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https://en.wikipedia.org/wiki/Portable_Network_Graphics
PNG itself does not support animation at all. MNG is an extension to PNG that does; it was designed by members of the PNG Group. MNG shares PNG's basic structure and chunks, but it is significantly more complex and has a different file signature, which automatically renders it …Developed by: PNG Development Group (donated to W3C)
https://community.adobe.com/t5/photoshop/png-transparency-to-alpha-channel/td-p/8752004
Dec 24, 2016 · I also need to sometimes use an alpha channel with .png instead of what Photoshop translates as layer transparency. In the specific case of a .png file, an existing alpha channel is translated by Photoshop to layer transparency. It doesn't do this with Tiff …
https://theblog.adobe.com/exporting_video_with_an_alpha/
In some cases, a plus sign (as in Millions Of Colors+) denotes an alpha channel. In other cases, choosing to output to 32 bits per pixel implies the inclusion of the alpha channel; this refers to an output depth of 8 bits per channel for each of four channels: RGBA (where A is for alpha).Author: Todd Kopriva
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://community.adobe.com/t5/photoshop/creating-premultiplied-alpha-channels-with-png-and-other-formats/td-p/5398312
PNG, the format standard, does not support alpha channels, only a single transparency channel. PNG only allows 4 channels, and that fourth channel is transparency. Some video software packages misuse PNG and treat it as premultiplied, even though the file spec. says it must be straight color.
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.
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