Is it possible to downsize a large image on the server side (before serving it to the user)?

One of the banes of my existence is resizing the same image several times because of the various contexts it appears in. For example, the main image in an article will appear bigger than it will on the index page, where many article teasers are placed. Then there's the image that goes in the Facebook "share" og. Then there's... you get the idea.
Same image, different contexts, lots of Photoshop resizing, lots of files to keep track of... but I save on bandwidth.
On the flip side, I can target the same (large) image and simply downsize via traditional HTML (width/height) on the browser end, but that will mean downloading a file that is 50-75% larger than what is actually needed. If the front page teaser displays a 1280px image at 500px, that's a huge (and potentially costly) waste of bandwidth.
HOWEVER...
If I could do the same thing on the SERVER side... in other words, tell the server to take only the pixels it needs from the (large) image and serve only THOSE to the end user... then the same image could be used in each and every context, and only the necessary bandwidth is used.
Is this do-able? If so, what is the process formally called, and where would I begin to learn how to do it?
Thanks!

That's amazing. I didn't think it was possible without saving files on the server first.
This will suit my needs just fine, but allow me to push my luck even further with the following "hail mary" question : would it be possible for the server to serve the PNG with a width of 100% of the container? In other words, the behavior would mimic width=100% but the server would still only serve as many bytes as are needed to fill that space.
Not only would I not have to create separate files for every resize (we fixed that problem with your suggestion) but I wouldn't even have to customize every link to a specific size.
I'm not expecting an affirmative on this one, but it was worth asking. =)

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