matlab - Converting a RGB image to grayscale based on the intensity of one color channel -


this question has answer here:

i'm working images similar this: a cell image, , want extract red-pink sections. of i'm using img(:,:,1) pull out red values produces binary image. wanted know if there way extract "red" values , produce grayscale image based on degree of "redness" or intensity. awesome.

you visualizing result using imshow automatically set color limits of axes between 0 , 1. image rgb , values of red channel going range 0 255. because of this, if specify 1 input imshow, image values > 1 appear white , zero-values black. image isn't binary, appears way.

you want either display image imagesc automatically scale color limits match data:

imagesc(img(:,:,1)); colormap gray

or can specify second input imshow cause scale fit data range:

imshow(img(:,:,1), [])

the reason isn't issue when visualizing channels if specify red, green, , blue channels, considered true color image , axes color limits ignored.


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