> I defined a ROI (the line) and i took it out from the images but i can't > find the way to create an empty array of specified sizes and then to copy in > it, line by line, the ROIs i acquired.
You probably want to use Initialize Array. By default, it is for 1D arrays, but you can grow it to set the rows and columns of a 2D. You also wire up the initial value of all elements, 0 would work well for black for example. Greg McKaskle
