scaling images with Script-Fu

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I have been playing around with the "gimp-drawable-transform-scale"
procedure and have written some simple scripts. However, I cannot seem
to match the defaults given by "gimp-image-scale". I thought that
these two commands would produce the same result:

(gimp-drawable-transform-scale (car (gimp-image-get-active-drawable
theImage)) 0 0 568 426 0 1 0 3 0)

(gimp-image-scale theImage 568 426)

I believe that I have the correct "default" values plugged into the
first procedure above.

I have posted the same image produced by each of these procedures here:

The full scripts for each are also posted on the web page.

There are significant differences between the two images. In
particular, the image produced by "gimp-image-scale" is smoother and
has a smaller file size.

What accounts for the difference between the two? Are the "default"
values that I have plugged into "gimp-drawable-transform-scale" not
the default values used in "gimp-image-scale"? Or is there something
included in "gimp-image-scale" that is not reflected in

(By the way, if it is at all helpful, the original image is posted here:
It's large: 2.1 MB)

I'd be grateful for any thoughts on this. Many thanks!

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