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Reference
Glossary
InterlacedIf a computer-displayed image is interlaced, then it is rendered in
alternating horizontal lines. For example, browsers display interlaced GIFs
in alternating passes, skipping every other line and rendering a kind of
blurry image first and then sharpening it on subsequent passes. This is
useful if you'd like your viewers to get a general idea of the image while
they are downloading it. Interlacing for GIFs was designed to make bigger
images quicker to download, but the problem is that an interlaced GIF actually
has a larger file size than a non-interlaced GIF, so use this method
cautiously.
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