Hi Tom, NB forgot to mention that I'm using v2.4. The original method I was trying was selecting the "visible range" check box beneath the colour table button on the Display tab of the Dashboard, which un-greys-out the "Change" button next to it, and using that button to change the visible range. No joy. I tried your method but it fails in the same way as my original method -- see attached pic. Your example picture is exactly what I'm trying to achieve so I'm at a loss as to why it's not working for me! I do wonder if this problem is in some way tied to the sat pic I'm using, which is a MSG image. It only displays if I use the "MSGT" projection -- switching to a different projection, such as the predefined Europe projection for a more top-down view, causes the satellite picture to disappear (all the other displays remain). To test that I recreated something similar to your example image (using 2.5 deg data to save time, hence the blockiness!). Using my original "visible range" method has the desired result (see second attachment). I also tried your method, which also worked. (BTW note the odd bug in the second image with the display list text -- it's hidden behind the satpic. This again seems related to the projection: I was using the predefined US CONUS projection. The display list appeared normally using "World" or "North Pole".) Dan On 4/20/08, Tom Whittaker <whittaker@xxxxxxxx> wrote: > Hi Dan -- > > I assume from your description that you tried to do a "change range" > on the theta-e plot. In my example, the original range was > 250-420K.....so perhaps you just tried changing the range to something > like 310-420K or something? > > The behaviour of this is that it then treats all values from 250-309 > as if there were equal to 310, for the purpose of mapping from the > data to the color table. > > The way I know of to accomplish this is to edit the color table, click > on the "Transparency" radio button, set the transparency to 100%, and > then grab the slider above the "250" and drag it to the right (you > should see black/white checkboard pattern). You will then get > something like the attached (I hope) image. > > Hope that helps... > > tom > > > On Sun, Apr 20, 2008 at 12:42 PM, Dan Grey <dangrey@xxxxxxxxx> wrote: > > I've got a sat pic (from a server under "Images") on the surface, and > > a colour-shaded plot of theta-e at 850 hPa from the GFS above. I > > restrict the visible range of the theta-e to a value so only areas > > above a certain value are shown (to illustrate a plume event). However > > areas with theta-e below my range appear black, rather than showing > > through the sat pic below. > > > > Am I missing something simple, is this is intended behaviour, or is it a > bug? > > > > > > Dan
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