4. Preparing Raster Images
Whether you acquire an image from a scanner, a digital camera, a royalty-free CD with 1,000,000 images, or a stock photography vendor, it’s made out of pixels. Pixel is shorthand for picture element, the smallest unit of information in a digitized image. Even though pictures on your monitor look like smooth transitions of color, zoom in sufficiently and you’ll see all the little square pixels that actually make up the image (Figure 4.1). While pixels make it possible to do much of what we do in the graphic arts, they’re also the cause of some important limitations.