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Just a side note:
Recently I found archives of images stored in BPG format (Better Portable Graphics), a variant of HEIF. Trying to view them, I found that some famous Windows image viewers don't support it well, partially due to license doubts (IrfanView). For XnView I found a plugin which substitutes the partial support (bpgdec) by basic support via an encoder using x265, but it is not easily configurable (only via configuration file, globally). Web browsers can display BPG images via a JavaScript decoder for the HTML5 Canvas, written by the format author Fabrice Bellard.
The decoders I found so far are not very optimized, especially not multithreaded. Decoding a 150 MPx image takes several seconds. (You will probably guess well if you ask yourself who owns one of such 50K$ cameras...)
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