Posted by
ctrueden on
May 17, 2011; 3:04pm
URL: http://imagej.273.s1.nabble.com/Color-Pixel-Counter-plugin-tp3683486p3683489.html
Hi Jacqui,
It should be straightforward with a simple macro. You just have to decide
what the cutoff is for a pixel to be "red" etc.
Here is a quick macro:
lower = 100;
upper = 150;
green = 0;
red = 0;
yellow = 0;
black = 0;
other = 0;
for (y = 0; y < getHeight; y++) {
for (x = 0; x < getWidth; x++) {
v = getPixel(x,y);
r = (v>>16)&0xff; // extract red byte (bits 23-17)
g = (v>>8)&0xff; // extract green byte (bits 15-8)
b = v&0xff; // extract blue byte (bits 7-0)
if (r > upper && g > upper && b < lower) yellow++;
else if (r < lower && g > upper && b < lower) green++;
else if (r > upper && g < lower && b < lower) red++;
else if (r < lower && g < lower && b < lower) black++;
else other++;
}
}
showMessage("Green = " + green +
", Red = " + red +
", Yellow = " + yellow +
", Black = " + black +
", Other = " + other);
Regards,
Curtis
On Tue, May 17, 2011 at 2:01 AM, Jacqui Ross <
[hidden email]>wrote:
> Hi All,
>
> I have a person wanting to count the numbers of coloured pixels in her
> images. She has green, red and yellow and black. It's not colocalisation
> analysis that she is looking for.
>
> There seems to be a useful Plugin in development by Ben Pichette here:
>
http://imagejdocu.tudor.lu/doku.php?id=plugin:color:color_pixel_counter:startbut no plugin as such yet.
>
> Just wondering if Ben is able to let me know if this plugin is soon to be
> released or alternatively, whether there is another plugin that can do this?
> The other option I was looking at to assist her was Threshold Colour.
>
> Any assistance would be very welcome.
>
> Kind regards,
>
> Jacqui
>
> Jacqueline Ross
> Biomedical Imaging Microscopist
> Biomedical Imaging Research Unit
> School of Medical Sciences
> Faculty of Medical & Health Sciences
> The University of Auckland
> Private Bag 92019
> Auckland, NEW ZEALAND
>
> Tel: 64 9 373 7599 Ext 87438
> Fax: 64 9 373 7484
>
>
http://www.fmhs.auckland.ac.nz/sms/biru/>