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Portable Network Graphic  |  1990-09-25  |  51.1 KB  |  552x711  |  4-bit (16 colors)
   ocr: Dithering of 32- and 16-bit images to lover color resoltions-1,2,4,and 8 Color dithering is sim: ilar to creating a color that looks like orange by placing red and yellow pixels close together. If the display is limited to a certain number of colors, the Macintosh can take images rich in color intormation and produce a close match at lower color resolutions, giving the appearance of: more color by combining the limi ited number of colors in an eftective mammer. GrayHevel representation with luminosity In grayscale mode, QuickDraw will map a color to its nearest luminance value or lightness. Th ...