mlib_ImageColorOrderedDither8x8(3MLIB)

Name

mlib_ImageColorOrderedDither8x8 - true color to indexed color conversion using ordered dithering

Synopsis

cc [ flag... ] file... –lmlib [ library... ]
#include <mlib.h>

mlib_status (mlib_image *dst, const mlib_image *src, const mlib_s32 *dmask,
     mlib_s32 scale, const void *colormap);

Description

The mlib_ImageColorOrderedDither8x8() function converts a true color image to a pseudo color image with the method of ordered dithering. The source image can be an MLIB_BYTE or MLIB_SHORT image with three or four channels. The destination must be a single-channel MLIB_BYTE or MLIB_SHORT image.

This function works only with a colorcube, rather than a general lookup table. The last parameter, colormap, is an internal data structure (which may include a colorcube) for inverse color mapping. Create it by calling the mlib_ImageColorTrue2IndexInit() function.

Parameters

The function takes the following arguments:

dst

Pointer to destination or destination image.

src

Pointer to source or source image.

dmask

Pointer to the 8x8 dither mask, in row major order. The dither mask is transposed differently for different channels to reduce artifacts.

scale

Scaling factor for dmask to convert the input integer coefficients into floating-point coefficients:

floating-point coefficient = integer coefficient * \
2**(-scale)

colormap

Internal data structure for inverse color mapping.

Return Values

The function returns MLIB_SUCCESS if successful. Otherwise it returns MLIB_FAILURE.

Attributes

See attributes(5) for descriptions of the following attributes:

ATTRIBUTE TYPE ATTRIBUTE VALUE Interface Stability Committed MT-Level MT-Safe

See also

mlib_ImageColorErrorDiffusion3x3(3MLIB), mlib_ImageColorTrue2Index(3MLIB), mlib_ImageColorTrue2IndexFree(3MLIB), mlib_ImageColorTrue2IndexInit(3MLIB), attributes (5)