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Bug#1117167: lintian: detect PNG Apple color profile non-free copyright claims



On Tue, 21 Oct 2025 12:01:03 -0400 =?UTF-8?Q?Louis-Philippe_V=C3=A9ronneau?= <pollo@debian.org> wrote:

I also have some reserves, especially in terms of compute power needed for those checks. Lintian needs to stay a tool that's relatively "cheap" to run and I would be afraid checking all the images in a package could dramatically affect runtime.

Not only that, but libraries used for parsing images are often large and tend to come with a lot of security updates (since they tend to have a lot of vulnerabilities...). Not sure we really want Lintian to depend on that :(

--
   ⢀⣴⠾⠻⢶⣦⠀
   ⣾⠁⢠⠒⠀⣿⡁  Louis-Philippe Véronneau
   ⢿⡄⠘⠷⠚⠋   pollo@debian.org / veronneau.org
   ⠈⠳⣄




Scratch that. It seems the test would be done using exiftool, which is provided by libimage-exiftool-perl:

$ exiftool FOO.png | grep -i -e copy -e licen

Since that's a perl library, there's probably a pure perl way to invoke that test, instead of using the external exiftool program.

I would still want to make sure that test is "cheap" before merging it though :)

--
  ⢀⣴⠾⠻⢶⣦⠀
  ⣾⠁⢠⠒⠀⣿⡁  Louis-Philippe Véronneau
  ⢿⡄⠘⠷⠚⠋   pollo@debian.org / veronneau.org
  ⠈⠳⣄


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