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| Color Management Systems |
| The Color Management Module (CMM) |
The Color Management Module (CMM), sometimes called the Color Engine, is the part of the CMS that maps one gamut to another. When colors consistent with one device's gamut are displayed on a device with a different gamut, a CMM uses device profiles and render intents to optimize the displayed colors between the two devices. The CMM does this by mapping the out-of-gamut colors into the range of colors that can be produced by the destination device.
Each CMS has a default CMM, but may support additional CMMs as well. For example, Apple ColorSync 2.6, a CMS for the Mac OS, uses Heidelberg's CMM by default, but also supports other CMMs such as those in Kodak's KCMS and Agfa's FotoTune.
In Windows 95 and Windows NT 4.0, color management does not occur at the system level, but at the application level using CMSs like Kodak KCMS and Agfa's FotoTune. Windows 98 and Windows 2000 use ICM 2.0, which was developed by Microsoft and uses the same Heidelberg CMM as ColorSync 2.6. At this writing, implementation of ICM 2.0 may not be comparable to ColorSync on Mac OS, so it's unclear how much the situation will change in the Windows environment.
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