im2gray - Converts color images or colormaps to grayscale

Calling Sequence

GrayImg = im2gray(RGBImg)

GrayImg = im2gray(index, map)

GrayMap = im2gray(RGBColormap)

Input Parameters

• RGBImg: M x N x 3 truecolor image in any range.
• RGBColormap: M x 3 colormap in RGB colorspace.
• index: and map M x N indexed image and its M x 3 colormap.

Output Parameters

• GrayImg: M x N intensity image.
• GrayMap: M x 3 colormap.

Description

Function im2gray converts RGB images, indexed images and RGB colormaps to grayscale. This is accomplished by converting these objects to YIQ colorspace, make the I and Q channels equal to zero, and finally converting back to RGB colorspace.

Examples

       initial_dir = PWD;
       chdir (SIPDIR + 'images');
       Img = imread('tru.jpg');
       Img = im2gray(Img);
       xbasc()
       imshow(Img);
       chdir(initial_dir);
   

Authors

Ricardo Fabbri <ricardofabbri (AT) users DOT sf DOT net>

Availability

http://siptoolbox.sourceforge.net

See Also

im2bw,  rgb2ntsc,