Handling of images exceeding maximums need to be friendlier and more informative

[Scott Cowles Jacobs]

I have been working (with Hugin) on images that can get rather long (or high, presumably).

I had a problem with my Blu-Ray player not showing an image that seemed almost identical to one id did show, and thought I'd try to see what was different about the two...

I used identify to try and see the specs of the respective images, and was surprised to see an "error" message about width or height exceeding maximums.

I eventually found that I could modify policy.xml to increase the size maximums, but only after googling and searching around. Nothing printed in the terminal indicated that I could do anything about solving the problem myself, and that it was not in fact a bug.

Display was even worse - When I selected it from the context menu, the ImageMagick logo and wizard were shown, but nothing else ever happened.

I think some sort of window or text (depending on whether the programs were launched from the terminal or GUI), should appear that either directly suggests changing policy.xml, or lists a website that tells/shows how to solve the issue.

Not saying something seems to tell the user that the program has a bug, or that there is nothing to be done about the problem.

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scott@scott-Asus-M2N68-AM-PLUS:~$ uname -a
Linux scott-Asus-M2N68-AM-PLUS 4.13.0-32-generic #35-Ubuntu SMP Thu Jan 25 09:13:46 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
scott@scott-Asus-M2N68-AM-PLUS:~$ lsb_release -dsc
Ubuntu 17.10
artful
scott@scott-Asus-M2N68-AM-PLUS:~$ echo $DESKTOP_SESSION
QLubuntu

scott@scott-Asus-M2N68-AM-PLUS:~$ apt-cache policy imagemagick-6.q16
imagemagick-6.q16:
  Installed: 8:6.9.7.4+dfsg-16ubuntu2
  Candidate: 8:6.9.7.4+dfsg-16ubuntu2
  Version table:
 *** 8:6.9.7.4+dfsg-16ubuntu2 500
        500 http://us.archive.ubuntu.com/ubuntu artful/main amd64 Packages
        100 /var/lib/dpkg/status

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ProblemType: Bug
DistroRelease: Ubuntu 17.10
Package: imagemagick-6.q16 8:6.9.7.4+dfsg-16ubuntu2
ProcVersionSignature: Ubuntu 4.13.0-32.35-generic 4.13.13
Uname: Linux 4.13.0-32-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.20.7-0ubuntu3.7
Architecture: amd64
CurrentDesktop: LXQt
Date: Thu Feb 8 15:28:03 2018
InstallationDate: Installed on 2017-11-06 (94 days ago)
InstallationMedia: Lubuntu-Next 17.10 "Artful Aardvark" - Beta amd64 (20171014)
SourcePackage: imagemagick
UpgradeStatus: No upgrade log present (probably fresh install)