ImageMagick

AcquireColorCache

AcquireColorCache() caches one or more color configurations which provides a mapping between color attributes and a color name.

The format of the AcquireColorCache method is:

LinkedListInfo *AcquireColorCache(const char *filename,
  ExceptionInfo *exception)

A description of each parameter follows:

filename: the font file name.
exception: return any errors or warnings in this structure.

GetColorInfoList

GetColorInfoList() returns any colors that match the specified pattern.

The format of the GetColorInfoList function is:

const ColorInfo **GetColorInfoList(const char *pattern,
  size_t *number_colors,ExceptionInfo *exception)

A description of each parameter follows:

pattern: Specifies a pointer to a text string containing a pattern.
number_colors: This integer returns the number of colors in the list.
exception: return any errors or warnings in this structure.

GetColorList

GetColorList() returns any colors that match the specified pattern.

The format of the GetColorList function is:

char **GetColorList(const char *pattern,size_t *number_colors,
  ExceptionInfo *exception)

A description of each parameter follows:

pattern: Specifies a pointer to a text string containing a pattern.
number_colors: This integer returns the number of colors in the list.
exception: return any errors or warnings in this structure.

ListColorInfo() lists color names to the specified file. Color names are a convenience. Rather than defining a color by its red, green, and blue intensities just use a color name such as white, blue, or yellow.

The format of the ListColorInfo method is:

MagickBooleanType ListColorInfo(FILE *file,ExceptionInfo *exception)

A description of each parameter follows.

file

List color names to this file handle.

exception

return any errors or warnings in this structure.

QueryColorname

QueryColorname() returns a named color for the given color intensity. If an exact match is not found, a hex value is returned instead. For example an intensity of rgb:(0,0,0) returns black whereas rgb:(223,223,223) returns #dfdfdf.

UPDATE: the 'image' argument is no longer needed as all information should have been preset using GetPixelInfo().

The format of the QueryColorname method is:

MagickBooleanType QueryColorname(const Image *image,
  const PixelInfo *color,const ComplianceType compliance,char *name,
  ExceptionInfo *exception)

A description of each parameter follows.

image

the image. (not used! - color gets settings from GetPixelInfo()

color

the color intensities.

Compliance

Adhere to this color standard: SVG, X11, or XPM.

name

Return the color name or hex value.

exception

return any errors or warnings in this structure.