Colorimeter A device that measures luminosity of RGB light. When used with software, can be used to create ICC device profiles for monitors. Adobe PageMaker, Adobe Photoshop, and Adobe Illustrator currently support ColorSync 2.x and later. They are used in the printing industry to measure the output accuracy of halftone screens as discreet dot percentages. For that reason, they are used as a calibration tool for imagesetters and printing presses.
Profiles can be either generic or custom.
Custom device profiles are far more accurate than generic device profiles, but cost more to create. The CIE Lab is an example of a Reference Color Space. This component is built into the CMM, it is neither alterable nor visible to users. The three methods are called Perceptual, Saturation, and Relative Colorimetric. In PageMaker and Illustrator the names of the rendering intents are called Image, Graphics, and Colorimetric, but they do the same thing.