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Implementating Transparent PNGs in IE7

Posted by timothy on from the hammers-and-tongs dept.

Brandon writes "Over at the official IE Blog, Sam Fortiner has posted some very detailed information regarding Alpha PNG Rendering in IE7. From the article: 'As the dev who implemented the support, I can state that it was neither a bug-fix nor did it require a re-write of the display engine. Instead, it ended up being somewhere in-between the two and required what I would call "feature work." Implementing transparency support for PNG images required a significant amount of modification to the image decoding and display pipeline in IE along with a significant amount of new functionality added to the PNG decoder.'"

2 of 97 comments (clear)

  1. You are by leonbrooks · · Score: 4, Informative

    Konqueror displays partial images as they download. The original friggin' browser in OS/2 did the same thing. It's hardly new.

    Think about it: what's the whole purpose in Progressive-mode JPEGs?

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    Got time? Spend some of it coding or testing
  2. Re:libpng.... by Chris_Jefferson · · Score: 4, Informative

    If you read the article, you'd find the main problem is that all their internal data structures and rendering system were only designed for boolean transparency.

    libpng wouldn't have helped with either of these, and this is where most of the work was.

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    Combination - fun iPhone puzzling