rgb3_to_gray

Herror ::rgb3_to_gray ( Hobject ImageRed, Hobject ImageGreen, Hobject ImageBlue, Hobject *ImageGray ) HImage HImage::Rgb3ToGray ( const HImageArray &ImageGreen, const HImageArray &ImageBlue ) const HImageArray HImageArray::Rgb3ToGray ( const HImageArray &ImageGreen, const HImageArray &ImageBlue ) const

Transform an RGB image to a gray scale image.

::rgb3_to_gray transforms an RGB image into a gray scale image. The three channels of the RGB image are passed as three separate images. The image is transformed according to the following formula:

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

Parameters

`ImageRed` (input_object)	image(-array) `->` Hobject: HImage(Array) ( byte / int2 )
Input image (red channel).

`ImageGreen` (input_object)	image(-array) `->` Hobject: HImage(Array) ( byte / int2 )
Input image (green channel).

`ImageBlue` (input_object)	image(-array) `->` Hobject: HImage(Array) ( byte / int2 )
Input image (blue channel).

`ImageGray` (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) ;
decompose3(Image,&Rimage,&Gimage,&Bimage) ;
rgb3_to_gray(Rimage,Gimage,Bimage,&GrayImage) ;
disp_image(GrayImage,WindowHandle);

Possible Predecessors

::decompose3

Alternatives

::rgb1_to_gray, ::trans_from_rgb

Module

Image filters