In the printing industry, the first press proof is called a proof. This term has been adopted for color printers. It is a control print that serves as a color reference for the production run. In the printing industry, the proof is compared with individual prints during the printing process and, in the event of deviations, the primary colors - cyan, magenta, yellow - and the depth are readjusted.
If, for example, the printout from an inkjet printer is to be used as a proof for the press, then considerable deviations can occur. This is because the color space ofinkjet prin ters is larger than that of printing presses. In addition, the same colors have different effects on different papers. In order to still be able to use a printer printout as a color-accurate proof, the inkjet printer must work with the CMYK color model and have advanced PostScript capabilities provided by the Raster Image Processor( RIP). RIPs come in the form of built-in or external hardware and also as software. They provide for the retranslation of print data into a form readable by inkjet printers.
For comparable and reproducible results that can be regarded as color-accurate, the International Color Consortium( ICC) has created the color behavior of color printers, inks, papers, print resolution, dithering and print density in the form of profiles, the so-called ICC color profiles.