value of the pixel

 sir i have a edged image(img) ,i need to check a specific pixel whether it is white or black. how to check?
 that is in an image of size 1024X768, i need to check(100X343)Th pixel, how to do please help in coding

Answer 1

[Matt Fig]

That would depend somewhat on the datatype, and how exact you want to be in calling something black. Do you want a tolerance? What kind of image is it? I.e., if myimage is the name of your image, what does this return:

whos myimage

Answer 2

[Walter Roberson]

if any(img(100,343,:) ~= 0)
  %it is not pure black. Might be very very dark gray, though.
else
  %it is pure black
end

For a 2D binary image, you can reduce this test to

if img(100,343)
  %it is white
else
  %it is black
end