Basically the program should allow a JPG file to be uploaded
Uploaded as in ftp from anywhere, or read on from a known, or user-defined, location on the PC?
and then store values read from a sensor on arduino at locations clicked on the JPG.
Store them where?
Should the application allow resizing while the image is loaded? Panning? Zooming?
The process sounds interesting, and I could develop such an application fairly quickly, and at reasonable cost, once all the details are worked out.
What is your need-to-be-done-by date?