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Blu-ray Disc Demystified
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j Blurriness refers to low detail and fuzziness of video This results from low-qual-
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ity source video or too much filtering of the video before encoding j Worms or crawlies are squirming lines and crawling dots Usually this results from low-quality source video or bad digitizing This also may be the result of electrical interference All this said, the number one cause of bad video is a poorly adjusted display! The high fidelity of Blu-ray video demands much more from the display Turning up the sharpness control was the standard operating procedure when viewing fuzzy analog video, but this artifically enhances edges, which makes hidden compression artifacts in digital video stand out and actually makes the picture look worse Lower the sharpness value and turn the brightness down, and you will be surprised at the improvement these simple adjustments may bring See 7, Players for more information
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Myth: Video Compression Does Not Work for Animation
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It is often claimed that animation, especially hand-drawn cell animation such as cartoons and Japanese anime, does not compress well Others claim that animation is so simple that it compresses better Neither is generally true Supposedly, jitter between frames caused by differences in the drawings or in their alignment causes problems Modern animation techniques produce very exact alignment, so usually no variation occurs between object positions from frame to frame unless it is an intentional effect And of course, computer-generated animation has no misalignment between frames Even when objects change position between frames, the motion estimation feature of the encoder can easily compensate That said, encoders are typically optimized for live action and may have trouble with animated content Because of the way Blu-ray video is compressed, it may have difficulty with the sharp edges common in animation This loss of high-frequency information can show up as ringing or blurry spots along high-contrast edges However, at the data rates commonly used for Bluray, this problem normally does not occur The complexity of sharp edges tends to be balanced out by the simplicity of broad areas of single colors As with DVD, some of the Bluray Discs with the most gorgeous pictures are from animated features
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Myth: Discs Are Too Fragile to Be Rented
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This myth was pretty well demolished by Netflix, which not only rents DVDs and Blu-ray Discs but has the audacity to send them through the US Postal Service, one of the most destructive forces known to modern civilization Discs are, of course, vulnerable to scratches, cracks, accumulation of dirt, and fingerprints But these occur at the surface of the disc where they are out of focus to the laser Damage and imperfections may cause minor channel data errors that are easily corrected A common misperception is that a scratch will be worse on a Blu-ray Disc than on a CD or a DVD because of higher areal density and because the audio and video are more compressed Blu-
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Blu-ray Disc Demystified
Myths
ray data density is about five times that of DVD, and about 65 times that of CD-ROM, so it is true that a scratch will affect more data But Blu-ray error correction is more effective than DVD and CD error correction This improved reliability makes up for the density increase More importantly, Blu-ray discs include a special hardcoat that makes them much less susceptible to scratches and other surface damage However, major scratches on a disc may cause uncorrectable errors that will cause a read error on a computer or show up as a momentary glitch in the picture from a player DVDs and CDs are likewise subject to scratches, but many rental stores and libraries offer them Manufacturers are fond of taking a disc, rubbing it vigorously with sandpaper, and then placing it in a player, where it plays perfectly Disc cleaning/polishing products can repair minor damage Commercial polishing machines can restore a disc to pristine condition after an amazing amount of abuse
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