logo design glossary[A]

Adobe Acrobat Viewer: Application to create and view PDF files (Potable Document Files).

Aliasing: This 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. 

Anti-aliasing: The blending of pixel colors on the perimeter of hard-edged shapes, like type, to smooth undesirable edges (jaggies).

Alpha channel: A special 8-bit grayscale channel that is used for saving a selection in graphics programs. 

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 adjacent pages.~

Ascender: in type, the parts of lowercase characters that rise above the x-height of the font, e.g. b, d, f, h, k, I, and t.

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