Color management workflow in Adobe After Effects CS4
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color space:
A color encoding that defines specific characteristics in a color model so a coor-
dinate defined inside a color space can be defined unambiguously in terms of appearance. For
example, the RGB color model contains a number of color spaces, including Apple RGB, Adobe
RGB (1998), and sRGB. Though each of these define color by the same three axes (R, G, and B),
they differ in gamut as well as other specific characteristics.
color temperature:
A measurement of the color of white light, expressed in Kelvin. (The Kelvin
scale is a measure of temperature, starting from absolute zero.) The color temperature is the color
of light a perfect black-body radiator emits when heated to that temperature. Computer monitors
typically have a color temperature of 5000-9300 Kelvins: 5000 Kelvins is a yellowish-white,
9300 Kelvins is a bluer white.
deltaE:
An amount used to specify color difference. DeltaE measures the distance between two
colors are apart in the L*a*b* color space.
destination profile:
An ICC color profile representing the device or color space to which color
values are converted to in order to preserve color appearance.
device-dependent:
Describes a color space defined in terms of physical colorants, such as
a monitor’s RGB or a printing press’s CMYK. So called because the actual color produced from
a set of device-dependent values depends on the colorants and physical properties of the device.
device-independent:
Describes a color model not related to any device, such as one instead based
on human visual perception. Device-independent color models contain all colors that may be
perceived by a human observer. They are used as the intermediary space known as the profile
connection space (PCS) in ICC color conversions, and may also be used to store or transmit
color values.
dPX:
File format normally representing the density of the three primary color channels in a scan
from negative film.
gamma:
The slope of a curve defining the relationship between input and output of tone. This
term is usually associated with monitors, defining the relationship between input signals from
the video card to signals sent to liquid crystal filters in a monitor.
hdTv (rec. 709):
ICC profile based on the capture and transfer characteristics of high-definition
video signals. (see Recommendation 709 below).
hdTv (rec. 709) 16-235:
ICC profile based on the capture and transfer characteristics for high-
definition video signals using a maximum highlight value of 235 and a minimum shadow value
of 16.
hue:
Differentiation of different areas of the visual spectrum. In common use, hue refers to the
name of the color, such as red, orange, or green.
iCC:
An open industry consortium with 60 members established for the purpose of creating,
promoting, and encouraging the standardization and evolution of an open, vendor-neutral,
cross-platform color management system architecture. For more information, visit the ICC Web
site at
www.color.org
.
iCC profile:
A file describing the color gamut and reproduction characteristics of a device—such
as a scanner, monitor, or printer—by mapping color values to a device-independent color space
like CIE XYZ or CIELAB.
image state:
An attribute of the image encoding indicating the part of the workflow the image
refers to. Examples of image state are scene images (scene-referred) and presentation viewing
images (output-referred). Scene images are can be understood to have a wider dynamic range and
less contrast than presentation viewing images.
luminance:
The brightness of a surface, determined by the amount of light it reflects or emits.
neutral:
Any color that is perceived to have no hue; such as white, gray, or black.
profile connection space (PCS):
A device-independent color space used by a CMM for translating
colors from one color space to another. The CMM translates colors from the source color space
defined by an ICC profile to the PCS, and then from the PCS to the destination color space using
