Accom APR Attache User Manual
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Contents
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Accom APRyy$WWDFKp Digital Disk Recorder16 User Guide1.7 Computer/Video Transfer LimitationsWhen transferring any image between two environments, there will be certainlimitations associated with the transfer. When a computer image of a particular fileformat is created in one drawing program and is transferred to a different file formatfor use in another drawing program, there will be some degradation or limitations thatthe transfer imposes. The same applies, for example, when converting an image fromthe 525-line television standard to the 625-line television standard.In the same manner, there are certain limitations that affect images that aretransferred between the computer environment and the television environment. It’sbeyond the scope of this manual to discuss all the limitations these transfer processesimpose, with possible solutions. Instead, we will discuss only the major problems.These are system limitations, and are not specifically problems with the Attachéitself. These limitations do not restrict your creativity using your computer graphicssoftware and equipment, as is obvious from the vast array of computer generatedimages used in commercial television. The limitations discussed here are to makeyou aware of them and to help you create the best possible images for use in thetelevision environment. You should refer to text books on computer graphics for afull discussion of these subjects. Many manuals with commonly used graphicsprograms also address these issues, and suggest ways to minimize the effects usingthe particular program.n Line StandardsThe Workstation monitor and computer working environment often has a “linestandard” of more than 1000 lines. Television has a standard of 525 lines forNTSC, or 625 lines for PAL. When the computer image is converted from morethan 1000 lines down to either 525 or 625 lines for television image storage in theAttaché, you may notice a corresponding loss in image resolution.n File Format TypesSee also “Color Space” below. Computer images are typically generated using theRGB format. For use in video systems, this image must be converted to the videostandard YUV (Y, B-Y, and R-Y) signals. The “color space” of RGB is slightlylarger than the color space for YUV. Therefore, when software conversion fromRGB to YUV is performed, you may notice a slight change in rendered colors depending upon the colors used in the image. Attaché features a software color |
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