Thanks everyone for your inputs. I'm getting a better grasp on this topic. From the replies you gave PDF seems like the best file type. But because the printing company I'm using is the most cost effective at the moment, then I'm limited to certain file type for now. I will offer my customers different size ratios where possible. If I chose to produce my art in the highest size for a particular ratio, saving at 300dpi in either jpeg/png, then could that file be downsized to the smaller sizes, while retaining quality? Below are the ranges I was going to offer (bolded being the size I'd produce art as) : 2:3 - Inch: 4x6, 6x9, 8x12, 10x15, 12x18, 16x24, 20x30, 24x36 4:5 - Inch: 4x5, 8x10, 11x14, 12x15, 16x20 3:4 - Inch: 6x8, 9x12, 12x16, 15x20, 18x24, 24x32 A1 adjusted to A2, A3, A4 I'm thinking that I could save in the bolded sizes and the customer (if this was a downloadable file) could take to a printing service and get a smaller inch size if needed? Or I could use the saved file when sending to my printing company and offer the smaller size ranges related the ratios above. Chris
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