Well, for a simplistic, single layer, plugin. The attached is the one I use to save on a bit of bandwidth. (followed by another plugin to export to a jpeg) It scales down two-thirds and adds a bit of sharpening. Not difficult to change the scaling factor., disable the sharpening.
I suppose the issue is your multi-layer images.
..and it is python, not script-fu
In the tools menu, no parameters.
If you have lots of images to scale, then I suggest the Gimp batch plugin BIMP or non-Gimp ImageMagick in a .bat file.
I suppose the issue is your multi-layer images.
..and it is python, not script-fu
In the tools menu, no parameters.
If you have lots of images to scale, then I suggest the Gimp batch plugin BIMP or non-Gimp ImageMagick in a .bat file.