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the dots are the same color Therefore, rather than storing, say, a hundred red dots, you store one red dot and a count of 100 This reduces the amount of information from 100 pieces to 3 pieces (a marker indicating a run of similar colored dots, the color, and the count) or even 2 pieces (if all information is stored as pairs of color and count) (Figure 31) This is called run-length compression It is a form of lossless compression, meaning that the original picture can be reconstructed perfectly with no missing detail Run-length compression is great for simple pictures and computer data but does not reduce a large, detailed picture enough for most purposes DVD-Video uses run-length compression for subpictures, which contain captions and simple graphic overlays The legibility of subtitles is critical, so it is important that no detail be lost DVD limits subpictures to four colors at a time, so there are lots of repeating runs of colors, making them perfect candidates for run-length compression Compressed subpicture data makes up less than one-half of 1 percent of a typical DVD-Video program In order to reduce picture information even more, lossy compression is required In this case, information is removed permanently The trick is to remove detail that will not be noticed Many such compression techniques, known as psychovisual encoding systems, take advantage of a number of aspects of the human visual system 1 The eye is more sensitive to changes in brightness than in color 2 The eye is unable to perceive brightness levels above or below certain thresholds 3 The eye cannot distinguish minor changes in brightness or color This perception is not linear In other words, certain ranges of brightness or color are more important visually than others For example, variegated shades of green such as leaves and plants in a forest are more easily discriminated than various shades of dark blue such as in the depths of a swimming pool 4 Gentle gradations of brightness or color (such as a sunset blending gradually into a blue sky) are more important to the eye and more readily perceived than abrupt changes (such as pinstriped suits or confetti).

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The code here is [SNRO] To set the buffer of SD documents, enter the object name, RV_BELEG, and select Change, as shown in Figure 5-23 Proceed by selecting Edit, Set up buffering, Main memory (see Figure 5-24)

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The human retina has three types of color photoreceptor cells, called cones3 Each is sensitive to different wavelengths of light that roughly correspond to the colors red, green, and blue Because the eye perceives color as a combination of these three stimuli, any color can be described as a combination of these primary colors4 Televisions work by using three electron beams to cause different phosphors on the face of the television tube to emit red, green, or blue light, abbreviated to RGB Television cameras record images in RGB format, and computers generally store images in RGB format RGB values are a combination of brightness and color Each triplet of numbers represents the intensity of each primary color As just noted, however, the eye is more sensitive to brightness than to color Therefore, if the RGB values are separated into a brightness component and a color component, the color information can be more heavily compressed The brightness information is called luminance and is often denoted as Y5 Luminance is essentially what you see when you watch a black-and-white TV Luminance is the range of intensity from 0 percent (black) through 50 percent (gray) to 100 percent (white) A logical assumption is that each RGB value would contribute one-third of the intensity information, but the eye is most sensitive to green, less sensitive to red, and least sensitive to blue, so a uniform average would yield a yellowish green image instead of a gray image6 Consequently, it is necessary to use a weighted sum corresponding to the spec-

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