Typically you would update an Image Display control from a subVI using the Value property nodes. However, this method does not currently work with LabVIEW 7 and Vision 7, but the issue will be resolved in the next release of LabVIEW and Vision.
In the meantime, in addition to the solution you found you could also use a global variable to pass images from one VI to another. Using a global variable works, but not in the same way as a reference or property node would. With a reference or property node, you can pass a reference of the control to a subVI and have the subVI update the control's image. Using global variables, the subVI will update the global variable with the new images, but you need a loop monitoring the global variable in your top level VI. I hope this helps! Best wishes. Regards, Dawna P. Applications Engineer National Instruments
