[Qgis-user] How to create a clipped grayscale raster with pixel values of 0 only on the unclipped areas

[Carlos Cerdán]

Hi Andrea:

I think you can use raster calculator and divide your clipped raster by a
mask raster. The mask raster has 1 value inside your area of interest and 0
value outside, so:

INSIDE: non 0 value / 1 = non 0 value; and 0 / 1 = 0

OUTSIDE: 0 or non 0 value / 0 = ¿null?

Greetings

Carlos Cerdán


2014-07-02 8:25 GMT-05:00 Andrea Acinelli <aacinelli at gmail.com>:

> Hi everyone,
>
> I was hoping to get some help with the following problem. I'm working with
> a grayscale georeferenced and clipped raster (.tif). The raster has been
> clipped with the 'clipper' tool using a shapefile as a mask. The resulting
> raster has black bands of color along the four edges which can be turned
> off by assigning 0 pixel values to NO DATA values in the transparency tab
> of the raster properties. The problem I have is that many other pixels
> within the clipped area have 0 value which are also turned off. How can I
> obtain a final raster that has 0 values only outside the clipped area?
>
> I'm using:
> QGIS standalone installer version 2.4 (64bit)
> Windows 7 Professional
> Service Pack 1
> Intel Core Duo CPU E6850 @3.00GHz 2.99GHz
> 8 GB RAM
> 64-bit OS
>
> Many Thanks
>
> Andrea
>
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