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https://en.wikipedia.org/wiki/Transparency_(graphic)
Internet Explorer prior to version 7 does not support partial transparency in a PNG graphic. Very few applications correctly process TIFF files with alpha channels. A major use of partial transparency, but not the only one, is to produce "soft edges" in graphics so that they blend into their background.
https://ezgif.com/help/gif-transparency
Can parts of GIF be made semi-transparent? Unfortunately no, the GIF format doesn't support partial (alpha-channel) transparency, meaning any pixel can only be fully tansparent or fully opaque, so it's not possible to make partially transparent GIFs and achieve anti-aliasing effect against different backgrounds.
https://graphicdesign.stackexchange.com/questions/94544/saving-animated-gif-with-transparency-photoshop
The GIF format doesn't support semi-transparency. There is only one level of transparency in GIF images - i.e fully transparent. However, there might be a solution. The APNG format (Animated PNG) does support multiple levels of transparency - however, not all browsers support the format, and neither does Photoshop, unfortunately.
https://answers.yahoo.com/question/index?qid=20110228211016AAQ9RGN
Feb 28, 2011 · PNG pretty much obsoletes GIF in nearly all cases except for animation (although it still have a little bit of browser support problem, IE6 doesn't support PNG's alpha transparency although regular GIF-like transparency is no problem). PNG is lossless format which means color information is fully intact. GIF is nowadays only useful for animation.
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://www.videomaker.com/article/9412-alphas-made-transparent
Instead, the GIF uses binary transparency. This means that instead of being able to control the degree of transparency, a GIF image’s pixels can be set either to an on or off value (totally transparent or opaque). By contrast, file formats that support alpha channels allow 256 possible transparency settings – totally transparent, totally ...
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