Plus function shows strangely high inaccuracy

Discussion created by 2flow on Feb 22, 2011
Latest reply on Feb 22, 2011 by 2flow
I'm using a simple plus tool to add up 2 rasters. Now, I would say that when adding upp the SUM property of the input rasters, the result should be the same as the SUM property of the output raster. However, there is a difference (error) of about 5000 on a scale of 5 million. The input rasters are floats.

What could be the cause and how to solve this??