+ hsl and hsv colour spaces (boost/gil/extensions)

This commit is contained in:
Artem Pavlenko 2012-06-17 15:16:48 -04:00
parent 6281dec04b
commit b9765ec1db
2 changed files with 494 additions and 0 deletions

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// Copyright 2007 Christian Henning.
// Distributed under the Boost Software License, Version 1.0. (See
// accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
/*************************************************************************************************/
#ifndef GIL_HSL_H
#define GIL_HSL_H
////////////////////////////////////////////////////////////////////////////////////////
/// \file
/// \brief Support for HSL color space
/// \author Christian Henning \n
////////////////////////////////////////////////////////////////////////////////////////
#include <boost/gil/gil_all.hpp>
namespace boost { namespace gil {
/// \addtogroup ColorNameModel
/// \{
namespace hsl_color_space
{
/// \brief Hue
struct hue_t {};
/// \brief Saturation
struct saturation_t {};
/// \brief Lightness
struct lightness_t {};
}
/// \}
/// \ingroup ColorSpaceModel
typedef mpl::vector3< hsl_color_space::hue_t
, hsl_color_space::saturation_t
, hsl_color_space::lightness_t
> hsl_t;
/// \ingroup LayoutModel
typedef layout<hsl_t> hsl_layout_t;
GIL_DEFINE_ALL_TYPEDEFS( 32f, hsl );
/// \ingroup ColorConvert
/// \brief RGB to HSL
template <>
struct default_color_converter_impl< rgb_t, hsl_t >
{
template <typename P1, typename P2>
void operator()( const P1& src, P2& dst ) const
{
using namespace hsl_color_space;
// only bits32f for hsl is supported
bits32f temp_red = channel_convert<bits32f>( get_color( src, red_t() ));
bits32f temp_green = channel_convert<bits32f>( get_color( src, green_t() ));
bits32f temp_blue = channel_convert<bits32f>( get_color( src, blue_t() ));
bits32f hue, saturation, lightness;
bits32f min_color = std::min( temp_red, std::min( temp_green, temp_blue ));
bits32f max_color = std::max( temp_red, std::max( temp_green, temp_blue ));
if ( max_color - min_color < 0.001 )
{
// rgb color is gray
hue = 0.f;
saturation = 0.f;
// doesn't matter which rgb channel we use.
lightness = temp_red;
}
else
{
bits32f diff = max_color - min_color;
// lightness calculation
lightness = ( min_color + max_color ) / 2.f;
// saturation calculation
if( lightness < 0.5f )
{
saturation = diff
/ ( min_color + max_color );
}
else
{
saturation = ( max_color - min_color )
/ ( 2.f - diff );
}
// hue calculation
if( std::abs( max_color - temp_red ) < 0.0001f )
{
// max_color is red
hue = ( temp_green - temp_blue )
/ diff;
}
else if( std::abs( max_color - temp_green) < 0.0001f )
{
// max_color is green
// 2.0 + (b - r) / (maxColor - minColor)
hue = 2.f
+ ( temp_blue - temp_red )
/ diff;
}
else
{
// max_color is blue
// 4.0 + (r - g) / (maxColor - minColor)
hue = 4.f
+ ( temp_red - temp_green )
/ diff;
}
hue /= 6.f;
if( hue < 0.f )
{
hue += 1.f;
}
}
get_color( dst,hue_t() ) = hue;
get_color( dst,saturation_t() ) = saturation;
get_color( dst,lightness_t() ) = lightness;
}
};
/// \ingroup ColorConvert
/// \brief HSL to RGB
template <>
struct default_color_converter_impl<hsl_t,rgb_t>
{
template <typename P1, typename P2>
void operator()( const P1& src, P2& dst) const
{
using namespace hsl_color_space;
bits32f red, green, blue;
if( std::abs( get_color( src, saturation_t() )) < 0.0001 )
{
// If saturation is 0, the color is a shade of gray
red = get_color( src, lightness_t() );
green = get_color( src, lightness_t() );
blue = get_color( src, lightness_t() );
}
else
{
float temp1, temp2;
float tempr, tempg, tempb;
//Set the temporary values
if( get_color( src, lightness_t() ) < 0.5 )
{
temp2 = get_color( src, lightness_t() )
* ( 1.f + get_color( src, saturation_t() ) );
}
else
{
temp2 = ( get_color( src, lightness_t() ) + get_color( src, saturation_t() ))
- ( get_color( src, lightness_t() ) * get_color( src, saturation_t() ));
}
temp1 = 2.f
* get_color( src, lightness_t() )
- temp2;
tempr = get_color( src, hue_t() ) + 1.f / 3.f;
if( tempr > 1.f )
{
tempr--;
}
tempg = get_color( src, hue_t() );
tempb = get_color( src, hue_t() ) - 1.f / 3.f;
if( tempb < 0.f )
{
tempb++;
}
//Red
if( tempr < 1.f / 6.f )
{
red = temp1 + ( temp2 - temp1 ) * 6.f * tempr;
}
else if( tempr < 0.5f )
{
red = temp2;
}
else if( tempr < 2.f / 3.f )
{
red = temp1 + (temp2 - temp1)
* (( 2.f / 3.f ) - tempr) * 6.f;
}
else
{
red = temp1;
}
//Green
if( tempg < 1.f / 6.f )
{
green = temp1 + ( temp2 - temp1 ) * 6.f * tempg;
}
else if( tempg < 0.5f )
{
green = temp2;
}
else if( tempg < 2.f / 3.f )
{
green = temp1 + ( temp2 - temp1 )
* (( 2.f / 3.f ) - tempg) * 6.f;
}
else
{
green = temp1;
}
//Blue
if( tempb < 1.f / 6.f )
{
blue = temp1 + (temp2 - temp1) * 6.f * tempb;
}
else if( tempb < 0.5f )
{
blue = temp2;
}
else if( tempb < 2.f / 3.f )
{
blue = temp1 + (temp2 - temp1)
* (( 2.f / 3.f ) - tempb) * 6.f;
}
else
{
blue = temp1;
}
}
get_color(dst,red_t()) =
channel_convert<typename color_element_type< P2, red_t >::type>( red );
get_color(dst,green_t())=
channel_convert<typename color_element_type< P2, green_t >::type>( green );
get_color(dst,blue_t()) =
channel_convert<typename color_element_type< P2, blue_t >::type>( blue );
}
};
} } // namespace boost::gil
#endif // GIL_HSL_H

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// Copyright 2004 Christian Henning.
// Distributed under the Boost Software License, Version 1.0. (See
// accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
/*************************************************************************************************/
#ifndef GIL_HSV_H
#define GIL_HSV_H
////////////////////////////////////////////////////////////////////////////////////////
/// \file
/// \brief Support for HSV color space
/// \author Christian Henning \n
////////////////////////////////////////////////////////////////////////////////////////
#include <boost/cast.hpp>
#include <boost/gil/gil_all.hpp>
namespace boost { namespace gil {
/// \addtogroup ColorNameModel
/// \{
namespace hsv_color_space
{
/// \brief Hue
struct hue_t {};
/// \brief Saturation
struct saturation_t{};
/// \brief Value
struct value_t {};
}
/// \}
/// \ingroup ColorSpaceModel
typedef mpl::vector3< hsv_color_space::hue_t
, hsv_color_space::saturation_t
, hsv_color_space::value_t
> hsv_t;
/// \ingroup LayoutModel
typedef layout<hsv_t> hsv_layout_t;
GIL_DEFINE_ALL_TYPEDEFS( 32f, hsv )
/// \ingroup ColorConvert
/// \brief RGB to HSV
template <>
struct default_color_converter_impl< rgb_t, hsv_t >
{
template <typename P1, typename P2>
void operator()( const P1& src, P2& dst ) const
{
using namespace hsv_color_space;
// only bits32f for hsv is supported
bits32f temp_red = channel_convert<bits32f>( get_color( src, red_t() ));
bits32f temp_green = channel_convert<bits32f>( get_color( src, green_t() ));
bits32f temp_blue = channel_convert<bits32f>( get_color( src, blue_t() ));
bits32f hue, saturation, value;
bits32f min_color = (std::min)( temp_red, (std::min)( temp_green, temp_blue ));
bits32f max_color = (std::max)( temp_red, (std::max)( temp_green, temp_blue ));
value = max_color;
bits32f diff = max_color - min_color;
if( max_color < 0.0001f )
{
saturation = 0.f;
}
else
{
saturation = diff / max_color;
}
if( saturation < 0.0001f )
{
//it doesn't matter what value it has
hue = 0.f;
}
else
{
if( (std::abs)( boost::numeric_cast<int>(temp_red - max_color) ) < 0.0001f )
{
hue = ( temp_green - temp_blue )
/ diff;
}
else if( temp_green == max_color )
{
hue = 2.f + ( temp_blue - temp_red )
/ diff;
}
else
{
hue = 4.f + ( temp_red - temp_green )
/ diff;
}
//to bring it to a number between 0 and 1
hue /= 6.f;
if( hue < 0.f )
{
hue++;
}
}
get_color( dst, hue_t() ) = hue;
get_color( dst, saturation_t() ) = saturation;
get_color( dst, value_t() ) = value;
}
};
/// \ingroup ColorConvert
/// \brief HSV to RGB
template <>
struct default_color_converter_impl<hsv_t,rgb_t>
{
template <typename P1, typename P2>
void operator()( const P1& src, P2& dst) const
{
using namespace hsv_color_space;
bits32f red, green, blue;
//If saturation is 0, the color is a shade of gray
if( abs( get_color( src, saturation_t() )) < 0.0001f )
{
// If saturation is 0, the color is a shade of gray
red = get_color( src, value_t() );
green = get_color( src, value_t() );
blue = get_color( src, value_t() );
}
else
{
bits32f frac, p, q, t, h;
bits32 i;
//to bring hue to a number between 0 and 6, better for the calculations
h = get_color( src, hue_t() );
h *= 6.f;
i = static_cast<bits32>( floor( h ));
frac = h - i;
p = get_color( src, value_t() )
* ( 1.f - get_color( src, saturation_t() ));
q = get_color( src, value_t() )
* ( 1.f - ( get_color( src, saturation_t() ) * frac ));
t = get_color( src, value_t() )
* ( 1.f - ( get_color( src, saturation_t() ) * ( 1.f - frac )));
switch( i )
{
case 0:
{
red = get_color( src, value_t() );
green = t;
blue = p;
break;
}
case 1:
{
red = q;
green = get_color( src, value_t() );
blue = p;
break;
}
case 2:
{
red = p;
green = get_color( src, value_t() );
blue = t;
break;
}
case 3:
{
red = p;
green = q;
blue = get_color( src, value_t() );
break;
}
case 4:
{
red = t;
green = p;
blue = get_color( src, value_t() );
break;
}
case 5:
{
red = get_color( src, value_t() );
green = p;
blue = q;
break;
}
}
}
get_color(dst,red_t()) =
channel_convert<typename color_element_type< P2, red_t >::type>( red );
get_color(dst,green_t())=
channel_convert<typename color_element_type< P2, green_t >::type>( green );
get_color(dst,blue_t()) =
channel_convert<typename color_element_type< P2, blue_t >::type>( blue );
}
};
} } // namespace boost::gil
#endif // GIL_HSV_H