Compression for Great Digital Video: Power Tips, Techniques, by Ben Waggoner

By Ben Waggoner

Compression for excellent electronic Video is an important reference for encoding electronic video and audio for the net, CDROM, DVD, and different media. electronic video pros in achieving greater and quicker effects by way of studying every thing that occurs earlier than compression (shooting, enhancing, and shooting) and after compression (getting records at the server, getting trustworthy bandwidth, and end-user configuration). This ebook offers an excellent beginning within the basics of sunshine, imaginative and prescient, and compression know-how appropriate to any compression software program. It additionally teaches tips on how to use the most well-liked functions to optimize documents for max caliber, potency, and manageability. Compression for excellent electronic Videoshows readers find out how to in attaining greater effects faster whilst encoding electronic video and audio for the internet, CD-ROM, DVD, and different media.

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This can yield surprisingly good results, but makes files that are very hard to compress. Alternatively, the color can be flattened—each color is just set to the nearest color in the 8bit palette without any dithering. This looks worse for photographs, but better for synthetic images such as screen shots. Not dithering also improves video quality. Many formats can support indexed colors at lower bit depths, like 4-color (2-bit) or 16-color (4bit). These operate in the same way except with fewer colors.

Org Web site when I’m printing out “Bob the Builder” coloring paper for my two-year-old son. 8-bit color (indexed color) 8-bit is unique among color depths in that it doesn’t use its eight bits to define a value for each of a pixel’s three channels. Rather, the bits are used to define 256 discrete 24-bit RGB colors. The selection of discrete colors is called a palette, CLUT (Color Look Up Table), or index; thus 8-bit color is often called indexed color. 8-bit is never used in video production, and it is becoming increasingly rare for it to be used on computers either.

However, cosines are typically much simpler for expressing real-world information. A simple cosine would be very easy to encode, since a single coefficient would do the job. More complex images are more difficult to compress, because they require more coefficients. 13 This grayscale 8×8 block is turned into a linear 1×64 sequence, using the standard zigzag pattern. with DCT being an immediate change from the maximum or minimum to the other extreme. One of the limitations of DCT is that it doesn’t handle text very well, because text if full of sharp edges.

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