Are there still any HEIF problems? The full HEIF spec was posted to http://standards.iso.org/ittf/PubliclyA ... 2_2017.zip recently, so any implementation can be compared against it.
FWIW: ImageMagick has an implementation based on libde265 now, another point to test against to see where the problem might be.
XnView 2.42 with HEIF-Plugin : HEIF-file could not be opened
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Re: XN-View 2.42 with HEIF-Plugin: HEIF-file could not be opened
It seems that ImageMagick has quality issue with HEIC to JPEG conversion. Images has a lot of artifacts, you can check it with recent version of imagemagic or with site https://heic2jpeg.com/FWIW: ImageMagick has an implementation based on libde265 now, another point to test against to see where the problem might be.
I've tested with
# convert --version
Version: ImageMagick 7.0.7-33 Q16 x86_64 2018-05-18 https://www.imagemagick.org
Copyright: © 1999-2018 ImageMagick Studio LLC
Features: Cipher DPC HDRI Modules
Delegates (built-in): bzlib freetype heic jng jpeg ltdl lzma png tiff xml zlib