Quoting Didier Bretin <did...@bretin.net>:

> I'm improving my script, and I would like to use the function
> gimp-image-scale and specify widht and height in pourcent, not in pixel.
> Do you know how I can specify pourcent ?

You need to calculate the pixel values manually.

(gimp-image-scale image
                   (* (car (gimp-image-width image)) x-pct 0.01)
                   (* (car (gimp-image-height image)) y-pct 0.01)

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