im2gray

Converts color images or colormaps to grayscale

Calling Sequence

GrayImg = im2gray(RGBImg)

GrayImg = im2gray(index, map)

GrayMap = im2gray(RGBColormap)

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.
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.

initial_dir = PWD;
chdir (SIPDIR + 'images');

Img = imread('tru.jpg');
Img = im2gray(Img);
clf
imshow(Img);

chdir(initial_dir);

Authors

Ricardo Fabbri <ricardofabbri[at]users.sf.net>

Availability

The latest version of SIP can be found at