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35 lines
961 B
C++
Executable File
35 lines
961 B
C++
Executable File
/**
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* Jingga
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*
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* @package Image
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* @copyright Dennis Eichhorn
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* @license OMS License 1.0
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* @version 1.0.0
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* @link https://jingga.app
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*/
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#ifndef IMAGE_IMAGE_UTILS_H
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#define IMAGE_IMAGE_UTILS_H
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#include <math.h>
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#include <stdio.h>
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namespace Image::ImageUtils
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{
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inline float lightnessFromRgb(int r, int g, int b)
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{
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float vR = (float) r / 255.0f;
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float vG = (float) g / 255.0f;
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float vB = (float) b / 255.0f;
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float lR = vR <= 0.04045 ? vR / 12.92 : powf(((vR + 0.055f) / 1.055f), 2.4f);
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float lG = vG <= 0.04045 ? vG / 12.92 : powf(((vG + 0.055f) / 1.055f), 2.4f);
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float lB = vB <= 0.04045 ? vB / 12.92 : powf(((vB + 0.055f) / 1.055f), 2.4f);
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float y = 0.2126 * lR + 0.7152 * lG + 0.0722 * lB;
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float lStar = y <= 216.0 / 24389.0 ? y * 24389.0 / 27.0 : powf(y, (1.0 / 3.0)) * 116.0 - 16.0;
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return lStar / 100.0f;
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}
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} // namespace Image::ImageUtils
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#endif |