[Qgis-developer] Re: [Qgis-user] Problems with Raster histograms

Tim Sutton lists at linfiniti.com
Wed Dec 1 13:58:21 EST 2010


On Wed, Dec 1, 2010 at 6:42 PM, Benoit <benoit-3 at bc-consult.com> wrote:
>  Hi Agus,
> As far as I know this is so because your raster does not define a null
> value in the GDAL sense (use GDAL tools to set a null value for that
> raster, NOT the QGIS raster properties)

Yes (as extremely delayed feedback to Benoit too) I plan to rewrite
the raster histogramming at some point to not use gdal so that we can
take into account user defined transparency settings etc. I will do
this when I get a few hours to spare!



> Hope this helps,
> Benoit
> On 01/12/2010 17:14, Agustin Lobo wrote:
>> Raster histograms include null values, which in many cases severely distorts the
>> histograms (i.e., images in which a large part of ocean is present or
>> just images
>> in which the scene is not a rectangle)
>> Also, the ability to customize the axes (in particular the x axis) is
>> very important
>> See here a pict:
>> https://sites.google.com/site/openfiles2/home/histogram_problem1.jpeg
>> Agus
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