Hi,
Try "layer@1" * -1 and not (layer@band1 * -1).
Nicolas
Le 2015-05-15 05:22, Giacomo Fontanelli-2 [via OSGeo.org] a écrit :
> Dear forum
>
> here is my problem.
>
> I've got a raster layer with pixel value ranging from -8 to -15.
>
> I found that Qgis fails when I do (layer@band1 * -1) because it
> produces a map with only NaN.
>
> I can do any operation except multiplication by a negative number.
>
> Can you help me?
>
> Thank you
>
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