Le 30/08/2012 17:30, Patrick Giraudoux a écrit :
Hi,
I am working with QGIS 1.8.0 lisboa, and have imported a raster into
GRASS 6.4.2 via the QGIS interface (it was a TIF file originally).
To my surprise null values are not displayed "transparent" in QGIS but
at the equivalent of zero in the coloramp. However, I have checked
that the values of the cells are really "null" when pointed on with
the appropriate tool.
When displayed within GRASS (tcltk interface) everything is OK and
null is transparent.
Any idea about what happens?
Patrick
Multiplying the raster by 1.0 in grass (r.mapcalc) solved the problem.
The new map now has null values recognised by QGIS and so displayed
transparent.
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