I think you are going to be out of luck with Gimp and Liquid Rescale. This has come up before see: https://discuss.pixls.us/t/liquid-rescal...gimp/35122 without any success for OSX, but you could still try the suggestions and determine for yourself.
I had a good look around at what might be available for OSX. There is Krita with the built in G'mic plugin, the java application imagej + the seam carving plugin also ImageMagick (command line).
Unfortunately each of these only support shrinking an image not expanding it.
The wonders of AI ? Plenty of wonderful scaling options on-line, none of them implement seam-carving.
Are there any Mac forums where you might get advice? There is this: https://ports.macports.org/port/gimp-lqr-plugin/ but from that pixls post not working. I use linux so I do not know. What was not mentioned in that post was the liblqr dependency https://ports.macports.org/port/liblqr/
It is a great shame that Apple makes it so difficult to run Gimp.
I had a good look around at what might be available for OSX. There is Krita with the built in G'mic plugin, the java application imagej + the seam carving plugin also ImageMagick (command line).
Unfortunately each of these only support shrinking an image not expanding it.
The wonders of AI ? Plenty of wonderful scaling options on-line, none of them implement seam-carving.
Are there any Mac forums where you might get advice? There is this: https://ports.macports.org/port/gimp-lqr-plugin/ but from that pixls post not working. I use linux so I do not know. What was not mentioned in that post was the liblqr dependency https://ports.macports.org/port/liblqr/
It is a great shame that Apple makes it so difficult to run Gimp.