Graphics Programs Reference
In-Depth Information
Soft proof:
The process of using ICC color management to produce a
preview of an image on screen that simulates (proofs) how that image
will output to a specific printer.
Source profile:
An ICC profile used to define the characteristics of a device
or image for conversion. All color space conversions using ICC profiles
require a source and destination to be specified in order for the conver-
sion to be carried out. The source profile defines the characteristics of the
device or image that subsequently will be converted using the Destina-
tion profile.
Spectral data:
Data that usually is produced from a device like a Spec-
trophotometer that defines the colors measured, broken down in the
spectrum of light the measured sample reflects or emits.
Spectrophotometer:
An instrument used to measure the amount of light
a color sample reflects or transmits at each wavelength, and that can
break the colored measurements down into the visual light spectrum. See
also
Spectral data
.
Spectrum:
The distribution of electromagnetic radiation (light) in order
of wavelengths. Passing white light through a prism is an example of the
spectrum of visible light broken down into its component wavelengths
of colors.
Specular highlight:
Brightest highlight in an image that may or may not
have a printable dot. The bright shiny reflection on a chrome bumper
would be an example of a specular highlight. Often these highlights are
paper white in a good photographic print, providing the contrast neces-
sary (along with a good black) to produce the effect of a full tone print.
Substrate:
Paper or other material on which a printer places an image.
TAC (Total Ink Coverage):
See
Total Ink Limit
.
Tagging (
also
embedding):
Placing a profile inside an image file for a CMS
to utilize for previews and conversions. Tagging or embedding a profile
ensures that the ICC profile is saved within the file itself. Not all file
formats support profile embedding, however the more common file types
such as TIFF, JPEG, and PSD files do.
TDF (Target Description File):
A text file that contains the measured data
of a target used in the profiling process.
Tone Response Curve (TRC):
The relationship of input (digital value,
voltage, energy) to output (luminance, density). Often incorrectly called
gamma or gamma curve when, in fact, this plotting of input/output
values isn't based upon the specific curve described by the gamma
formula. Also called simply tone curve, tone luminance, or tone
correction.
