[Qgis-user] Raster Calculator

Mon Apr 20 05:54:48 PDT 2015

Hi,  I have installed QGIS 2.8.1.OS: Windows 7
I am trying to use the "Raster Calculator" for calculating the expression log10("image.tiff"). But I get a message saying "Expression invalid". log and ln for the same expression are working fine. I need log to the base 10. 
Please help me.Thank you,Poom. 		 	   		  
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