Be aware that the term “bitmap” can have two different meanings. It can be used as a synonym for raster (“That is not vector artwork; it's a bitmap image.”). In this usage, it refers to an image consisting of pixels arranged in rows and columns. When talking about color, “bitmap” refers to black-and-white images. In Bitmap color mode (also called 1-bit color), each pixel is either black or white. There are no shades of gray or other colors.