Output .avif file seems washed out

[everthis]

ImageMagick version

7.1.1-32

Operating system, version and so on

OS: Ubuntu 22.04.3 LTS x86_64

Description

$ magick -version
Version: ImageMagick 7.1.1-32 Q16-HDRI x86_64 22207 https://imagemagick.org
Copyright: (C) 1999 ImageMagick Studio LLC
License: https://imagemagick.org/script/license.php
Features: Cipher DPC HDRI OpenMP(4.5)
Delegates (built-in): fontconfig freetype heic png x xml zlib
Compiler: gcc (11.4)

magick hdr.avif -resize 50% out.avif

The hdr.avif is from
https://raw.githubusercontent.com/AOMediaCodec/av1-avif/master/testFiles/Netflix/avif/hdr_cosmos01650_cicp9-16-9_yuv444_full_qp10.avif

The screenshot below is comparison of original hdr.avif(left) and out.avif(right).
It's obvious that the output file is not expected.
Am I missing something?

[fmw42]

I get the same result on IM 7.1.1.32 on Mac OSX Ventura.

[snibgo]

The screenshot below ...

What software did you use to read the file and display the image?

When I use Gimp, the result looks like the "washed-out" image.

[everthis]

Chrome, which support avif files.

[fmw42]

How was the image captured? Was there any processing done? If from a camera, was the information about auto-brightness lost. I do not see any camera information in the verbose information.

[everthis]

It was captured using windows screen capture tool.And HDR mode in Windows is turned on.

[fmw42]

Sounds like you may have lost information about the original when you did a screen capture. Can you send the original before the screen capture?

[everthis]

https://raw.githubusercontent.com/AOMediaCodec/av1-avif/master/testFiles/Netflix/avif/hdr_cosmos01650_cicp9-16-9_yuv444_full_qp10.avif

[everthis]

And I think it’s not about screenshot. I took the screenshot because the output is abnormal. The screenshot is just a way to show the difference.

[everthis]

Tried with MacOS 14.2.1 (23C71)

Version: ImageMagick 7.1.1-32 Q16-HDRI aarch64 22207 https://imagemagick.org
Copyright: (C) 1999 ImageMagick Studio LLC
License: https://imagemagick.org/script/license.php
Features: Cipher DPC HDRI Modules OpenMP(5.0) 
Delegates (built-in): bzlib fontconfig freetype gslib heic jng jp2 jpeg jxl lcms lqr ltdl lzma openexr png ps raw tiff webp xml zlib zstd
Compiler: gcc (4.2)

Command:

magick hdr.avif -resize 50% out.avif

The same result:

[snibgo]

I suppose the input image contains HDR information, perhaps in the form of a base SDR image, and a gain map to transform the base image to HDR.

The given command ...

magick hdr.avif -resize 50% out.avif

... reads all images from hdr.avif, then resizes those images by 50%, then writes those images to out.avif. I suppose it is reading only the SDR image from the input, and that is the only image that is written to the output.

Gimp is doing the same, reading only the SDR image.

I don't know if this is a limitation of libheif or of IM and Gimp.

[kmilos]

There is no gain map here. This is simply an issue of IM not supporting CICP color profiles (i.e. nclx box), so the converted out.avif gets tagged as sRGB by default, while the input was Rec. 2100 PQ.