Some bitmap images will be like an old black-and-white television image, and we call those grayscale. When you load a grayscale image, the chances are good that the image will have lines that look nice and clean, but are really all sorts of gray variations, like a pencil drawing. Grayscale images are fine to work over, but if you plan to use a magic wand line input you may want to save the image as a Black and White (1-bit) image, if you have an image-editing program such as Paint.