rgb1_to_gray

Herror ::rgb1_to_gray ( Hobject RGBImage, Hobject *GrayImage ) HImage HImage::Rgb1ToGray ( void ) const HImageArray HImageArray::Rgb1ToGray ( void ) const

Transform an RGB image into a gray scale image.

::rgb1_to_gray transforms an RGB image into a gray scale image. The three channels of the RGB image are passed as the first three channels of the input image. The image is transformed according to the following formula:

   gray = 0.299 * red + 0.587 * green + 0.144 * blue .

Parameters

`RGBImage` (input_object)	image(-array) `->` Hobject: HImage(Array) ( byte / int2 )
Three-channel RBG image.

`GrayImage` (output_object)	image(-array) `->` Hobject : HImage(Array)* ( byte / int2 )
Gray scale image.

Example

/* Tranformation from rgb to gray  */
read_image(Image,"patras") ;
disp_color(Image,WindowHandle) ;
rgb1_to_gray(Image,&GrayImage) ;
disp_image(GrayImage,WindowHandle);

Possible Predecessors

::compose3

Alternatives

::trans_from_rgb, ::rgb3_to_gray

Module

Image filters