Scaling Image keeping aspect ratio - GIMP 2.10 Plug-in

 This chunk of code will scale image height to 600px while keeping aspect ratio

# Scale image while keeping aspect ratio orig_width, orig_height = image.width, image.height new_height = 600 new_width = int((orig_width / float(orig_height)) * new_height) pdb.gimp_image_scale(image, new_width, new_height)