rgb2gray

RGB to Grayscale colorspace converter. More...

Functions
AFAPI array	rgb2gray (const array &in, const float rPercent=0.2126f, const float gPercent=0.7152f, const float bPercent=0.0722f)
	C++ Interface for RGB to gray conversion. More...
AFAPI af_err	af_rgb2gray (af_array *out, const af_array in, const float rPercent, const float gPercent, const float bPercent)
	C Interface for converting RGB to gray. More...

Detailed Description

RGB to Grayscale colorspace converter.

RGB (Red, Green, Blue) is the most common format used in computer imaging. RGB stores individual values for red, green and blue, and hence the 3 values per pixel. A combination of these three values produces the gamut of unique colors.

Grayscale is a single channel color space where pixel value ranges from 0 to 1. Zero represents black, one represent white and any value between zero & one is a gray value

The grayscale internsity of a pixel is calculated using the following formula:

\(gray = R*rPercent + G*gPercent + B*bPercent\)

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Function Documentation

AFAPI af_err af_rgb2gray	(	af_array *	out,
		const af_array	in,
		const float	rPercent,
		const float	gPercent,
		const float	bPercent
	)

C Interface for converting RGB to gray.

Parameters

[out]	out	is an array in target color space
[in]	in	is an array in the RGB color space
[in]	rPercent	is percentage of red channel value contributing to grayscale intensity
[in]	gPercent	is percentage of green channel value contributing to grayscale intensity
[in]	bPercent	is percentage of blue channel value contributing to grayscale intensity

Returns

AF_SUCCESS if the color transformation is successful, otherwise an appropriate error code is returned.

Note

in must be three dimensional for RGB to Grayscale conversion.

AFAPI array af::rgb2gray	(	const array &	in,
		const float	rPercent = 0.2126f,
		const float	gPercent = 0.7152f,
		const float	bPercent = 0.0722f
	)

C++ Interface for RGB to gray conversion.

Parameters

[in]	in	is an array in the RGB colorspace
[in]	rPercent	is percentage of red channel value contributing to grayscale intensity
[in]	gPercent	is percentage of green channel value contributing to grayscale intensity
[in]	bPercent	is percentage of blue channel value contributing to grayscale intensity

Returns

array in Grayscale colorspace

Note

in must be three dimensional for RGB to Grayscale conversion.