I just finished re-calibrating my display using ArgyllCMS and my Pantone Huey, and I would like to validate somehow that I've done it correctly. How can I do so simply, without buying more stuff?
(I've done some Googling, which reveals tons of test images and instructions, and I'm having a hard time cutting through the pile.)
I don't have a printer and use online services for printing.
Edit: I'm not looking for anything terribly precise, just a sanity check. For example, one test image says something like "you should be able to distinguish all the blacks down to number N".
Another way of expressing the question might be: is it worthwhile to download one of those test images, and if so, which one?