300 CHAPTER 8 COLOR MANIPULATION, CHANNELS, (Web design company) AND
300 CHAPTER 8 COLOR MANIPULATION, CHANNELS, AND LAYER MODES Color Depth Digital images have another property: depth, or how many different shades of each color the video system can display. You will sometimes see color depth abbreviated as bpp, bits per pixel. You may hear the phrase bits per channel, the number of bits used per color in each pixel. Multiply by three (for the three primary colors) to get bits per pixel or sometimes by four if the image has transparency. Many early color computers could display only 256 colors this is 28, the largest number that can be expressed in eight bits, and hence this was sometimes referred to as eight-bit color. Later, computers were introduced that could display 16-bit color, or 65,536 (216) colors. Today, most computers can display 24-bit color: eight bits per color channel, or 16,777,216 different colors. This is sometimes called true color. Figure 8-2 compares these three color depths. Figure 8-2. 24-bit, 8-bit, and 16-bit color Modern computers most often use 32 bits to represent a pixel. Generally, 32-bit color has the same number of colors as 24-bit color. The extra eight bits may be used to represent transparency (as the GIMP does), or it may not be used for anything at all.
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