Count the percentage of black and white pixels in an RGB-converted-to-grayscale image

bwratio.matlab

filename = 'irregular.bmp';
RGB = imread(filename);
grayscale = rgb2gray(RGB);

numTotalPixel = size(grayscale,1) * size(grayscale, 2);
numBlackPixel = sum(grayscale(:)==0);
numWhitePixel = sum(grayscale(:)==255);

percentBlackPixel = numBlackPixel / numTotalPixel * 100;
percentWhitePixel = numWhitePixel / numTotalPixel * 100;

if numBlackPixel+ numWhitePixel ~= numTotalPixel
    disp 'Error\n'
else
    sprintf('black pixel: %.2f%%, white pixel: %.2f%%\n', percentBlackPixel, percentWhitePixel)
end

informative