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ImageTools

  

RGBtoGray

  

convert an RGB color image to a grayscale image

  

ToGrayscale

  

convert an RGB color image to a grayscale image

 

Calling Sequence

Parameters

Options

Description

Examples

Calling Sequence

RGBtoGray( img, opts )

ToGrayscale( img, opts )

Parameters

img

-

Image; input image

opts

-

(optional) equation(s) of the form option = value; specify options for the RGBtoGray (ToGrayscale) command

Options

• 

output = GrayImage

  

Specifies a data structure into which the output is written. This can be used to avoid allocating memory. The height, width and order must match that of the input. The dimensions of the output image are adjusted so that the row and column indices match the input. The default is NULL.

Description

• 

The RGBtoGray command converts an image to a grayscale image.

• 

ToGrayscale is a synonym for RGBtoGray.

• 

The img parameter is the image to convert.

• 

If img is of type GrayImage, it is returned.

• 

If img is of type ColorImage or ColorAImage, the three color layers are linearly combined using the equation gray=0.30red+0.59green+0.11blue.

Examples

withImageTools:

img_rgbCreate100,200,r,c→0.252+sin0.0005+0.0008cc+sin0.05r,r,c→0.2+0.1sin0.0025r2+c2,r,c→r100:

img_grayRGBtoGrayimg_rgb:

Embedimg_rgb,img_gray

See Also

ImageTools

ImageTools[ToRGB]

ImageTools[ToRGBA]

 


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