Glossary - Color Management for Photographers - page 433

Glossary
Absolute Colorimetric intent: See Rendering intent .
ACE (Adobe Color Engine): Adobe's CMM (Color Matching Module).
Applications such as Photoshop, Illustrator, and InDesign use this engine
to perform color space conversions. The ACE CMM was developed by
Adobe and currently functions only in Adobe applications. See also CMM .
Ambient light: The available light in a scene or environment. The light
falling on this page is illuminated by ambient light.
Bitmap data: An image file composed of 1-bit pixels. Pixels in a bitmap
are either on or off. Eventually all images and similar patterns need to
be in raster form for output since all printers ultimately produce a series
of dots. Sometimes referred to as raster data. See also Pixel , Raster data ,
and RIP .
Black Point Compensation: A software switch in Adobe's ACE CMM.
Turning this switch on causes ACE to ignore the actual luminance of black
in the source color space. With this switch on the darkest black in the
source space is mapped to the darkest black in the destination. It is rec-
ommended that you use Black Point Compensation in most situations.
Calibration: The adjustment of a device to a known and repeatable state.
Color output devices may drift over time. Calibrating a device brings it
back to the known behavior. Not all devices allow users to conduct
calibration.
Canned profile: An ICC profile built from a sample of devices. A canned
profile provides an average description for all such devices of the same
model. Manufacturers usually supply canned profiles as a means of color
managing their devices. They are a general representation of device
behavior as opposed to a custom profile, which is built from specific data
of a specific device. Also known as a generic profile.
Cathode ray tube (CRT): A vacuum tube coated with phosphors that when
struck with an electronic beam can emit a color image. A color CRT has
three phosphors. See also Phosphors .
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