The picture is:
How do I isolate the green chips? The result must be in black and white. It doesn't have to be perfect.
To isolate the blue ones I used:
I=imread('Picture.png'); A=I(:,:,3); B=(A>230) figure imshow (B)
How do I isolate i)Green ii)Yellow
Colours are represented by their RGB values. I don't know much about Matlab, but I suppose you could simply search online for the RGB values of different shades of green and yellow and create a numerical range of colours that match as green or yellow.
There are softwares where you can upload your picture, click on a series of pixels and get an approx. range of RGB values for them.