How can I define two tones in a grayscale image

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I have an ultrasound image with lots of gray tones. I want to threshold the image by defining two of its tones. The higher intensity (white tone) and the lowest intensity (darkest gray tone). All other tones in the middle should be eliminated.
How can I do this?

Accepted Answer

Jan on 17 May 2019
Edited: Jan on 19 May 2019
You cannot eliminate colors in a gray-scale image, but only set them to another value.
img(img > 67 & img < 128) = 0;
Here all gray scale values between 68 and 127 are set to 0.
Jan on 19 May 2019
@Stelios: Correct. This was a typo.

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