: Autoshrink with aspect ratio Is there any simple way to autocrop/autoshrink a square image in GIMP, but without changing aspect ratio? Basically the autoshrinking would stop once it's no longer

@Carla748

Here's my solution:

(define (square image drawable)
(gimp-image-undo-group-start image)
(gimp-context-push)
(plug-in-autocrop 1 image drawable)
(let* (
(width (car (gimp-image-width image)))
(height (car (gimp-image-height image)))
(newWidth width)
(newHeight height)
(layer (vector-ref (cadr (gimp-image-get-layers image)) 0))
)

(if (< width height)
(set! newWidth height)
)
(if (> width height)
(set! newHeight width)
)

(gimp-image-resize image newWidth newHeight (/ (- newWidth width) 2) (/ (- newHeight height) 2))
(gimp-layer-resize-to-image-size layer)

(gimp-image-clean-all image)
(gimp-context-pop)
(gimp-image-undo-group-end image)
(gimp-displays-flush)

(list newWidth newHeight)
)
)
(script-fu-register
"square"
"<Image>/Tools/Square"
""
"Matthew Morrone"
"Uncopyright 2016 Matthew Morrone"
"27 September 2016"
"*"
SF-IMAGE "Input Image" 0
SF-DRAWABLE "Input Drawable" 0
)

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@Lee3735518

Duplicate layer
Autocrop copy
Figure out the size and offsets of a potential square crop of the layer from the cropped width, height and offsets.
remove copy
crop the original layer using gimp-layer-resize


Something like this:

# -*- coding: utf-8 -*-
#!/usr/bin/env python

import os, sys
from gimpfu import *

def squareCrop(image,layer):
pdb.gimp_image_undo_group_start(image)

try:
x0,y0=layer.offsets

# get size and offsets of fully autocropped layer
copy=layer.copy()
image.add_layer(copy)
pdb.plug_in_autocrop_layer(image,layer)
xC,yC=copy.offsets
hC,wC=copy.height,copy.width
image.remove_layer(copy)

# determine padding direction
topBottomPad=wC > hC
pad=abs(hC-wC)/2

# determine size and offsets for resize
xOff,yOff=(x0-xC,y0+pad-yC) if topBottomPad else (x0+pad-xC,y0-yC)
w,h=(wC,wC) if topBottomPad else (hC,hC)

layer.resize(w,h,xOff,yOff)

except Exception as e:
print e.args[0]
pdb.gimp_message(e.args[0])

pdb.gimp_image_undo_group_end(image)

### Registrations
whoiam='n'+os.path.abspath(sys.argv[0])

register(
'square-crop',
'Square crop'+whoiam,
'Square crop',
'Ofnuts','Ofnuts','2016',
'Square crop...',
"RGB*",
[
(PF_IMAGE, "image", "Input image", None),
(PF_DRAWABLE, "drawable", "Input drawable", None),
],
[],
squareCrop,
menu="<Image>/Layer/Transform",
)

main()


Note you cannot crop that way if you are too close to a border, because the padding would extend beyond the canvas limits (something which isn't checked by the code above)

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