Hi, I am new to IDL and I have the following problem. I would like to plot the intensity, measured by a photodiode, versus wavelength and an additional parameter, i.e. pumping power. The intensities, which are arranged in a 2-dimensional matrix, should be plotted as density plot. Afterwards I would like to change the color map of the image, the contrast, etc., and I would like to measure profiles at different points in the image. Which routine should I use for plotting the data. First I tried "contour", but I was not able to perform the image processing tasks I described above. If I use TVSCL, I get an image, but I have no axes, which I need for plotting the data. Is there some other way to plot the data? Thanks a lot for your support, Markus.