> I would like to know if there is a vi that can substact 2 images, what > ia mean is that u choose une particular pixel in 2 images, and labvieu > makes the substraction of those 2 pixels >
To me, subtracting two images would imply subtracting all the pixel values of one image from the pixel values of another. This could be used for offsetting by a calibration image or to measure motion or lighting changes. This results in another image with new delta intensities for each pixel. What you describe is retrieving two pixel values as intensity values and subtracting. The first step is to retrieve the pixel intensity. I don't have IMAQ installed on my machine, but I'm certain there is a function for this. Then use the normal subtraction node to subtract the intensities. Finally, you may need to scale or normalize your intensity. Note that if you are doing monochrome, your pixels are simple intensities. If doing color, your pixel is a vector of several intensities. You can subtract them all at once, then access the elements, or you can break apart the pixel elements if you want to affect them differently or only subtract a certain subelement. Greg McKaskle
