Enlarge image canvas with gimp_image_resize procedure

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I need to enlarge the area of an image using one of the available GIMP’s procedures. So, instead of using the GIMP’s graphical interface and this tool http://docs.gimp.org/en/gimp-image-resize.html, I want to be able to have the same effects on a C code.


The function that should be called is this one, right? http://oldhome.schmorp.de/marc/pdb/gimp_image_resize.html


But it works when I need to shrink the canvas: on a 640x480 image, if I input smaller values the canvas is actually cut. Instead, if I want to add a 20px transparent border along the area (so I type 680 and 520 px, also with consistent offset values), the function just returns the original image.


How does it work? Thanks

Ale
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