vb.net create barcode image Figure 314 Soft matte filming in Software

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Figure 314 Soft matte filming
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Figure 315 Pan and scan transfer
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plate on the projector When the movie is transferred to video for 4:3 presentation, the full frame is available for the pan and scan (and zoom) process18 In many cases, the director of photography or even the director approves the transfer to ensure that the intention and integrity of the
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18 Contrast this to hard matte filming, where the top and bottom are physically and permanently blacked out to create a wide aspect ratio Movies filmed with anamorphic lenses also have a permanently wide aspect ratio, with no extra picture at the top or bottom
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original filming are maintained Full control over how the picture is reframed is very important For example, when the mattes are removed, close-up shots become medium shots, and the frame may need to be zoomed in to recreate the intimacy of the original shot In a sense, the film is being composed anew for the new aspect The pan and scan process has the disadvantage of losing some of the original picture but is able to make the most of the 4:3 television screen and is able to enlarge the picture to compensate for the smaller size and lower resolution as compared with a theater screen The third peg-and-hole solution has been used for years to fit widescreen movies onto standard 35-mm film As filmmakers tried to enhance the theater experience with ever wider screens, they needed some way to get the image on the film without requiring new wider film and new projectors in every theater They came up with the anamorphic process, where the camera is fitted with an anamorphic lens that squeezes the picture horizontally, changing its shape so that it fits in a standard film frame The projector is fitted with a lens that unsqueezes the image back to its original width when it is projected (Figure 316) It is as if the peg were accordion-shaped so that it can be squeezed into the square hole and then pop back into shape after it is removed You may have seen this distortion effect at the end of a Western movie where John Wayne suddenly becomes tall and skinny so that the credits will fit between the edges of the screen
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DVD mixes and matches all the preceding techniques Three standard methods are targeted for 4:3 displays, while a newer format is intended for widescreen displays The four options provided by DVD are as follows (Figure 317): 1 Full frame ( the peg fits the hole ) Most material shot for television is already in 4:3 format Older movies, such as The Wizard of Oz, were filmed in 4:3 aspect ratio 2 Pan and scan ( chop off the sides ) This is the traditional fill the frame way of showing video on a standard TV When the film is converted to video, the transfer artist (also called colorist or telecine artist) uses a variety of techniques to make the picture fill the screen and best follow the story, including zooming in and out and scanning up, down, left, and right The zoom technique is often used with soft matte movies to preserve the nuances of close-ups
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Figure 316 The anamorphic process
Figure 317a-o Aspect ratios, conversions, and displays
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3 Letterbox ( shrink and matte ) This is the alternate way of showing widescreen video on a standard TV, preferred by videophiles and popularized by laserdiscs The original theatrical image is boxed into the 4:3 frame by adding black mattes to the top and bottom of the picture 4 Widescreen ( accordion squeeze ) One of the advantages of DVD-Video for home theater systems is widescreen support DVD supports wide images by using a 16:9 (178) aspect ratio that is anamorphically squeezed into a 4:3 TV shape before being stored on the disc19 (The 4:3 ratio can be expressed as 12:9, so in order to get from 16:9 to 12:9, the width needs to be reduced by 25 percent, from 16 down to 12) Widescreen televisions have a wider scanning pattern to display the full 16:9 shape DVD players also can display widescreen video on a standard 4:3 TV20 There are three ways to do this, including two options similar to those performed during video transfer, but in this case they are performed by the player
Automatic letterbox All DVD players can add letterbox mattes when displaying widescreen video on a 4:3 display The player actually squeezes the image vertically by 25 percent (the same amount it was squeezed horizontally in the anamorphic process) so that its proper proportions are restored Automatic pan and scan Center-of-interest information can be included with the widescreen video to tell the player which part to extract The player chops off the indicated amount from each side and then unsqueezes the remaining picture to create a 4:3 image for the TV Lie to the player A DVD player has no way to know what kind of TV you have, so you can tell it to send a 16:9 picture to a 4:3 TV You will
Some people prefer to think of anamorphic video as being stretched vertically rather than squeezed horizontally The difference is largely a matter of semantics If anamorphic video were stretched vertically from a letterboxed source after being transferred from film to video, it would lose resolution, but in practice, it happens during the transfer process, so it is largely a matter of perspective whether you think of the video as being squeezed horizontally or stretched vertically Matching the source to the height of the 4:3 shape and squeezing horizontally comes out the same as matching the width of the 4:3 shape and stretching vertically A widescreen TV increases horizontal sweep to stretch anamorphic video from a standard NTSC signal, whereas some 4:3 TVs decrease vertical scan pitch to achieve a 16:9 aspect ratio, so either point of view is valid
Anamorphic video is not unique to DVD There are a few anamorphic laserdiscs and even rare anamorphic videotapes The problem is that they can only be viewed properly on a widescreen TV Unlike DVD players, standard laserdisc players and VCRs are unable to adapt anamorphic video for standard TVs
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