300x300Pixel printed with 300dpi = printed picture 1x1 inch 300x300Pixel printed with 100dpi = printed picture 3x3 inch 600x600Pixel printed with 300dpi = printed picture 2x2 inch 600x600Pixel printed with 100dpi = printed picture 6x6 inch The important thing is, the needed printquality. If someone wants a picture, 12x12inch printed with 300dpi, you have to increase or decrease your image resolution to 3600x3600Pixel (+ some additional pixels for papercut if it,s for a cover or something like that) Robert