im_colorhsi.h

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00001 /** \file
00002  * \brief HSI Color Manipulation
00003  *
00004  * See Copyright Notice in im_lib.h
00005  */
00006 
00007 #ifndef __IM_COLORHSI_H
00008 #define __IM_COLORHSI_H
00009 
00010 #if     defined(__cplusplus)
00011 extern "C" {
00012 #endif
00013 
00014 
00015 /** \defgroup hsi HSI Color Coordinate System Conversions
00016  *
00017  * \par
00018  * HSI is just the RGB color space written in a different coordinate system.
00019  * \par
00020  * "I" is defined along the cube diagonal. It ranges from 0 (black) to 1 (white). \n
00021  * HS are the polar coordinates of a plane normal to "I". \n
00022  * "S" is the normal distance from the diagonal of the RGB cube. It ranges from 0 to 1. \n
00023  * "H" is the angle starting from the red vector, given in degrees.
00024  * \par
00025  * This is not a new color space, this is exactly the same gammut as RGB. \n
00026  * \par
00027  * See \ref im_colorhsi.h
00028  * \ingroup color */
00029 
00030 
00031 /** Returns I where S is maximum given H (here in radians).
00032  * \ingroup hsi */
00033 float imColorHSI_ImaxS(float h, double cosh, double sinh);
00034 
00035 /** Converts from RGB to HSI.
00036  * \ingroup hsi */
00037 void imColorRGB2HSI(float r, float g, float b, float *h, float *s, float *i);
00038 
00039 /** Converts from RGB (byte) to HSI.
00040  * \ingroup hsi */
00041 void imColorRGB2HSIbyte(unsigned char r, unsigned char g, unsigned char b, float *h, float *s, float *i);
00042 
00043 /** Converts from HSI to RGB.
00044  * \ingroup hsi */
00045 void imColorHSI2RGB(float h, float s, float i, float *r, float *g, float *b);
00046 
00047 /** Converts from HSI to RGB (byte).
00048  * \ingroup hsi */
00049 void imColorHSI2RGBbyte(float h, float s, float i, unsigned char *r, unsigned char *g, unsigned char *b);
00050 
00051 
00052 #if defined(__cplusplus)
00053 }
00054 #endif
00055 
00056 #endif

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