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image calibration labview

I am trying to calibrate an image using a grid, for non linear calibration. I have firstly a program that works when just reading from two files. but when i try to convert this to a vi that snaps the grid and then learns the calibration, saves the image to file(.PNG). Then the image that needs to be calibrated is taken and calibrated against the image of the grid saved. help!
The error for imaq set calibration is "incompatible image size"
see the two versions below, the first one works the second does, any alteration would be much appreciated.
brendanbarry@campus.ie
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