For a project I'm working on I need to merge many single-page tiff files into one multi-page tiff file. This is no problem unless the resolution of the tiff files are not the same. I'm able to resize the tiff files so that they all get the same size, but then some of the images get streched out. This is normal since some of them have e.g. 1888*1300 as resolution and some have 1888*650.
So I was wondering if there is a way to add white pixels to the tiff files so that the size of all the files becomes the same, but they don't loose their shape. If there is a way to get tiff files of different resolution in the same multi-page tiff, that would solve my problems too.