Concatenate, conjoin, meld, extract images

I'm looking to use an image of letters and numbers, whereby I
need a way to extract each letter and number to create random
strings, then combine/conjoin/meld/mesh/merge/unify/unite the
images into one one image.

Is it better to extract each individual letter from one image and
then create the new image or is it better to use 36 different
images of different names and then create the image from that?
And can anyone provide any help in this regard?

And I imagine however, that 50 selected letter sequences works
stored in 50 separate images works better and faster than having
PHP on the server do it, but that might depend upon the processor
on the server as well.

There's a word which describes what I want to accomplish but it
wants to hide in the recesses of my mind, and basically I want to
ask the end user to type in the letters in the image presented to
verify that the email coming through came through via a human
reader rather than a robot.

Thanks for any suggestions and/or comments.

Jim Carlock
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Received on Mon May 1 02:45:24 2006