Histogram is black/dark in GRASS when you change the projection or co-ordinates
I am trying hard to display the histogram in wxPython GUI. It does display the histogram when I keep the projection undefined. But, as projection changed to British National Grid (this is what it should be), histogram comes out a total dark box even though image is totally perfect with true colour in the Display window.
Near-infrared band of SPOT also has the same issue when define a projection, but rest of two bands are perfect.
I badly need to display the histogram when I define the projection of the images.
I would be grateful if anyone can help me out in this issue.