[GRASS5] NVIZ TIFF output (rotated 180 degree)

[Markus Neteler]

Hi developers,

it seems that the TIFF output of NVIZ is sometimes rotated 180 degree
depending on the display tool.

xv: ok.
display (image magick): upside down (rotated 180 degree)
gimp: upside down (rotated 180 degree)

Is there anything we can change in NVIZ to stabilize the
image orientation of the stored TIFF file?

Thanks,

 Markus