contrast (MATLAB Function Reference)

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.

cmap = contrast(X,m)

returns an m-by-3 gray colormap.

Examples

Add contrast to the clown image defined by X.

load clown;
cmap = contrast(X);
image(X); 
colormap(cmap);