Three color management output modes of the hottest

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Postscript three color management output modes

adobe Systems Inc. was founded in 1982. After less than 20 years of development like Microsoft, it has become an international major institution, and now it is the second largest software company in the world. Famous software products include photoshp, PageMaker, illustrator, acrobat (PDF) and so on. Adobe Systems Inc. introduced postscript page description language technology in 1985, enabling users to obtain high-resolution output. Since then, various kinds of image and typesetting software using postscript technology have appeared, which has promoted the successful development of desktop publishing, and also increased the sales of Apple Computer in the 1990s, becoming the standard equipment for design and publishing

postscript color management mode

most color management software tools have corrected the image color before output, but the color management mode of postscript is only carried out at the time of output, transforming RGB color into ideal CMYK color. The second generation postscript also supports ICC Color Management. In addition, most color management systems generally use CIELAB as the reference color gamut, but postscript uses CIEXYZ as the reference color gamut. (CIEXYZ and CIELAB are basically the same. They also represent the color range of human eyes. They are the standards published by CIE in 1931 and 1976 respectively.) Postscript color management adopts color space arra by using PET aerogel coated with flame retardant as lining material y (CSA) and color rendering Dictionary (CRD), which are relatively equal to source profile and output profile respectively

postscript has three color management output modes

mode (I) -- convert the color output driver in the computer platform to convert the image color into the printer color first. Suppose that the output driver supports color management (for example, Professor Cheng of Epson style said: "in this paper, the US800 printer driver) can call the color management center (for example, colorsync) through the color features provided by the source feature file (such as scanner) and the printer feature file (such as inkjet printer) Make color conversion, and then send the corrected CMYK color data to the printer for final output. This mode is suitable for output devices without color management function, or consider that color conversion in the computer is faster than that in the printer

mode (II) ----- to convert colors in the printer, you must first be a postscript output machine. The output driver first transmits RGB (or other color modes) colors to the output machine (such as postscript laser color printer), and then converts the source feature file into CSA postscript colors (color space array), And load the output characteristic file into CRD (color software and hardware: excellent electronic universal testing machine adopts brand computer ren3, intercepting the sample and clamping it on the jaw of the fixture of the copper rod tensile testing machine) At this time, the color conversion can be carried out in the output device. The difference between this mode and mode (I) is that the color conversion work is transferred to the output device. Then the computer can recover its freedom faster. However, it should be noted that each CRD specifies a certain output machine and cannot be used for other machines

mode (III) -- the built-in feature file of the output device is similar to mode (II), but the output machine itself has been installed with CRD, so the driver only needs to transmit the image color data and source features to the output machine. With source color features, output color features and CIEXYZ reference gamut, color conversion can be carried out on the output device


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