[Qgis-user] Raster visibility

[Nicolas Cadieux]

Hi, 
Try stretching the image colors. (If you have a null value that became a true value (like -32768) then QGIS could try to stretch that image between -32768 and you highest value resulting in a black image on the screen until you change the stretching values. 
 Use the value plugin or histogram in the layer property to see if you have data.  If not, convert the image to a .tiff before you start and use .tiff for the ouput.  That should work. 
Nicolas Cadieux M.Sc. 
Les Entreprises Archéotec inc.  
8548, rue Saint-Denis Montréal H2P 2H2 
Téléphone: 514.381.5112  Fax: 514.381.4995 
www.archeotec.ca 
On Jul 3, 2015 01:10, "KP Rao [via OSGeo.org]" <ml-node+s1560n5214115h26 at n6.nabble.com> wrote: 

	Dear QGIS community: Recently, I tried to georeference a raster (jpg) image of an are approximately 100 x 100 mts.  After attaching the coordinate information and finishing the process in georeferencer plug in, the image is appearing completely black in QGIS window.  I wonder, whether, there is any limitation on the size of the area that can be georeferenced?  Pl  help! Prof. K.P.RAO Professor  (Ex-Director, Department of Archaeology and Museums, Govt. of A.P.)  Department of History University of Hyderabad HYDERABAD 500046  INDIA. 
[hidden email] Mobile: 9440375303 (O) Ph/Fax: 91-40-2313 3159 Home: 17.488110°N 78.315144°E   

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