backgrounds

Posted by Bill Rothman on Nov 09, 2009; 7:31pm
URL: http://imagej.273.s1.nabble.com/backgrounds-tp3690498.html

Hello,
 
I acquire RGB images on which I must substract those pixels with RGB
values greater than (240,225,185).for example, ("background") and  set
them to (0,0,0) BUT leave other pixels (with my information) alone. I
guess I could write a macro, but was wondering if someone (most likely)
has done this already.
 
 I also want to increase the intensity of the dimmer untouched pixels
(intensify the low intensity pixels)  in some non-linear fashion, maybe
log scale.
 
Any feedback welcomed.
 
Thanks,
Bill