[Pkg-gmagick-im-team] Bug#1124368: imagemagick 7.1.2-9 ignores resolution if units undefined

[Jeff]

Source: imagemagick
Version: 8:7.1.2.12+dfsg1-1
Severity: serious
Justification: break debci
affects: src:gscan2pdf

Behaviour since 7.1.2-9 is to ignore the resolution if the units are 
undefined, rather than assume one of the likely units.

magick -units Undefined -density 300 xc:white test.jpg
identify -verbose test.jpg

returns

Image:
   Filename: test.jpg
   Permissions: rw-r--r--
   Format: JPEG (Joint Photographic Experts Group JFIF format)
   Mime type: image/jpeg
   Class: PseudoClass
   Geometry: 1x1+0+0
   Units: Undefined
   Colorspace: Gray
   Type: Grayscale
   Base type: Undefined
   Endianness: Undefined
   Depth: 12/16-bit
   Channels: 2.0
   Channel depth:
     Gray: 16-bit
   Channel statistics:
     Pixels: 1
     Gray:
       min: 4095  (1)
       max: 4095 (1)
       mean: 4095 (1)
       median: 4095 (1)
       standard deviation: 0 (0)
       kurtosis: 0
       skewness: 0
       entropy: 0
   Colormap entries: 4096
   Colormap:
   Rendering intent: Undefined
   Gamma: 0.454545
   Matte color: grey74
   Background color: white
   Border color: srgb(223,223,223)
   Transparent color: black
   Interlace: None
   Intensity: Undefined
   Compose: Over
   Page geometry: 1x1+0+0
   Dispose: Undefined
   Iterations: 0
   Compression: JPEG
   Quality: 92
   Orientation: Undefined
   Properties:
     date:create: 2025-12-20T18:23:06+00:00
     date:modify: 2025-12-20T18:23:06+00:00
     date:timestamp: 2025-12-20T18:23:12+00:00
     jpeg:colorspace: 1
     jpeg:sampling-factor: 1x1
     signature: 
ea0eb021dc2ad082eb7325b55ba9a512899156fc727e9c318c8ee581965fd5b0
   Artifacts:
     verbose: true
   Tainted: False
   Filesize: 160B
   Number pixels: 1
   Pixel cache type: Memory
   Pixels per second: 4404P
   User time: 0.000u
   Elapsed time: 0:01.000
   Version: ImageMagick 7.1.2-9 Q16-HDRI x86_64 5cff2fc4f:20251128 
https://imagemagick.org

i.e. the resolution is ignored and therefore 72ppi assumed. In previous 
versions, this was not the case.

This is a change in the expected behaviour of the tool because of this, 
gscan2pdf FTBFS.

https://ci.debian.net/packages/g/gscan2pdf/testing/amd64/67393423/

and

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1124365
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