So far I haven't heard of an easy way to scale photos to form lined-up diptychs, and seeing an effort where one photo was distorted, I made a free version of my diptych web page that lets you load your own pics into the browser. Once you have gone past the initial files, you can also toggle each photo with the previous one by clicking next to it. Once the page is loaded, it works standalone, tho Home and About link back to my site. The boxy icons change between side-by-side and stacked tilings. http://phobrain.com/pr/home/mypairs.html Before I wrote the diptych formatter, I was pasting pics side-by-side in email and screenshotting the part that lined up. It might be useful if people add other methods that work here, using different programs.