| progressive JPEG
Unlike normal JPEG images, which are
displayed one line at a time from top to bottom, progressive JPEGs are
displayed in alternating lines, then filled in on a second pass. Depending
on which graphics viewer or Web browser is being used, progressive JPEGs
may produce a "venetian blind" effect or simply a blurry or blocky image
that gradually sharpens. Pages using progressive JPEGs let people see at
least the outline of an image sooner, and often appear to load faster than
pages using normal JPEGs. |