[Bug 41759] Re: "Alien Glow" effect crops too tightly

[era]

** Description changed:

  Creating a simple text logo with this effect with the default parameters
- (150-pixel glow) creates an image which has very a very visible bounding
- box.
+ (150-pixel glow) creates an image which has a very visible bounding box.
  
  http://laku19.adsl.netsonic.fi/~era/tmp/fnord.png is a quick example.
  
  1. Create a new GIMP document with suitable dimensions, something like 256x92 pixels
  2. Type some text in a suitable typeface and size
  3. Apply the effect: Script-Fu > Alpha to Logo > Alien Glow
  ... I selected a different color but kept the 150-pixel radius
  ... Notice how as the last step, the plug-in effect crops the image to much smaller than it was
  ... Optionally, you can even resize the canvas to a bigger one after the plug-in finishes, but unfortunately, this does not reveal the cropped parts -- they are gone for good
  4. Delete the background layer so only the original text layer and the Glow layer remain
  
  Desired result:
  
  An image with "glowing" text suitable for inclusion on a web page
  without disturbing artefacts
  
  Actual result:
  
  The cropping of the "glow" color makes it very clear that you are
  looking at a distinct image; the bounding box of the image are very
  clearly discernible. The illusion of a piece of glowing text on a page
  is simply not there because the glow does not gradually fade to the
  background of the page.
  
  This is in Gimp 2.0 on stock amd64 Breezy.

-- 
"Alien Glow" effect crops too tightly
https://launchpad.net/bugs/41759