Reducing image by summing

Posted by Samuel GRANJEAUD on
URL: http://imagej.273.s1.nabble.com/Reducing-image-by-summing-tp3698814.html

Hello !

I would like to reduce image by summing the pixel values (or averaging).
For example a reduction by a factor of 3 should reduce a 3x3 pixels
square to 1 pixel whose value is the sum of the 9 pixel values. But I am
interested in the exact value of the pixels (in a quantitation view), so
the operation should be a sum (or an average). Does anybody knows a
plugin or macro to do that or something similar ? I don't want to use
the size or scale operations since I want to keep it quantitative.

Best regards,
--Samuel