convert to flatten layered xcf gimp image yields dark lines around image

Hi. I'd like to start (my first post to the list) by saying
thanks to everyone who makes Imagemagick what it is. It
truly is one of the great OSS successes and I hope it
continues to grow and grow!
 
 My trouble is this: I'm writing a bash script to create
thumbnails for product images which are fixed up via the
GIMP.  I use the gimp to cut out the background of images.
Then I add a 2nd layer of background color, and save the
file as *.XCF with a proportion of 640x480 (or the other way
around.) I don't flatten nor do I reduce the size of the
image in the gimp as I might want to edit it again later.
I'm attempting to use convert in a shell script to flatten,
strip, risize, and convert to jpeg. This is my current line:
 convert -resize 307200 -flatten -strip -quality 70
"$i" "${i/.xcf}.jpg"
 
 I have also tried something as simple as:
 convert foo.xcf -flatten foo.jpg
 as well as:
 convert foo.xcf -flatten -background none foo.jpg
 
 My version of IM/convert is 6.0.7.
 
 These mostly works as expected in that the cutout image
from the first layer appears over its colored background
layer...except that the cutout image develops a thick black
line around it. This seems to develop from the partially
transparent edge around the cutout image in the first layer.
 
 Is there a way to flatten a GIMP image that results in
something similar to the way the GIMP does it -- that is, a
smooth gradation between the edge of the image and complete
transparency into the next layer?
 
 In my scouring of the net I came across this gem:
 "This is not PS -- it's IM." Of this fact I am
aware and in agreement. But I still want to know, is there a
way to do it "the IM way"?
 
 BTW, I've discovered that a newer version of IM/convert,
used in a similar fashion as above, refuses to perform any
"flattening" of the image at all. It seems
merely to blacken out the transparent part of the layer
containing the cutout of my  image and does not show the
lower layer at all. So I'm not sure if I should upgrade
quite yet or not..but any advice regarding either version
would be much appreciated.
 
 TIA!
 
 Mike
 Nagano, Japan

			
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