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http://www.jacklmoore.com/notes/ie-transparency-problems/
IE7 and IE8 have native PNG support for alpha-transparencies, but it falls to pieces as soon as opacity comes into the picture. When setting any value for opacity, even 100% (i.e. filter: alpha(opacity = 100) ), IE fills in the alpha-transparency of the PNG with a pure black fill.
http://libpng.org/pub/png/pngs-img-ie7w32.html
Both the second row on the color-test page and the final row in each block of the gamma-test page demonstrate that IE7 ignores the PNG ICC profile chunk (iCCP). It also ignores the PNG chromaticity chunk (cHRM, first row on color page).
https://webmasters.stackexchange.com/questions/31159/is-it-safe-to-assume-99-9-of-browsers-in-use-now-can-display-png-files
IE prior to IE7 did support PNG with transparency, but only with binary transparency, not alpha transparency. – choster Jun 21 '12 at 4:31
http://www.howtocreate.co.uk/alpha.html
PNG also supports binary transparency, as well as full Alpha, meaning that each pixel of the image can also have one of 256 different levels of transparency (or 65 thousand levels if you really want to). PNG format produces files with approximately the same file size as the equivalent GIF image, assuming they have the same number of colours.
http://christopher.org/png-transparency-for-internet-explorer-ie6-and-beyond/
Oct 30, 2007 · And although IE7 does display png’s with transparency – it also doesn’t display png’s correctly for background images. If there are hyperlinks in the div with a png background they become unclickable. So basically png’s are useless in IE – you’d be better off using conditional stylesheets and feeding IE gif’s instead.
https://graphicdesign.stackexchange.com/questions/66157/does-png-support-non-transparent-pictures
Every raster format support non transparent images, but only few does support transparency. The transparency on a png file is an aditional channel, this is, you have your rgb image (a simple graph or photo) and besides that you have one more channel that you can use or not.
https://24ways.org/2007/supersleight-transparent-png-in-ie6/
Up until IE7, there has been no fully native support for PNG alpha channel transparency in Internet Explorer. However, since IE5.5 there has been some support in the form of proprietary filter called the AlphaImageLoader.
https://www.htmlcenter.com/blog/cross-browser-semi-transparent-backgrounds/
Notes about IE6 PNG implementation: It is certainly possible to force PNG transparency using various javascript hacks in Internet Explorer 6 and earlier. However, it should be noted that most of the hacks I’ve come across up until now only apply to HTML images and will not work with background images.
https://www.webmasterworld.com/html/3046089.htm
Aug 14, 2006 · Most modern browsers support PNG transparency. 2) Internet Explorer 6 and older do not support that alpha channel and draw (semi-)transparent pixels in a awful greenish color. In IE7 that's fixed [blogs.msdn.com].
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