Colour Management: Why and How
نویسندگان
چکیده
The purpose of this presentation is to stress the need for colour management whenever a computer is used for the acquisition, visualisation, or reproduction of coloured objects. By calibrating colour peripherals to a common standard, Colour Management System (CMS) software makes it easier to match the colours that are scanned to those that appear on the monitor and printer, and also to match colours designed on the monitor, using for example CAD software, to the printed document. Color management is highly relevant to persons using computers for working with art, architecture, desktop publishing or photography, but also to non-professionals, as for example when displaying and printing images downloaded from the internet or from a PhotoCD. But where is the problem in all this? For example, one might say: “I know that my scanner provides me with a description of each colour as a unique combination of red, green, and blue (RGB) and so does my monitor, and even my ink-jet printer accepts RGB images!” The problem is that even if these devices all ’speak’ RGB, the way they describe colours (scanner-RGB, monitor-RGB and printer-RGB) are substantially different, even for peripherals of the same type. An obvious example of this is that an image printed on glossy paper by a sublimation printer is considerably more colourful than the same image printed on plain paper by an old ink-jet printer. When displaying scanned images directly on a computer monitor without colour management, the colour differences between the original and the monitor images can be very large, e.g. with a mean , which is way beyond the limits of acceptable colour differences [1].
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تاریخ انتشار 1998