I've always wondered how come changing resolution(dpi) increases rendering time if the size in pixels remains the same? If monitors and TVscreens use pixels for measuring sizes and resolution is mainly used for printing then why do they (monitors and screens) have a resolution of 72 dpi? 3000 x 2745 pixels at 300 dpi equals to 10" x 9.15" like you thought, Shonner. It doesn't matter what resolution you use while rendering. Printing at 150 dpi creates still quite sharp images if you want to get fairly good big prints with less rendering time. You are lucky to use inches in everyday life, we use the metric system here and I must always do more calculating when printing images because every program shows resolutions as dpi.