I have written a Processing sketch for the web and I would like to allow viewers to click on a button in the sketch to "save" the current frame as a file on the server (perhaps in a "gallery" for later viewing).
I realize that "saveFrame" will not work on the web.

I am wondering if anyone else has already figured out how to solve this,... perhaps going through TCP and PHP?

I know I can grab the frame as a PImage using "loadPixels", but then I am stuck.  Ideally, there should be some way to JPG encode the image (so it is smaller and in the right data format) and then I still need to send it to a server to be stored.  I am guessing this could be done by opening a TCP connection to the server running PHP that would accept an "uploaded" image file.

Although I know conceptually the steps involved, I would really love to see some example code that I could modify to suit my purpose.  There must be someone out there who has already figured out how to save a frame from a Processing applet on the web ... (and no, "screen capture to the desktop" won't be good enough.)

thanks in advance,
 djones