Author:	Bob Dougherty (rpd@optinav.com)
Installation:	Download Band_Pass.classs or Band_Pass.java and place it in the Plugins folder.
Description:	ImageJ plugin to isolate pixels in an RGB image or stack with a certain range of hue.  This is a little like applying a band pass filter, except that each pixel is effectively assumed to represent a source with only one wavelength. A dialog asks the user to input the lower and upper hue limits for the pass band.  These can be found by converting a test image to a Hue, Saturation, Brightness stack (Image -> Type -> HSB Stack) and experimenting with the threshold limits for the Hue slice with Image->Adjust->Threshold. A plugin to address this problem was requested by F Javier Diez-Guerra, and this type of approach was suggested by Joachim Walter.
ImageJ:	ImageJ can be freely downloaded from the ImageJ web site.