diqttype.h File Reference

type definitions and constants for the color quantization classes More...

Macros
#define	DcmQuantHashSize   20023UL
	size of color hash table. Don't touch this.
#define	DcmQuantMaxColors   65536
	maximum number of colors we count in a color histogram. More...

Typedefs
typedef unsigned char	DcmQuantComponent
	the basic type for pixel color components

Enumerations
enum	DcmLargestDimensionType { DcmLargestDimensionType_default , DcmLargestDimensionType_luminance }
	defines the algorithm used for determining the largest dimension in the Median Cut algorithm More...
enum	DcmRepresentativeColorType { DcmRepresentativeColorType_default , DcmRepresentativeColorType_averagePixels , DcmRepresentativeColorType_centerOfBox }
	defines the algorithm for choosing a representative color for each box in the Median Cut algorithm More...

Detailed Description

type definitions and constants for the color quantization classes

Macro Definition Documentation

DcmQuantMaxColors

#define DcmQuantMaxColors   65536

maximum number of colors we count in a color histogram.

If the number of colors turns out to be larger than this, then the image bit depth is reduced until the number of colors becomes smaller than this maximum.

Enumeration Type Documentation

DcmLargestDimensionType

enum DcmLargestDimensionType

defines the algorithm used for determining the largest dimension in the Median Cut algorithm

Enumerator
DcmLargestDimensionType_default	determine dimension by comparing the range in RGB space (default)
DcmLargestDimensionType_luminance	determine dimension by transforming into luminance before comparison

DcmRepresentativeColorType

enum DcmRepresentativeColorType

defines the algorithm for choosing a representative color for each box in the Median Cut algorithm

Enumerator
DcmRepresentativeColorType_default	average all the colors in the box (as specified in Heckbert's paper; this is the default)
DcmRepresentativeColorType_averagePixels	average all pixels in the box
DcmRepresentativeColorType_centerOfBox	choose center of the box, ignoring any structure within the boxes