Glossary | 715
tonal range
The distribution of pixels in a bitmap image from dark (a value of zero, indicating no brightness) to light (a value of 255, indicating full
brightness). Pixels in the first third of the range are considered shadows, pixels in the middle third of the range are considered midtones,
and pixels in the last third of the range are considered highlights. Ideally, the pixels in an image should be distributed across the entire tonal
range. A histogram is an excellent tool for viewing and evaluating the tonal range of images.
tone
The variations in a color or the range of grays between black and white.
transparency
The quality of an object that makes it easy to see through. Setting lower levels of transparency causes higher levels of opacity and less
visibility of the underlying items or image.
See also opacity.
trapping
See color trapping.
tree view
A hierarchical view of folders, sub-folders, and files. In the Symbol manager docker, the tree shows the current document at the top,
followed by collections and library files.
TrueType fonts
A font specification developed by Apple. TrueType fonts print the way they appear on the screen and can be resized to any height.
TWAIN
By using the TWAIN driver supplied by the manufacturer of the imaging hardware, Corel graphics applications can acquire images directly
from a digital camera or scanner.
two-point perspective
An effect created by lengthening or shortening two sides of an object to create the impression that the object is receding from view in two
directions.
U
underexposure
Insufficient light in an image.
See also exposure.
uniform fill
A type of fill used to apply one solid color to your image.
See also fill.
Unicode
A character encoding standard that defines character sets for all written languages in the world by using a 16-bit code set and more than
65, 000 characters. Unicode lets you handle text effectively regardless of the language of the text, your operating system, or the application
you are using.
URL (Uniform Resource Locator)
A unique address that defines where a webpage is located on the Internet.
V
vanishing point
A marker that appears when you select an extrusion or an object to which perspective has been added. With an extrusion, the vanishing
point marker indicates the depth (parallel extrusion) or the point at which the extruded surfaces would meet if extended (perspective
extrusion). In both cases, the vanishing point is indicated by an X.
