| Image Processing Toolbox | |
Convert an RGB image or colormap to grayscale
Syntax
Description
rgb2gray converts RGB images to grayscale by eliminating the hue and saturation information while retaining the luminance.
I = rgb2gray(RGB) converts the truecolor image RGB to the grayscale intensity image I.
newmap = rgb2gray(map) returns a grayscale colormap equivalent to map.
Class Support
If the input is an RGB image, it can be of class uint8, uint16, or double. The output image, I, is of the same class as the input image. If the input is a colormap, the input and output colormaps are both of class double.
Algorithm
rgb2gray converts the RGB values to NTSC coordinates, sets the hue and saturation components to zero, and then converts back to RGB color space.
See Also
ind2gray, ntsc2rgb, rgb2ind, rgb2ntsc
| | regionprops | rgb2hsv | |