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Color management
Last updated 11/30/2015
Document profiles Define the specific RGB or CMYK color space of a document. By assigning, or tagging, a document
with a profile, the application provides a definition of actual color appearances in the document. For example, R=127,
G=12, B=107 is just a set of numbers that different devices will display differently. But when tagged with the Adobe
RGB color space, these numbers specify an actual color or wavelength of light–in this case, a specific color of purple.
When color management is on, Adobe applications automatically assign new documents a profile based on Working
Space options in the Color Settings dialog box. Documents without assigned profiles are known as untagged and
contain only raw color numbers. When working with untagged documents, Adobe applications use the current
working space profile to display and edit colors.
A Profiles describe the color spaces of the input device and the document B Using the profiles’ descriptions, the color management system identifies
the documents actual colors C
The monitors profile tells the color management system how to translate the document’s numeric values to the
monitor’s color space D
Using the output devices profile, the color management system translates the documents numeric values to the color
values of the output device so the correct appearance of colors is printed
About monitor calibration and characterization
Profiling software can both calibrate and characterize your monitor. Calibrating your monitor brings it into compliance
with a predefined standard—for example, adjusting your monitor so that it displays color using the graphics arts
standard white point color temperature of 5000° K (Kelvin). Characterizing your monitor simply creates a profile that
describes how the monitor is currently reproducing color.
Monitor calibration involves adjusting the following video settings:
Brightness and contrast The overall level and range, respectively, of display intensity. These parameters work just as
they do on a television. A monitor calibration utility helps you set an optimum brightness and contrast range for
calibration.
Gamma The brightness of the midtone values. The values produced by a monitor from black to white are nonlinear
if you graph the values, they form a curve, not a straight line. Gamma defines the value of that curve halfway between
black and white.
Phosphors The substances that CRT monitors use to emit light. Different phosphors have different color
characteristics.
White point The color and intensity of the brightest white the monitor can reproduce.
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