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[David McKelvie <1075485@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

Start gimp
  Create a new image
  Add an alpha channel
  Draw a squiggle in black on white on image
  Run Filters/Edge-Detect/Difference of Gaussians

  Expected: image should be shown that contains edges of sqiggle
  Actual: image vanishes and is replaced by an all transparent image

Filters/Edge-Detect/Edge works as expected

Filters/Edge-Detect/Difference of Gaussians works as expected if one
removes the alpha channel from image.

GNU Image Manipulation Program version 2.6.12 : 2.6.12-1ubuntu1.1
OS Ubuntu 12.04.1 LTS
graphics card: Advanced Micro Devices [AMD] nee ATI RV710 [Radeon HD 4350]
graphics driver: fglrx

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

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https://bugs.launchpad.net/bugs/1075485

Title:
  Gaussian edge detect does not work on image with alpha channel

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