remove the white object using filter2

how to remove the white object of grayscale image using filter2

Answer 1

[Image Analyst]

Define "remove." Do you want to extract the bounding box into its own image? If so, see my BlobsDemo http://www.mathworks.com/matlabcentral/fileexchange/?term=authorid%3A31862 Or do you want to set all pixels values of 255 to 0 or nan?

[Diah Mcfdz]

i have image with RGB (1 1 1), RGB (0 0 0), RGB(0.478 0.478 0.478).how to eliminate RGB (1 1 1) from the image, so i only have image with RGB( 0 0 0) RGB(0.478 0.478 0.478)

[Image Analyst]

Which color should the 1,1,1 pixels get set to? 0,0,0, or .478,.478,.478?

rgbImage(rgbImage==1) = 0; % Or 0.478 whichever you want.