[Bug 1599216] [NEW] Alpha channel not preserved with -liquid-rescale

[G.M.]

Public bug reported:

Running:
 for i in *.png ; do convert -liquid-rescale 'x40' $i png8:`basename $i .png`.small.png ; done
does NOT preserve alpha channel

 for i in *.png ; do convert -resize 'x40' $i png8:`basename $i .png`.small.png ; done
does preserve alpha channel (but totally blurs the image...)

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

** Description changed:

  Running:
-  for i in *.png ; do convert -liquid-rescale 'x40' $i png8:`basename $i .png`.small.png ; done
+  for i in *.png ; do convert -liquid-rescale 'x40' $i png8:`basename $i .png`.small.png ; done
  does NOT preserve alpha channel
  
-  for i in *.png ; do convert -resize 'x40' $i png8:`basename $i .png`.small.png ; done
- does preserve alpha channel
+  for i in *.png ; do convert -resize 'x40' $i png8:`basename $i .png`.small.png ; done
+ does preserve alpha channel (but totally blurs the image...)

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https://bugs.launchpad.net/bugs/1599216

Title:
  Alpha channel not preserved with -liquid-rescale

Status in imagemagick package in Ubuntu:
  New

Bug description:
  Running:
   for i in *.png ; do convert -liquid-rescale 'x40' $i png8:`basename $i .png`.small.png ; done
  does NOT preserve alpha channel

   for i in *.png ; do convert -resize 'x40' $i png8:`basename $i .png`.small.png ; done
  does preserve alpha channel (but totally blurs the image...)

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