im2bw() - Image Processing

BW = im2bw(I, level) converts
the grayscale image I to a binary image. The output
image BW replaces all pixels in the input image
with luminance greater than level with the value
1 (white) and replaces all other pixels with the value 0 (black).
Specify level in the range [0,1]. This range is
relative to the signal levels possible for the image's class. Therefore,
a level value of 0.5 is midway
between black and white, regardless of class. To compute the level argument,
you can use the function graythresh.
If you do not specify level, im2bw uses
the value 0.5. BW = im2bw(X, map, level) converts
the indexed image X with colormap map to
a binary image.BW = im2bw(RGB, level) converts
the truecolor image RGB to a binary image.If the input image is not a grayscale image, im2bw converts
the input image to grayscale, and then converts this grayscale image
to binary by thresholding.

Syntax

BW = im2bw(I, level)BW = im2bw(X, map, level)BW = im2bw(RGB, level)

Example

Convert an Indexed Image To a Binary ImageOpen This Example
load trees
BW = im2bw(X,map,0.4);
imshow(X,map), figure, imshow(BW)

Output / Return Value

Limitations

Alternatives / See Also

Reference