Xavier; Hi, I kind of understand your problem now! Well, there are a number of solutions for this. First you can programmatically Zoom your image to a smaller size (not the actual image but the display of it). I think there is a property for the control called Zoom (both for X and Y) This way you can have a 512X512 or 256x256 image on your control which is more manageable. Another problem for this control is that when you refresh the control it puts the scroll bars to 0,0 hence you will not be able to see the far end (after refresh)
You can also resize the image (the actual image) this does not have to be a factor of 2. You can resize to 1.5 or 0.75, the show the resized image You may say, I will lose the resolution around the area that I want to work, Then you are right!! Although you can extract a window and show it as large as you want. Another solution: Maybe you can forget about this control and show your image in a window (like Labview 6.1) I agree that value of the control does not work (I guess NI knows about this), but I use local variable and been happy with this. Another solution, don't use mouse, let the user select the ROI via some other controls and always show around that area. (Let say 100 pixels left, top, bottom, right of your window of interest) Then again all of the above depends on your application Take care Hamid +++++++++++++++++++++ Dr. Hamid R. Yazdi Federal Mogul Manufacturing technology 3935 Research park drive Ann Arbor, MI 48108 Tel: 734 222 4108
