-colorspace Gray on HEIC image produces corrupted file

[Anicky]

ImageMagick version

7.1.1-13

Operating system

Linux

Operating system, version and so on

Alpine 3.18.5

Description

When upgrading ImageMagick from version 7.1.0-16 to 7.1.1-13, our command to compress HEIC image and set colorspace to gray doesn't work anymore. It produces a corrupted file. Moreover, the process time is 6 times slower than before.

Before :

$ cat /etc/os-release

NAME="Alpine Linux"
ID=alpine
VERSION_ID=3.15.6
PRETTY_NAME="Alpine Linux v3.15"
HOME_URL="https://alpinelinux.org/"
BUG_REPORT_URL="https://bugs.alpinelinux.org/"

$ magick --version

Version: ImageMagick 7.1.0-16 Q16-HDRI x86_64 2021-11-21 https://imagemagick.org
Copyright: (C) 1999-2021 ImageMagick Studio LLC
License: https://imagemagick.org/script/license.php
Features: Cipher DPC HDRI Modules
Delegates (built-in): bzlib cairo fontconfig freetype gslib heic jng jpeg lcms ltdl lzma png ps rsvg tiff webp x xml zlib
Compiler: gcc (10.3)

$ time magick convert -quality 50 -colorspace Gray image.heic new1.heic

real    0m2.156s
user    0m23.128s
sys     0m0.251s

After :

$ cat /etc/os-release

NAME="Alpine Linux"
ID=alpine
VERSION_ID=3.18.5
PRETTY_NAME="Alpine Linux v3.18"
HOME_URL="https://alpinelinux.org/"
BUG_REPORT_URL="https://gitlab.alpinelinux.org/alpine/aports/-/issues"

$ magick --version

Version: ImageMagick 7.1.1-13 Q16-HDRI x86_64 21276 https://imagemagick.org
Copyright: (C) 1999 ImageMagick Studio LLC
License: https://imagemagick.org/script/license.php
Features: Cipher DPC HDRI Modules
Delegates (built-in): bzlib cairo fontconfig freetype gslib heic jng jpeg jxl lcms ltdl lzma png ps raw rsvg tiff webp x xml zlib
Compiler: gcc (12.2)

$ time magick convert -quality 50 -colorspace Gray image.heic new2.heic

real    0m11.927s
user    0m12.242s
sys     0m0.151s

The original image (image.heic) and the generated files (before : new1.heic, after : new2.heic) are attached below in a zip file.

Steps to Reproduce

magick convert -quality 50 -colorspace Gray image.heic new.heic

Images

images.zip

[fmw42]

On IM 7, you should use magick, not magick convert.

[Anicky]

Thank you for this information, I didn't know that!

Unfortunately, I just tried this command with same parameters than before and result is the same.

$ time magick image.heic -quality 50 -colorspace Gray new2.heic

real    0m12.143s
user    0m12.469s
sys     0m0.150s

The process is very slow (12s compared to 2s) and it produces a corrupted image.

[fmw42]

On my M1 Mac with 8GB RAM and IM 7.1.1.22 and libheif 1.15.2, I get

time magick image.heic -quality 50 -colorspace Gray new2.heic

real	0m4.149s
user	0m26.823s
sys	0m0.127s

The result looks fine.

new2.heic.zip

[Anicky]

Could this be a problem related to Alpine?

Or libheif maybe?

[fmw42]

What is your version of libheif?

[Anicky]

The version of installed libheif package is: 1.16.2r-0:

$ apk version libheif
Installed:                                Available:
libheif-1.16.2-r0                       = 1.16.2-r0

[fmw42]

Look for it in

magick -list format

for example I have

HEIF HEIC rw+ High Efficiency Image Format (1.15.2)

[Anicky]

Here is what I have:

$ magick -list format | grep HEIF
     HEIF  HEIC      rw+   High Efficiency Image Format (1.16.2)

[fmw42]

That version should be fine unless it has a bug. It worked fine for me on my Mac with 1.15.2.

IM 7.1.1-13 is a bit old. Perhaps it had a bug. Try upgrading to the current version.