Check out http://zone.ni.com/devzone/cda/epd/p/id/2201 if you want to use the zoom function of the picture (all layers will be scaled).
Or this one http://zone.ni.com/devzone/cda/epd/p/id/2240 to use array operations. Don't expect nice filtering! The vi probably uses the nearest pixel.
If you want to trunc the image, use "Get Image Subset.vi".
This one is also fun: http://zone.ni.com/devzone/cda/epd/p/id/1943 , if you ever want to rotate the image.
Getting the dimensions from a picture is easy. If it's a pixmap, you can use unbundle to get the rect. If it's an unflattened picture, it's a 2D array, so use array size to get it's dimensions.
Regards,
Wiebe.
