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Hour 9. Creating Your Own Web Page Graph... > Interlaced GIFs and Progressive JPEG...

Interlaced GIFs and Progressive JPEGs

Both the GIF and JPEG image file formats offer a nifty feature that makes images appear faster than they otherwise could. An image can be stored in such a way that a "rough draft" of the image appears quickly, and the details are filled in as the download finishes. This has a profound psychological effect, because it gives people something to look at instead of drumming their fingers, waiting for a large image to pour slowly onto the screen.

A file stored with this feature is called an interlaced GIF or progressive JPEG. Despite the different names, the visual results are similar.


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