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This is an often neglected aspect of digital photography. The purpose of monitor calibration is to measure and adjust a monitor's colour response and establish a relationship to a known standard colour space. Default monitor settings or settings done manually will not conform to this colour standard. Calibration is done with a colorimeter of which there are several brands and models available. To achieve colour consistency between an image viewed on a monitor and that of a print made of the image, a colour profile needs to be made which is used by editing software as a working colour space. That is the task of the colorimeter. Because monitor colours and luminance drift over time, colorimeter calibration should be done on a regular basis to maintain consistency - monthly is recommended.