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even though it is heavily compressed, it is near studio master quality when encoded properly and carefully Technically, analog laserdisc video is also compressed, since the color component (chroma) of the video is reduced to less than one-sixth the resolution of the brightness component (luma) This does not mean that the video quality of DVD is always better than that of laserdisc only that it can and should be better Poorly made DVDs look worse than well-made laserdiscs, but any DVD that has had sufficient care taken in the process of film transfer and compression should look better than a laserdisc made with equal care It is worth noting that the average television under 25 inches does not have the precision to show much difference between laserdisc and DVD Home theater systems using large or widescreen TV sets with s-video or component video inputs are needed to take best advantage of the improved picture quality of DVD Of course, just as with vinyl records and CDs, the arguments about analog laserdisc quality versus digital DVD quality will rage eternally The only final answer is to compare them objectively, side by side, and form your own opinion Noise Most laserdisc players make a whirring noise that can be heard during quiet segments of a movie This does not bother some people but is quite annoying to others This mechanical noise is due to the large size and higher spin rate of laserdiscs (600 to 1800 rpm compared with 600 to 1600 rpm for DVDs and 200 to 500 rpm for CDs), especially since the outer edge of a 30-centimeter laserdisc moves much faster than the outer edge of an 8-centimeter DVD spinning at the same rate Most DVD players are as quiet as CD players Subtitles When subtitles are included on a laserdisc, they must be added permanently to the video picture On letterboxed movies, they can be placed in the matte area so as not to cover up the picture, but they are still obtrusive, especially to those who do not like subtitles DVD allows up to 32 different subtitles or graphic overlays that can be turned on or off at any time Reliability Laserdiscs were based on very advanced technology when they were introduced, and they still show signs of that heritage Production is expensive, and stamping small, precise pits on such a large surface makes clean mold separation difficult CDs and DVDs were based on better-established technology when they were introduced, leading to simpler and more reliable production
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Both laserdiscs and DVDs are made from two bonded substrates, but the thinner profile and smaller size of DVDs make them much more stable and subject to fewer warp problems Laserdiscs are subject to what is commonly called laser rot : the deterioration of the aluminum coating that can occur if the seal between disc sides is broken Laserdiscs absorb moisture, which can penetrate the seal The large size of laserdiscs makes them flexible, thus enabling more movement along the bond between sides, which can ruin the aluminum layer This was mostly a problem during early days of laserdisc replication but still crops up from time to time DVDs are usually molded from polycarbonate, which absorbs about ten times less moisture than the acrylic used for laserdiscs DVDs are much more rigid, so less bond flexion occurs Laserdiscs incorporate no error correction, although many newer players have noise-reduction circuitry Noise in analog video is expected and accepted Laserdisc video often suffers from dropouts, small white specks caused by minor imperfections and scratches Severe flaws or large scratches can cause playback to skip or may cause the disc to be unplayable Because DVD is a digital medium, errors can have a more drastic result than on laserdisc This is why the DVD format includes a very robust errorcorrection system that can compensate for scratches as wide as 6 mm Most imperfections or scratches on a DVD disc will not affect playback Large flaws or scratches may cause the picture to skip or break up and may even render the disc unplayable On the whole, DVD is more tolerant of physical flaws and surface damage than laserdisc Availability and Support Many more manufacturers of DVD players exist than of laserdisc players, without counting computers that can play DVD-Video Dealers were amazingly quick to clear out their inventories of laserdiscs and players and replace them with DVD discs and players The rapid decline of the laserdisc market has meant that most new releases and rereleases are only available on DVD Price DVD players and discs are cheaper than laserdisc players and laserdiscs The ability to use components made cheap by the huge DVDROM and CD markets and the rapidly expanding use of digital video and digital audio are driving down costs DVDs are cheaper to replicate than laserdiscs, and production costs have dropped to the point where DVDs can be produced with a desktop computer and replicated for less than $2 a copy Initial pricing for DVD movies was at the same level as VHS tapes, about 30 percent lower than laserdiscs Some Hollywood studios have begun releasing older movies on DVD at even lower prices than videotape
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