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https://stackoverflow.com/questions/2639866/jpeg-image-with-alpha-channel-on-website
Unless browsers give us support for alpha channel or a new image format there will be only workarounds. Using a jpeg for image and a png for mask would reduce drastically the size, but will increase the file count (2 IMAGE+ALPHA instead of 1 IMAGE with ALPHA).
http://www.w3.org/Graphics/PNG/inline-alpha.html
Test inline PNG images Alpha channel support. PNG images can contain alpha (transparency) information. Unlike GIF, which requires a particular color to be designated fully transparent, PNG allows the transparency of all pixels to take any value from fully transparent though partial transparency to …
http://libpng.org/pub/png/pngapbr.html
Likewise, PNG's alpha-channel support (including "RGBA palette" mode) and support for automatic gamma correction are particularly useful on the Web--at least where fully and correctly supported by browsers. This page lists standard 2D browsers; see the appropriate pages for listings of VRML browsers and other 3D applications.
https://stackoverflow.com/questions/5825716/png-24-and-browser-support
Browser support is good enough that you can use PNG-24. IE6 even supports PNG-24. If you're using the images for sliders, though, you'll probably want transparency and PNG-32 is supported by every modern browser as well.
https://en.wikipedia.org/wiki/Portable_Network_Graphics
PNG supports non-premultiplied alpha only whereas TIFF also supports "associated" (premultiplied) alpha. Software support. The official reference implementation of the PNG format is the programming library libpng. It is published as free software under the terms of a permissive free software license. Therefore, it is usually found as an ...Developed by: PNG Development Group (donated to W3C)
https://community.adobe.com/t5/photoshop/how-do-i-save-a-png-file-with-an-alpha-channel-in-photoshop-cs5/td-p/5369920
Aug 22, 2013 · I have a PNG file created in Photoshop and I need to save it with an alpha channel for web purposes. I tried 'Save for Web & Devices' and selecting the Transparent box. Then, after saving, when I select 'get info' for the file it says there is no alpha channel. I'm stumped I …
https://wiki.mozilla.org/Fixing_transparent_PNGs
Among other problems, this browser doesn't properly support PNG images with alpha channel transparency. This has given rise to the myth that IE doesn't support transparent PNGs. IE does support transparency in indexed-color PNG images in which a color is reserved for transparency: in most cases this is going to mean saving as 8-bit rather than ...
https://helpx.adobe.com/experience-manager/scene7/kb/base/transparency-alpha-channel/layer-transparency-masks-alpha-channels.html
PNG does not support arbitrary alpha channels like other formats such as TIFF. PNG specifies that the fourth channel in a file is transparency, and only transparency. When you open a PNG file with transparency in Photoshop, it is considered a single layer image. It is not a flat background image.
https://meta.wikimedia.org/wiki/Fixing_transparent_PNGs
A "decent" percentage of Internet users might use Internet Explorer for Windows as their primary web browser. Among other problems, this browser doesn't properly support PNG images with alpha channel transparency. This has given rise to the myth that IE doesn't support transparent PNGs. IE does support transparency in indexed-color PNG images in which a color is reserved for transparency: in ...
https://en.wikipedia.org/wiki/APNG
APNG competes with Multiple-image Network Graphics (MNG), a comprehensive format for bitmapped animations created by the same team as PNG. APNG's advantage is the smaller library size and compatibility with older PNG implementations. As of July, 2019, the only major browsers that still don't support APNG are Internet Explorer and Microsoft Edge.Extended from: PNG
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