updating from image v0.24 to image v0.25 is causing colour distortions

[lovasoa]

Hello !

I don't have the time to investigate more deeply on this, but I wanted to let you know. Updating from image-rs v0.24 to v0.25 causes serious color distortions in decoded jpeg images.

This can be reproduced by compiling dezoomify-rs against the two different versions of image-rs.

I fixed the issue in dezoomify-rs by downgrading image-rs, but I thought this may be worth sharing here.

The detailed reproduction steps are here: lovasoa/dezoomify-rs#259 (comment)

My best guess is that image tiles like these are not decoded properly: tiles.zip

[lovasoa]

Interesting, and may be relevant: the gnome file browser image previews are also decoded with incorrect colors, but the gnome image viewer gets the right colors (same as image-rs v0.24):

[lovasoa]

The problem may come from the embedded color profile in the image (Prophoto RGB) which was correctly interpreted in v0.24 and ignored in v0.25.

Here is the output of imagemagick identify:

$ identify -verbose /tmp/original-server-tile.jpg 
Image:
  Filename: /tmp/original-server-tile.jpg
  Permissions: rw-r--r--
  Format: JPEG (Joint Photographic Experts Group JFIF format)
  Mime type: image/jpeg
  Class: DirectClass
  Geometry: 512x512+0+0
  Units: Undefined
  Colorspace: sRGB
  Type: TrueColor
  Base type: Undefined
  Endianness: Undefined
  Depth: 8-bit
  Channels: 3.0
  Channel depth:
    Red: 8-bit
    Green: 8-bit
    Blue: 8-bit
  Channel statistics:
    Pixels: 262144
    Red:
      min: 32  (0.12549)
      max: 243 (0.952941)
      mean: 207.67 (0.814391)
      median: 214 (0.839216)
      standard deviation: 20.2158 (0.0792778)
      kurtosis: 18.5473
      skewness: -3.903
      entropy: 0.620616
    Green:
      min: 24  (0.0941176)
      max: 240 (0.941176)
      mean: 197.969 (0.77635)
      median: 206 (0.807843)
      standard deviation: 23.8466 (0.0935161)
      kurtosis: 13.2825
      skewness: -3.14624
      entropy: 0.714602
    Blue:
      min: 16  (0.0627451)
      max: 227 (0.890196)
      mean: 178.239 (0.698975)
      median: 184 (0.721569)
      standard deviation: 19.1504 (0.0750995)
      kurtosis: 21.8043
      skewness: -3.9469
      entropy: 0.676309
  Image statistics:
    Overall:
      min: 16  (0.0627451)
      max: 243 (0.952941)
      mean: 194.626 (0.763239)
      median: 201.333 (0.789542)
      standard deviation: 21.0709 (0.0826311)
      kurtosis: 17.878
      skewness: -3.66538
      entropy: 0.670509
  Rendering intent: Perceptual
  Gamma: 0.454545
  Chromaticity:
    red primary: (0.64,0.33,0.03)
    green primary: (0.3,0.6,0.1)
    blue primary: (0.15,0.06,0.79)
    white point: (0.3127,0.329,0.3583)
  Matte color: grey74
  Background color: white
  Border color: srgb(223,223,223)
  Transparent color: black
  Interlace: None
  Intensity: Undefined
  Compose: Over
  Page geometry: 512x512+0+0
  Dispose: Undefined
  Iterations: 0
  Compression: JPEG
  Quality: 76
  Orientation: Undefined
  Profiles:
    Profile-exif: 40 bytes
    Profile-icc: 868 bytes
  Properties:
    comment: (C) Google Inc.
    date:create: 2024-09-25T09:24:48+00:00
    date:modify: 2024-09-25T09:24:48+00:00
    date:timestamp: 2024-09-25T13:02:32+00:00
    exif:Software: Picasa
    icc:copyright: Copyright (c) Eastman Kodak Company, 1999, all rights reserved.
    icc:description: ProPhoto RGB
    icc:manufacturer: KODAK
    icc:model: Reference Output Medium Metric(ROMM)
    jpeg:colorspace: 2
    jpeg:sampling-factor: 1x1,1x1,1x1
    signature: 1d40f53ad2a16840aa7c4f4fdfb06e4e361710ea69ce3afdf24d102118c0f48c
  Artifacts:
    verbose: true
  Tainted: False
  Filesize: 25514B
  Number pixels: 262144
  Pixel cache type: Memory
  Pixels per second: 31.0766MP
  User time: 0.010u
  Elapsed time: 0:01.008
  Version: ImageMagick 7.1.1-33 Q16-HDRI x86_64 22263 https://imagemagick.org

original tile	tile with the embedded color profile stripped

[sxyazi]

Seems a duplicate of #2247