plotting only black and white pixel values on Histogram

Hello Everyone,

Could someone please help out?

I trying to plot black and white pixel values of a picture on Histogram in Matlab.

in other words, showing the image with all non-black pixels set to white. This would mean just leaving the pixels with a value of 0 (black) and setting all others to 255 (white).

Many thanks

[Adam]

Seems like simply a case of some logical masking. e.g.

myImage( myImage ~= 0 ) = 255;

Then run a histogram on the result.