mlib_ImageColorOrderedDithmediaLibLLibramlib_ImageColorOrderedDither8x8(3MLIB)NAMEmlib_ImageColorOrderedDither8x8 - true color to indexed color conver‐
sion 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 chan‐
nels to reduce artifacts.
scale Scaling factor for dmask to convert the input integer coef‐
ficients 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 ALSOmlib_ImageColorErrorDiffusion3x3(3MLIB), mlib_ImageCol‐
orTrue2Index(3MLIB), mlib_ImageColorTrue2IndexFree(3MLIB), mlib_Image‐
ColorTrue2IndexInit(3MLIB), attributes(5)SunOS 5.10 2 Mar mlib_ImageColorOrderedDither8x8(3MLIB)
