Removing grey pixels from an image

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Tarik Razak 2012-2-7

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编辑： Walter Roberson 2013-10-3

Hi I have an image in which there are black pixels and gray ones. I am trying a way to remove the gray pixels and just keep the black ones. I dont want to do im2bw because I believe it will just turn the gray to black. Thanks for the help

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Walter Roberson 2012-2-7

What should the gray pixels be replaced with?

Tarik Razak 2012-2-7

with white or nothing thanks

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Answer 1

Image Analyst 2012-2-7

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You can't replace with nothing because the image must remain rectangular. So try this

imageArray(imageArray ~= 0) = 255;

That will turn all pixels not equal to zero (pure black) to 255 (pure white). If you need 1 instead of 255 (like it's a logical or floating point image) then just use 1 instead of 255.

imageArray(imageArray ~= 0) = 1;