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| RGBValue |

Class for a single RGB value. More...

`#include <vigra/rgbvalue.hxx>`

Inheritance diagram for RGBValue:

List of all members.

## Public Types

enum |
typedef Base::const_iterator | const_iterator
typedef Base::iterator | iterator
typedef Base::NormType | NormType
typedef Base::SquaredNormType | SquaredNormType
typedef Base::value_type | value_type

## Public Member Functions

value_type const & | blue () const
value_type & | blue ()
value_type const & | green () const
value_type & | green ()
value_type | luminance () const
NormType | magnitude () const
RGBValue | operator- () const
RGBValue & | operator= (TinyVector< value_type, 3 > const &r)
template<class U, unsigned int R, unsigned int G, unsigned int B>
RGBValue & | operator= (RGBValue< U, R, G, B > const &r)
value_type const & | red () const
value_type & | red ()
| RGBValue (TinyVector< value_type, 3 > const &r)
template<class U, unsigned int R, unsigned int G, unsigned int B>
| RGBValue (RGBValue< U, R, G, B > const &r)
| RGBValue ()
template<class Iterator>
| RGBValue (Iterator i, Iterator end)
| RGBValue (value_type gray)
| RGBValue (value_type first, value_type second, value_type third)
template<class V>
void | setBlue (V value)
template<class V>
void | setGreen (V value)
template<class V>
void | setRed (V value)
SquaredNormType | squaredMagnitude () const

## Detailed Description

### template<class VALUETYPE, unsigned int RED_IDX = 0, unsigned int GREEN_IDX = 1, unsigned int BLUE_IDX = 2>
class vigra::RGBValue< VALUETYPE, RED_IDX, GREEN_IDX, BLUE_IDX >

Class for a single RGB value.

This class contains three values (of the specified type) that represent red, green, and blue color channels. By means of the template parameters `RED_IDX, GREEN_IDX, BLUE_IDX`, the indices 0, 1, 2 can be assigned to the three colors arbitrarily, so that, for example, a BGR type can be created as

        typedef RGBValue<unsigned char, 2,1,0> BGRValue;

The standard order red=0, green=1, blue=2 is the default. There are three possibilities to access the color values: accessor functions (red(), green(), blue()), index operator (operator[](dx), where the `rgb[RED_IDX]` returns red etc.) and iterator (STL-compatible random access iterator that references the three colors in turn). The latter two methods, together with the necessary embedded typedefs, ensure compatibility of a RGBValue with a STL vector.

Arithmetic operations are defined as component-wise applications of these operations. Addition, subtraction, and multiplication of two RGBValues (+=, -=, *=, +, -, *, unary -), multiplication and division of an RGBValue with a double, and NumericTraits/PromoteTraits are defined, so that RGBValue fulfills the requirements of a Linear Algebra.

A number of accessors are provided that support access to RGBValues as a whole, to a selected color component, or to the luminance value.

#include <vigra/rgbvalue.hxx>
Namespace: vigra

Examples:

  invert.cxx, invert_explicitly.cxx, palette.cxx, and watershed.cxx.

## Member Typedef Documentation

typedef Base::const_iterator const_iterator

STL-compatible definition of const iterator

Reimplemented from TinyVector< VALUETYPE, 3 >.

typedef Base::iterator iterator

STL-compatible definition of iterator

Reimplemented from TinyVector< VALUETYPE, 3 >.

typedef Base::NormType NormType

norm type (result of magnitude())

Reimplemented from TinyVector< VALUETYPE, 3 >.

typedef Base::SquaredNormType SquaredNormType

squared norm type (result of squaredManitude())

Reimplemented from TinyVector< VALUETYPE, 3 >.

typedef Base::value_type value_type

STL-compatible definition of valuetype

Reimplemented from TinyVector< VALUETYPE, 3 >.

## Member Enumeration Documentation

anonymous enum

Color index positions

## Constructor & Destructor Documentation

RGBValue | ( | value_type | first,
|  | value_type | second,
|  | value_type | third |
| ) |  |  |

Construct from explicit color values. first, second, third are written in this order, irrespective of how the color indices are specified.

RGBValue | ( | value_type | gray | ) |

Construct gray value

template<class Iterator>
RGBValue | ( | Iterator | i,
|  | Iterator | end |
| ) |  |  |

Construct from another sequence (must have length 3!)

RGBValue | ( |  | ) |

Default constructor (sets all components to 0)

template<class U, unsigned int R, unsigned int G, unsigned int B>
RGBValue | ( | RGBValue< U, R, G, B > const & | r | ) |

Copy constructor.

RGBValue | ( | TinyVector< value_type, 3 > const & | r | ) |

construct from TinyVector

## Member Function Documentation

value_type const& blue | ( |  | ) | const

Get blue component.

value_type& blue | ( |  | ) |

Access blue component.

value_type const& green | ( |  | ) | const

Get green component.

value_type& green | ( |  | ) |

Access green component.

value_type luminance | ( |  | ) | const

Calculate luminance.

NormType magnitude | ( |  | ) | const

Calculate magnitude.

Reimplemented from TinyVectorBase.

RGBValue operator- | ( |  | ) | const

Unary negation (construct RGBValue with negative values)

RGBValue& operator= | ( | TinyVector< value_type, 3 > const & | r | ) |

assign TinyVector.

RGBValue& operator= | ( | RGBValue< U, R, G, B > const & | r | ) |

Copy assignment.

value_type const& red | ( |  | ) | const

Get red component.

value_type& red | ( |  | ) |

Access red component.

template<class V>
void setBlue | ( | V | value | ) |

Set blue component.The type `V` of the passed in `value` is automatically converted to `VALUETYPE`.

template<class V>
void setGreen | ( | V | value | ) |

Set green component.The type `V` of the passed in `value` is automatically converted to `VALUETYPE`.

template<class V>
void setRed | ( | V | value | ) |

Set red component. The type `V` of the passed in `value` is automatically converted to `VALUETYPE`.

SquaredNormType squaredMagnitude | ( |  | ) | const

Calculate squared magnitude.

Reimplemented from TinyVectorBase.

The documentation for this class was generated from the following file:

- vigra/rgbvalue.hxx

© Ullrich Köthe (ullrich.koethe@iwr.uni-heidelberg.de) Heidelberg Collaboratory for Image Processing, University of Heidelberg, Germany | html generated using doxygen and Python VIGRA 1.6.0 (13 Aug 2008)