Adobe Acrobat: Suite of applications to create
and view PDF files.
Adobe Illustrator file format (.AI files):
AI was developed by Adobe Systems for the Windows
and Macintosh platforms. It is primarily vector based
although later versions, such as versions 6.0 and 7.0,
support bitmap information.
Adobe Photo file format (PSD.files):The
PSD file format (.psd files) is the native bitmap file
format for Adobe Photoshop.
Aliasing: The term is commonly applied to spatial
aliasing, which manifests as visible pixelation - a blocky
or jagged effect - especially with near horizontal or
near vertical lines of high contrast.
Arrow keys: Direction
keys that move or "nudge" selected objects in
small increments. You can also use Arrow keys to position
the cursor when you type or edit text onscreen or in a
dialog box.
Aspect Ratio: The ratio of the width
of an image to its height (expressed mathematically as
x:y). For example, the aspect ratio of an image that is
640 x 480 pixels is 4:3.
Anti-aliasing: You can change
the on-screen appearance of text by smoothing the font
edges. Anti-aliasing fills jagged pixels with intermediate
color or shades of gray to increase clarity. The effect
is easier to view on large fonts or by zooming in on the
text.
Anti-alias: The blending of pixel
colors on the perimeter of hard-edged shapes, like type,
to smooth undesirable edges (jaggies).
AutoCAD Drawing Database (.dwg files): are vector
files used as a native format for AutoCAD drawings.
Animated Gif: The Graphic Interchange Format (.gif
files), developed by CompuServe Inc., is a bitmap-based
format designed for use on the World Wide Web. It is highly
compressed to minimize file transfer time and supports
images with 256 colors or fewer. The GIF format provides
the ability to store multiple bitmaps in a file. When
the multiple images are displayed in rapid succession,
the file is called an animated .gif file.
Anchor Point: The point that remains stationary
when you stretch, scale, mirror, or skew an object. Anchor
points correspond to the eight handles that display when
an object is selected.
Alpha channel A special 8-bit grayscale channel that
is used for saving a selection.
Alley: The space between columns within a page. Not
to be confused with the gutter, which is the combination
of the inside margins of two facing pages.
Ascender: In typography, the parts of lowercase
letters that rise above the x-height of the font, e.g.
b, d, f, h, k, I, and t.
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