Bitmapped images, also called raster images, are made of pixels. Pixels are tiny dots of solid color that make up what you see on your computer screen. Most computer monitors display approximately 70 to 100 pixels per inch -- the actual number depends on your monitor and screen settings. Your printer needs much more image data than a monitor. In order to render a bitmap image accurately, the typical desktop printer needs 150-300 ppi(pixels per inch). Best results can be achieved with 300 dpi (dots per inch) images. All scanned images are bitmaps, and all images from digital cameras are bitmaps. Common bitmap formats include bmp, jpg, tiff, gif, png, and psd.