- From: Karl Ove Hufthammer <karl@huftis.org>
- Date: Sat, 23 Nov 2002 19:32:05 +0100
- To: www-html@w3.org
Toby Inkster <tobyink@goddamn.co.uk> wrote in news:20021123173819.42970b43.tobyink@goddamn.co.uk: > AFAIK, it's never been part of any official recommendation, > but it was a good idea in some ways. Well, you can achieve a similar effect by using the PNG graphics format with Adam-7 interlacing. Then you get a low-resolution version of the image when just 1/64 of it has been downloaded (gradually improving when 1/32, 1/16, 1/8, 1/4, 1/2 and 1/1 of the image has been downloaded). These low-resolution 'previews' can be further enhanced by using resampling/interpolation. You'll find an example of this, with images of both regular resizing and bilinear and bicubic interpolation at <URL: http://www.its.caltech.edu/~stl/png.html >. Most modern browsers support progressive rendering of Adam-7 PNGs (though IE's support is a little strange), but non support interpolation. You'll find Mozilla's bug report on this at <URL: http://bugzilla.mozilla.org/show_bug.cgi?id=75077 >. The JPEG format also supports progressive rendering, but it's not as good at Adam-7 PNGs. -- Karl Ove Hufthammer
Received on Saturday, 23 November 2002 13:34:41 UTC