Hi,
I am not sure if there is a bug but since you have a virtual raster, I would
look to see if they all have the same no data values. Try loading only
one raster or try saving the virtual raster as a tif and setting the no
data value. Do you have the same problem?
If Qgis does not recognize the no data value, it may be thrown out by trying to
stretch the image from -32768 to whatever you have. In that case, your
raster will not be "viewed correctly" as it is trying to display more than 256
shades which is the max a screen can handle. In that case you would see only
black and white.
Hope this help!
Nicolas
On Apr 17, 2016 8:22 AM, "Lene Fischer [via OSGeo.org]"
<ml-node+s1560n526162...@n6.nabble.com> wrote:
Hi,
I´m rehearsing my lectures for tomorrow – and using 2.14.1 on windows.
When I create a virtual raster the values are not viewed correct. Then I click
Stretch Histogram to full data. Nothing happens.
I have to go to properties and load to ‘min-max’ actual values before anything
happens.
If I use Properties >Histogram and try to Reset and then ReCompute histogram
– nothing happens…
What do I do wrong?
A bit distressed – Giving lectures in raster QGIS tomorrow …
Regard
Lene Fischer
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