hi this is prasenjit. since I've some experience to work on ENVI, its my suggestion that first you stack the layers which u want to have the scatter plot. then open the stacked image into the display window. after that you have an option at the display menu bar which is named as "tool" . just click it, a popup appear and you can find an option 2D scatter plot. a new window opens after clicking that option. the new window gives you the option to choose the layers in X and Y axis. just choose it, I think you can get the scatter plot in the way you want. in the scatter plot window, by right clicking and holding it u can select any part of the scatter plot and simultaneously u can give any color u want and that particular color at the same time also appear in the display window of the main image. hope u find ur ways... prasenjit

You can do this with cgScatter2d from the Coyote Library: data_1 = cgDemoData(1)+ RandomU(seed, 101) * 10 data_2 = cgDemoData(1)+ RandomU(seed, 101) * 20 + 50 data_3 = cgDemoData(1) cgLoadCT, 33 cgScatter2d, data_1, data_2, COLOR=BytScl(data_3) You can learn more about the Coyote Library at Coyote's Guide to IDL Programming: http://www.idlcoyote.com/ Get the latest version! :-)

Hi, Thanks for your answer but, the cgscatter2d procedure only specifies a string/integer value for color parameter. It's not possible to put a scaled color vector. cgScatter2d, data_1, data_2, COLOR=BytScl(data_3) -> error My file has 3 columns x,y,z (x,y are positions and z meaning densities) I need to show every z value scaled in a range of colors. Now, I'm using contour plots to do it, but I need a more smoothed and realistic image. Thanks.

You don't have the latest version, which can be found here: http://www.idlcoyote.com/...rams/cgscatter2d.pro