I have a set of 5 images (PNGs) that I need to combine, vertically, into one PNG.  The result needs to be a "stacked" format, with the images left-aligned.  Although there are always 5, the dimensions of each image can differ.  (see example) I recall a post with some method to combine two images, but it was quite a while ago and I've been unable to find any reference. I'll certainly appreciate any advice on how to go about this. Thanks in advance.