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/** \file
* \brief HSI Color Manipulation
*
* See Copyright Notice in im_lib.h
*/
#ifndef __IM_COLORHSI_H
#define __IM_COLORHSI_H
#if defined(__cplusplus)
extern "C" {
#endif
/** \defgroup hsi HSI Color Coordinate System Conversions
*
* \par
* HSI is just the RGB color space written in a different coordinate system.
* \par
* "I" is defined along the cube diagonal. It ranges from 0 (black) to 1 (white). \n
* HS are the polar coordinates of a plane normal to "I". \n
* "S" is the normal distance from the diagonal of the RGB cube. It ranges from 0 to Smax. \n
* "H" is the angle starting from the red vector, given in degrees.
* \par
* This is not a new color space, this is exactly the same gammut as RGB. \n
* Since it is still a cube, Smax depends on H.
* \par
* See \ref im_colorhsi.h
* \ingroup color */
/** Returns the maximum S for H (here in radians) and I.
* \ingroup hsi */
float imColorHSI_Smax(float h, double cosh, double sinh, float i);
/** Returns I where S is maximum given H (here in radians).
* \ingroup hsi */
float imColorHSI_ImaxS(float h, double cosh, double sinh);
/** Converts from RGB to HSI.
* \ingroup hsi */
void imColorRGB2HSI(float r, float g, float b, float *h, float *s, float *i);
/** Converts from RGB (byte) to HSI.
* \ingroup hsi */
void imColorRGB2HSIbyte(unsigned char r, unsigned char g, unsigned char b, float *h, float *s, float *i);
/** Converts from HSI to RGB.
* \ingroup hsi */
void imColorHSI2RGB(float h, float s, float i, float *r, float *g, float *b);
/** Converts from HSI to RGB (byte).
* \ingroup hsi */
void imColorHSI2RGBbyte(float h, float s, float i, unsigned char *r, unsigned char *g, unsigned char *b);
#if defined(__cplusplus)
}
#endif
#endif
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