Removing grey pixels from an image

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Tarik Razak
Tarik Razak 2012-2-7
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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回答（2 个）

Image Analyst
Image Analyst 2012-2-7
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;
Shiva Arun Kumar
Shiva Arun Kumar 2012-2-7
Why would this not work?
bw=im2bw(I,0)
Where I is the image that was read in.

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