Color-Mapped Imaging

Abstract

SynonymsColor palette imaging;Pseudo-color image processing;Color quantizationDefinitionImaging process devoted to work with images that store the color information of each pixel in a color table (palette).Brief Introduction and TerminologyA color-mapped image or indexed image manages the color information by maintaining a table with a limited number of colors [1,2]. The information stored in each pixel is the relative index to a color in that table (Fig. 1). Using indexed colors usually greatly reduces size of image files (as each pixel uses only a few bits to refer to a space in the color table, rather than many bits to refer to subtle hues). Unfortunately, it can also result in very large file sizes for photographs or images with many subtle color shades.Color-Mapped Imaging. Figure 1.Example of color-mapped image.The pixels in the image I with m rows, n columns, and M distinct colors can be represented as I(x,y) = P(I’(x,y)), wher ...