Content-type: text/html Man page of mlib_ImageColorOrderedDitherMxN

mlib_ImageColorOrderedDitherMxN

Section: mediaLib Library Functions (3MLIB)
Updated: 2 Mar 2007
Index Return to Main Contents
 

NAME

mlib_ImageColorOrderedDitherMxN - true-color to indexed-color or grayscale to black-white conversion, using ordered dithering  

SYNOPSIS

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

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

 

DESCRIPTION

The mlib_ImageColorOrderedDitherMxN() function converts a 3-channel image to a 1-channel indexed image, or converts a 1-channel grayscale image to a 1-channel MLIB_BIT image, with the method of ordered dithering.

The src can be an MLIB_BYTE image with 1 or 3 channels. The dst must be a 1-channel MLIB_BIT or MLIB_BYTE image.

The colormap must be created by mlib_ImageColorDitherInit(), and it must have a colorcube included.

The dither masks are required to have the following property:

0 ≤ dmask[i][j] < 2**scale; scale > 0

 

PARAMETERS

The function takes the following arguments:

dst

Pointer to destination image.

src

Pointer to source image.

dmask

Pointer to the dither masks, one per channel, in row major order.

m

Mask width. m > 1.

n

Mask height. n > 1.

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 image dithering.

 

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 TYPEATTRIBUTE VALUE

Interface StabilityCommitted

MT-Level

 

SEE ALSO

mlib_ImageColorDitherInit(3MLIB), mlib_ImageColorDitherFree(3MLIB), mlib_ImageColorErrorDiffusion3x3(3MLIB), mlib_ImageColorErrorDiffusionMxN(3MLIB), mlib_ImageColorOrderedDither8x8(3MLIB), attributes(5)


 

Index

NAME
SYNOPSIS
DESCRIPTION
PARAMETERS
RETURN VALUES
ATTRIBUTES
SEE ALSO

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Time: 02:37:57 GMT, October 02, 2010