how to set the pixel values to 1 and o's based on some threshold values

Eg. if redpixel>th and redpixel>green and greenpixel>blue then mark all the pixel values as 1 otherwise to 0

Answer 1

[Guillaume]

binaryimage = rgbimage(:, :, 1) > threshold         ... red pixels greater than threshold
              &                                     ... AND
              rgbimage(:, :, 1) > rgbimage(:, :, 2) ... red greater than green
              &                                     ... AND
              rgbimge(:, :, 2) > rgbimage(:, :, 3); ... green greater than blue

Or in one line:

binaryimage = rgbimage(:, :, 1) > threshold & rgbimage(:, :, 1) > rgbimage(:, :, 2) & rgbimge(:, :, 2) > rgbimage(:, :, 3);

[senthil vadivu]

Thanks for ur reply