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https://en.wikipedia.org/wiki/JPEG_2000
JPEG 2000 code streams are regions of interest that offer several mechanisms to support spatial random access or region of interest access at varying degrees of granularity. It is possible to store different parts of the same picture using different quality.Developed by: Joint Photographic Experts Group
https://gis.stackexchange.com/questions/304098/does-jpeg-2000-jp2-support-transparency-when-created
JPEG2000 does support transparency. See the GDAL file formats documentation here. Also see the relevant wiki page and not the 'side channel spatial information' section.
https://www.fastcompression.com/blog/jpeg-j2k-png-review.htm
Almost all devices can support JPEG, which is not the case for JPEG2000 It is compatible with most of the image processing apps JPEG images can be compressed up to 5% of their initial size.
http://www.imagemagick.org/discourse-server/viewtopic.php?t=26661
Dec 08, 2014 · As far as I can tell ImageMagick uses JasPer library for JPEG2000 conversion. The problem with using JasPer directly is that none of its support input formats themselves support transparency, even though the JasPer documentation implies that transparency is supported (it doesn't say it is or isn't, but it does talk a bit about how transparency is encoded.)
https://blenderartists.org/t/jpeg-2000-with-alpha-transparency-problem/457043
Apr 23, 2018 · Save your render file that requires the transparency channel (RGBA) in PNG format instead of JPEG2000. Assuming this will soon be fixed in 2.5, load the PNG via the compositor and save out again as Jpeg 2000. Or save the PNG file out as Jpeg2000 in an image editing program like GIMP.
https://stackoverflow.com/questions/27353132/jpeg2000-transparency-with-jasper-library
Dec 08, 2014 · I'm attempting to use JasPer JPEG2000 library to create transparent JPEG2000 images (actually I'm creating JPCs).. The issue I'm having is that I can't figure out how to make JasPer create a transparency image. None of its supported formats support transparency (with the exception of the JPEG2000 formats, which are what I'm trying to create):
https://cloudinary.com/blog/the_great_jpeg_2000_debate_analyzing_the_pros_and_cons_to_widespread_adoption
As awesome as JPEG 2000 is, there are some undesirable effects that has impeded its universal use and support. No universal browser support. The format is not backward compatible.Author: Prosper Otemuyiwa
https://stackoverflow.com/questions/2639866/jpeg-image-with-alpha-channel-on-website
To claim, that jpeg supports transparency, means that the JPEG standard supports transparency, in the sense that it doesn't care about a channel's meaning - 'transparency' is as good a meaning as 'blue'. Your comment is more about whether standard software actually supports a JPEG feature.
https://www.axialis.com/docs/iw/Create_a_Windows__icon_from_an_image.htm
It is JPEG, so it does not contains transparency (only JPEG 2000 supports transparency). The background is white ( ) and fully opaque. If you create an icon from this image, it will create a white square around the final icon, which is not the desired result.
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