Differential D517 Diff 1686 source/blender/blenlib/intern/math_color_inline.c

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	return 0.35f * rgb[0] + 0.45f * rgb[1] + 0.2f * rgb[2];	return 0.35f * rgb[0] + 0.45f * rgb[1] + 0.2f * rgb[2];
	}	}

	/* non-linear luma from ITU-R BT.601-2	/* non-linear luma from ITU-R BT.601-7
	* see: http://www.poynton.com/notes/colour_and_gamma/ColorFAQ.html#RTFToC11	* see: http://www.poynton.com/notes/colour_and_gamma/ColorFAQ.html#RTFToC11
	* note: the values used for are not exact matches to those documented above,	*
	* but they are from the same */	* luma defined by 'YCC_JFIF', see #rgb_to_ycc
	MINLINE float rgb_to_grayscale(const float rgb[3])	*/
	{
	return 0.3f * rgb[0] + 0.58f * rgb[1] + 0.12f * rgb[2];
	}

	MINLINE unsigned char rgb_to_grayscale_byte(const unsigned char rgb[3])
	{
	return (unsigned char)(((76 * (unsigned short)rgb[0]) +
	(148 * (unsigned short)rgb[1]) +
	(31 * (unsigned short)rgb[2])) / 255);
	}

	/* luma from defined by 'YCC_JFIF', see #rgb_to_ycc */
	MINLINE float rgb_to_luma(const float rgb[3])	MINLINE float rgb_to_luma(const float rgb[3])
	{	{
	return 0.299f * rgb[0] + 0.587f * rgb[1] + 0.114f * rgb[2];	return 0.299f * rgb[0] + 0.587f * rgb[1] + 0.114f * rgb[2];
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