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<body class='hmmessage'><div dir='ltr'><font face="Calibri,sans-serif" color="#000000">Hi,</font><div><font face="Calibri,sans-serif" color="#000000"> I have installed QGIS 2.8.1.</font></div><div><font face="Calibri,sans-serif" color="#000000">OS: Windows 7</font></div><div><font face="Calibri,sans-serif" color="#000000"><br></font></div><div><font face="Calibri,sans-serif" color="#000000">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. </font></div><div><font face="Calibri,sans-serif" color="#000000"><br></font></div><div><font face="Calibri,sans-serif" color="#000000">Please help me.</font></div><div><font face="Calibri,sans-serif" color="#000000">Thank you,</font></div><div><font face="Calibri,sans-serif" color="#000000">Poom.</font></div> </div></body>
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