Re: [ImageJ 1.3.1_13] image calculator question
Posted by Wayne Rasband on Oct 07, 2005; 5:14pm
URL: http://imagej.273.s1.nabble.com/ImageJ-1-3-1-13-image-calculator-question-tp3704729p3704730.html
> what actually gives "32-bit Result" in Image Calculator window? Does
> it scale floating point result of division??
What it does is convert both source images to 32-bit floating point and
then it does the division. No scaling is done.
> It seems to me that this option scales every R/G/B channel separately
> because I get result as grayscale. I'm interested in exact
> mathematical meaning of this option in ImageJ.
You get a grayscale result because the RGB source images are converted
to 32-bit grayscale when "32-bit Result" is checked. Convert the source
images to 3-slice stacks using Image>Type>RGB Stack and the image
calculator will do the calculations separately on the 3 channels.
-wayne