colors - Count the Colors in an Image
status=IsPseudoClass(image)
NumberColors(image,file)
Procedure DestroyList traverses the color cube tree and free the list of
unique colors.
The format of the DestroyList routine is:
Procedure Histogram traverses the color cube tree and produces a list of
unique pixel field values and the number of times each occurs in the image.
The format of the Histogram routine is:
Function InitializeNode allocates memory for a new node in the color cube
tree and presets all fields to zero.
The format of the InitializeNode routine is:
Function IsPseudoClass returns True if the image is PseudoClass and has 256
unique colors or less. If the image is DirectClass and has less 256 colors
or less, the image is demoted to PseudoClass.
The format of the IsPseudoClass routine is:
status=IsPseudoClass(image)
A description of each parameter follows.
- status:
-
Function IsPseudoClass returns True is the image is PseudoClass or has 256
color or less.
- image:
-
The address of a byte (8 bits) array of run-length encoded pixel data of
your source image. The sum of the run-length counts in the source image
must be equal to or exceed the number of pixels.
Function NumberColors returns the number of unique colors in an image.
The format of the NumberColors routine is:
NumberColors(image,file)
A description of each parameter follows.
- image:
-
The address of a byte (8 bits) array of run-length encoded pixel data of
your source image. The sum of the run-length counts in the source image
must be equal to or exceed the number of pixels.
- file:
-
An pointer to a FILE. If it is non-null a list of unique pixel field values
and the number of times each occurs in the image is written to the file.