February 2006
Intermediate to advanced
826 pages
63h 42m
English
Content preview from Web Design in a Nutshell, 3rd EditionBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Progressive Display (Interlacing)
Like GIFs, PNGs can be encoded for interlaced display. When this option is selected, the image displays in a series of passes; the first pass displays after only a portion of the file has been downloaded, and each subsequent pass increases in detail and clarity until the whole image is rendered.
Interlaced PNGs display over a series of seven passes (using a method known as Adam7, named for its creator, Adam Costello). The first rendering of the image appears after only 1/64 of the file has downloaded (that’s eight times faster than GIF). Unlike GIF, which fills in horizontal rows of information, PNGs fill in both horizontally and vertically. Interlacing can add to the file size of PNGs, especially on small images (which don’t really need to be interlaced anyway). To keep file sizes as small as possible, turn interlacing off.
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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