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[ale] Looking for a graphics editor or (probably) a library.

I need to take a map in jpg format (Looks like Albers projection), 
display it on a canvas and record the x,y coordinates from a series of 
mouse clicks.  What I'm trying to do is generate a rough lat/long to map 
coordinates table.

I'm fairly certain I'll have to write something but don't have any ideas 
of what library would let me display a jpg and then intercept mouse 
clicks.  Any suggestions?  Php, perl, C, C++ or maybe tcl would be OK.