rgb3_to_grey ( ImageRed, ImageGreen, ImageBlue : ImageGrey : : )

Transform an RGB image to a gray scale image.

rgb3_to_grey 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:

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


Parameters

ImageRed (input_object)
image(-array) -> object : byte
Input image (red channel).

ImageGreen (input_object)
image(-array) -> object : byte
Input image (green channel).

ImageBlue (input_object)
image(-array) -> object : byte
Input image (blue channel).

ImageGrey (output_object)
image(-array) -> object : byte
Gray scale image.


Example
/* Tranformation from rgb to grey  */
read_picture(:Image:'tiff',0,0,'patras':Channels) >
disp_color(Image:::) >
decompose3(Image:Rimage,Gimage,Bimage::) >
rgb3_to_grey(Rimage,Gimage,Bimage:GreyImage::) >
disp_image(GreyImage:::).

Possible Predecessors

decompose3


Alternatives

rgb1_to_grey, trans_from_rgb



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