[Dimensions] Crop & Ratio

I just created some travel poster images as .png files in midjourney and now using gigapixel for the first time.

After exporting my first image into gigapixel I wanted the image to be A1 size or 24x32 inches at 300dpi. When I try to modify the size to 24x32 inches - gigapixel then defaults to 24x24 inches. Am I doing something wrong here?

Ultimately I am trying to create separate images of the same image imported from midjourney at different size formats ready for printing. Or should I just tidy up image in gigapixel and then do the sizing in photoshop saving as a JPEG.

The dimension sizing in Gigapixel locks the ratio.
If you import an image with an 1:1 ratio and adjust the dimensions, the width will match the height.

If you want a different resulting ratio than what was imported, you’ll need to crop the image to the desired ratio first. A 3:4 ratio would result in dimensions of 24x32in.