My original files are PSD files in 9000x6000, 300dpi, 20x30" files that I "save as" JPGs for photo processors (MPix, MyPhotopipe, for instance) I want to print these files in their current ratio (3:2) on 20x30, 16x20 and 12x16 sheets which will result in having a white, unprinted, trim as follows: (A) 20x30 sheet with a 18x27 centered image (B) 16x20 sheet with a 12x18 centered image (C) 12x16 sheet with a 10x15 centered image OK, here is my problem. I cannot figure out the formula / ratio where I can ADD, with the "Canvas Size" tool, a white trim around the existing 20x30 PSD file without having to resize the image. For example, what CANVAS SIZE would I have to add to a file that is already 20x30 which will result in an image that is a perfect fit into the "(B)" sheet? (Same question for the 12x16 and the 20x30 sheets (A) and (C).) I am sure i am doing a poor job describing my question. So, let's use (B) as an example. Ordinarily, I would take my 20x30 PSD file and resize the image to 12x18 then ADD a 16x20 white background canvas to the image. However, I feel that this reduces the quality of the image (because I reduced the size). So, how can I keep my original 20x30 file? What canvas size would i have to make to come up with the (B) description? How did you go about this? What simple formula did you use? I am sure, once i get it, i could apply the same technique to every ratio. well, thank you for your help.