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RGBValue | ![]() |
Class for a single RGB value. More...
#include <vigra/rgbvalue.hxx>

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
invert.cxx, invert_explicitly.cxx, palette.cxx, and watershed.cxx.
| typedef Base::const_iterator const_iterator |
STL-compatible definition of const iterator
Reimplemented from TinyVector< VALUETYPE, 3 >.
| typedef Base::const_pointer const_pointer |
const pointer (return of operator-> const).
Reimplemented from TinyVector< VALUETYPE, 3 >.
| typedef Base::const_reference const_reference |
const reference (return of operator[] const).
Reimplemented from TinyVector< VALUETYPE, 3 >.
| typedef Base::difference_type difference_type |
STL-compatible definition of difference_type
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::pointer pointer |
pointer (return of operator->).
Reimplemented from TinyVector< VALUETYPE, 3 >.
| typedef Base::reference reference |
reference (return of operator[]).
Reimplemented from TinyVector< VALUETYPE, 3 >.
the scalar type for the outer product
Reimplemented from TinyVector< VALUETYPE, 3 >.
| typedef Base::size_type size_type |
STL-compatible definition of size_type
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 >.
| anonymous enum |
Color index positions
| 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.
| RGBValue | ( | const_pointer | i | ) | [explicit] |
Copy from raw memory. The order is preserved, irrespective of how the color indices are specified.
| RGBValue | ( | const_pointer | i, | |
| ReverseCopyTag | reverse | |||
| ) |
Construct by reverse copying from raw memory.
| 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
| 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= | ( | TinyVector< value_type, 3 > const & | r | ) |
assign TinyVector.
| 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.
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© Ullrich Köthe (ullrich.koethe@iwr.uni-heidelberg.de) |
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