[Bug 1594060] [NEW] abort when writing rgf format

[David Lechner]

Public bug reported:

rfg is an image format used on LEGO MINDSTORMS EV3.

When trying to convert an image to the rgf format, the program aborts.

Example

$ convert mindstorms.bmp mindstorms.rgf 
convert: ../../coders/rgf.c:345: WriteRGFImage: Assertion `exception != (ExceptionInfo *) NULL' failed.
Aborted (core dumped)

** Affects: imagemagick (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: imagemagick (Debian)
     Importance: Unknown
         Status: Unknown

** Attachment added: "Image used for testing"
   https://bugs.launchpad.net/bugs/1594060/+attachment/4686436/+files/mindstorms.bmp

** Bug watch added: Debian Bug tracker #827643
   http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=827643

** Also affects: imagemagick (Debian) via
   http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=827643
   Importance: Unknown
       Status: Unknown

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https://bugs.launchpad.net/bugs/1594060

Title:
  abort when writing rgf format

Status in imagemagick package in Ubuntu:
  New
Status in imagemagick package in Debian:
  Unknown

Bug description:
  rfg is an image format used on LEGO MINDSTORMS EV3.

  When trying to convert an image to the rgf format, the program aborts.

  Example

  $ convert mindstorms.bmp mindstorms.rgf 
  convert: ../../coders/rgf.c:345: WriteRGFImage: Assertion `exception != (ExceptionInfo *) NULL' failed.
  Aborted (core dumped)

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