On Saturday 19 April 2008 02:36, jdd sur free wrote:
Carlos E. R. a écrit :
I guess progressive means that it displays first as fuzzy and improves quality as the file is downloaded. But this is a wild guess without backing.
AFAIK it's an interleaved drawing (like a tv video) for faster diplaying in web pages
Except that in the television context, the distinction is interleaved vs. progressive scan. Interleaved means each frame comes in two "fields" of alternating scan lines (first the odd numbered, then the even numbered lines). Progressive scan draws (or sends) each frame in a single pass from top to bottom. As suggested, in the JPEG world, "progressive" means progressive detail. In the bad old days of modems, data transmission speeds were so low you could see the progressive refinement of such images as they arrived and the displayed image went from being a few vague blocks to the final, full-resolution image.
jdd
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