Adding images in a stack

Posted by ml on Jul 07, 2009; 10:06pm
URL: http://imagej.273.s1.nabble.com/Adding-images-in-a-stack-tp3691868.html

I am currently working with fairly simple tiff image stacks that are 8 bit monochrome, and are the result of simulating beam profiles.  We want to approximate what happens when we overlap a few of the beams.  So, we want saturated pixels to stay saturated so that we can see how the screen is filling up.  

I tried using the "sum" option in the "image > stack > Z Project" menu.  However, it gives me a 32-bit image and rescales the contrast, throwing off the saturated pixels.  What I want is something that adds the pixels directly.  If they add to over 255, just set equal to 255 and keep it an 8-bit image.  Is there any way to do this easily without writing my own plug-in?

Thanks