contrast

Grayscale colormap for contrast enhancement

Syntax

cmap = contrast(X)
cmap = contrast(X,m)

Description

The contrast function enhances the contrast of an image. It creates a new gray colormap, cmap, that has an approximately equal intensity distribution. All three elements in each row are identical.

cmap = contrast(X) returns a gray colormap that is the same length as the current colormap. If there are NaN or Inf elements in X the length of the colormap increases.

cmap = contrast(X,m) returns an m-by-3 gray colormap.

Examples

expand all

Display Image with Gray Colormap

Load clown to get image X and its associated colormap, map. Display the image produced by X and map.

load clown
figure
image(X)
colormap(map)

Use contrast to return a gray colormap that is the same length as the current colormap, map. Display the image with the new colormap, cmap.

cmap = contrast(X);
colormap(cmap)

See Also

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