mirror of https://github.com/GNOME/gimp.git
41 lines
1.6 KiB
C
41 lines
1.6 KiB
C
/* LIBGIMP - The GIMP Library
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* Copyright (C) 1995-1997 Peter Mattis and Spencer Kimball
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*
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* This library is free software: you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 3 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see
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* <https://www.gnu.org/licenses/>.
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*/
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#ifndef __GIMP_COLOR_PRIVATE_H__
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#define __GIMP_COLOR_PRIVATE_H__
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/* Legacy definition to calculate luminance from sRGB.
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*
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* These values and macro are specific to a "RGB float" to "Y float"
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* conversion within sRGB space. These should not be used in new code,
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* where converting to "Y float", space aware, may often be what you
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* wanted to do.
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* Once we got rid of all remaining usages in plug-ins and app, we can
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* delete this file as it's not distributed.
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*/
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#define GIMP_RGB_LUMINANCE_RED (0.22248840)
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#define GIMP_RGB_LUMINANCE_GREEN (0.71690369)
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#define GIMP_RGB_LUMINANCE_BLUE (0.06060791)
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#define GIMP_RGB_LUMINANCE(r,g,b) ((r) * GIMP_RGB_LUMINANCE_RED + \
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(g) * GIMP_RGB_LUMINANCE_GREEN + \
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(b) * GIMP_RGB_LUMINANCE_BLUE)
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#endif /* __GIMP_COLOR_PRIVATE_H__ */
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