Re: White particles

Posted by Wayne Rasband on May 21, 2008; 2:53pm
URL: http://imagej.273.s1.nabble.com/White-particles-tp3696155p3696160.html

On May 21, 2008, at 6:57 AM, Simon Roussel wrote:

> Dear Wayne,
> In binary images, ImageJ can deal with both white or black particles,
> thanks
> to some black background chexboxes in Binary/Options, after
> thresholding etc.
> However, I would find also convenient to have a black background
> option in
> Analyse Particles, to analyse white (255) particles.

You can analyze white particles by setting a 255-255 threshold. Here is
an example:

     w=512; h=512;
     newImage("Test", "8-bit Black", w, h, 1);
     setColor(255);
     for (i=0; i<200; i++) {
        makeOval(random*w, random*h, 10, 10);
        fill;
     }
     run("Select None");
     setThreshold(255, 255);
     run("Analyze Particles...", "show=Nothing display clear");

-wayne