When reproducing colored originals, the different devices (scanner, monitor, printer, etc.) have to work in different color spaces (RGB, CMY or CMYK), therefore all using color differently. The RGB color spaces of different platforms, for example, differ slightly (Apple® Macintosh®: MacRGB; Windows® PC: SRGB).
You also have to take into consideration that every device is only able to record and reproduce a specific area of (visible) colors. This area of visible colors is also called "Gamut". For example, a (simple) printer might be unable to display the bright red of a color photo.
The reproduction of colored originals always only approaches the original. High-quality devices guarantee an output which comes near the original. It is very likely that the monitor display of a scanned photo looks different to the original. Another discrepancy to the original might occur due to different printer's colors.
The color spaces (as described above: RGB, CMY and CMYK) depend on the devices used. Therefore the HP Designjet 50ps software uses a color management system, a device-independent LAB color space and so-called ICC profiles. The color definition of the LAB color space is based on human eye perception. The LAB color space allows you to exchange color data independently of systems and devices.
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