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35 lines
1.0 KiB
C
35 lines
1.0 KiB
C
#ifndef NICOLOR_H
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#define NICOLOR_H
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struct NiColor {
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float m_Red;
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float m_Green;
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float m_Blue;
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NiColor(float red, float green, float blue) : m_Red(red), m_Green(green), m_Blue(blue) {}
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NiColor() : NiColor(0.0f, 0.0f, 0.0f) {}
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/* reduce RGB files to grayscale, with or without alpha
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* using the equation given in Poynton's ColorFAQ at
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* <http://www.inforamp.net/~poynton/> // dead link
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* Copyright (c) 1998-01-04 Charles Poynton poynton at inforamp.net
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*
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* Y = 0.212671 * R + 0.715160 * G + 0.072169 * B
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*
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* We approximate this with
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*
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* Y = 0.21268 * R + 0.7151 * G + 0.07217 * B
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*
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* which can be expressed with integers as
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*
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* Y = (6969 * R + 23434 * G + 2365 * B)/32768
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*
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* The calculation is to be done in a linear colorspace.
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*
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* Other integer coefficents can be used via png_set_rgb_to_gray().
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*/
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float ToXYZ() const { return (m_Red * 0.212671f) + (m_Green * 0.71516f) + (m_Blue * 0.072169f); };
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};
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#endif // NICOLOR_H
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