If you're a user of Picasa Web Albums, you probably know about the awesome feature of showing all photos that include a selected person. What you may not know is that, with a little tweak, you can show photos that include two (or more) people you chose. This is great e.g. for creating an album with only pictures of you and your friend, then creating a nice collage and making a great birthday gift!
So, how do you create such a filter? Notice that, when you view photos of one person, the URL of the webpage looks like this:
http://picasaweb.google.com/lh/view?uname=<username>&isOwner=true&subjectids=<long hash>#.I don't think this is documented anywhere, but the subjectids parameter is actually a comma-separated list -- you just don't see it, because it has only one element. So, all you have to do is copy the <long hash> part from views of two (or more) different persons and combine it into one URL:
http://picasaweb.google.com/lh/view?uname=<username>&isOwner=true&subjectids=<long hash 1>,<long hash 2>#And that's it! You can then easily download all photos in the album by opening its RSS feed (there's a small RSS link in the lower-right corner of the website) and downloading all photos, e.g. with FlashGot Firefox Extension. Here's how the header of three-people filter looks like:
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