prgb2gray

Synopsis

Description

prgb2gray converts a color image of color space RGB to a gray scale image.

The algorithm is as follows:

   pixel(im_out) = red*pixel.X(im_in)+green*pixel.Y(im_in)+blue*pixel.Z(im_in)/(red+green+blue);

For example, the NTSC standard method uses the following values for red, green and blue:

   red=0.299; green=0.587; blue=0.114;

Parameters

• red specifies the ratio of the Red component.
• green specifies the ratio of the Green component.
• blue specifies the ratio of the Blue component.

Inputs

• im_in: a RGB color image.

Outputs

• im_out: a color space image.

Result

Returns SUCCESS or FAILURE.

Examples

Converts parrot.pan to gray level image using the NTSC standard conversion:

   prgb2gray 0.299 0.587 0.114 parrot.pan a.pan

See also

C++ prototype

Version française

Changement d'espace couleur de RGB vers niveaux de gris.