1mlib_ImageColorErrorDiffusimoendMixaNL(i3bMLLIiBb)ramrlyibF_uInmcatgieoCnoslorErrorDiffusionMxN(3MLIB)
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NAME

6       mlib_ImageColorErrorDiffusionMxN   -  true-color  to  indexed-color  or
7       grayscale to black-white conversion, using error diffusion
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SYNOPSIS

10       cc [ flag... ] file... -lmlib [ library... ]
11       #include <mlib.h>
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13       mlib_status mlib_ImageColorErrorDiffusionMxN(mlib_image *dst,
14            const mlib_image *src, const mlib_s32 *kernel,
15            mlib_s32 m, mlib_s32 n, mlib_s32 dm, mlib_s32 dn,
16            mlib_s32 scale, const void *colormap);
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DESCRIPTION

20       The mlib_ImageColorErrorDiffusionMxN() function  converts  a  3-channel
21       image  to  a 1-channel indexed image, or converts a 1-channel grayscale
22       image to a 1-channel MLIB_BIT image, with the method  of  error  diffu‐
23       sion.
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26       The src can be an MLIB_BYTE image with 1 or 3 channels. The dst must be
27       a 1-channel MLIB_BIT or MLIB_BYTE image.
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30       The colormap must be created by mlib_ImageColorDitherInit(). It may  or
31       may  not  have a colorcube included. If it does, the colorcube is used.
32       Otherwise, the general lookup table included in colormap is used.
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35       The kernel is required to have the following property:
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37         kernel[0] = kernel[1] = ... = kernel[m*dn+dm] = 0;
38         kernel[m*dn+dm+1] + ... + kernel[m*n-1] = 2**scale;
39         scale ≥ 0
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PARAMETERS

43       The function takes the following arguments:
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45       dst         Pointer to destination image.
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48       src         Pointer to source image.
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51       kernel      Pointer to the  error-distribution  kernel,  in  row  major
52                   order.
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55       m           Kernel width. m > 1.
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58       n           Kernel height. n > 1.
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61       dm          X coordinate of the key element in the kernel. 0 ≤ dm < m.
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64       dn          Y coordinate of the key element in the kernel. 0 ≤ dn < n.
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67       scale       The  scaling factor for kernel to convert the input integer
68                   coefficients into floating-point coefficients:
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70                     floating-point coefficient = integer coefficient * \
71                     2**(-scale)
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75       colormap    Internal data structure for image dithering.
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RETURN VALUES

79       The function returns MLIB_SUCCESS if successful. Otherwise  it  returns
80       MLIB_FAILURE.
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ATTRIBUTES

83       See attributes(5) for descriptions of the following attributes:
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88       ┌─────────────────────────────┬─────────────────────────────┐
89       │      ATTRIBUTE TYPE         │      ATTRIBUTE VALUE        │
90       ├─────────────────────────────┼─────────────────────────────┤
91       │Interface Stability          │Committed                    │
92       ├─────────────────────────────┼─────────────────────────────┤
93       │MT-Level                     │MT-Safe                      │
94       └─────────────────────────────┴─────────────────────────────┘
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SEE ALSO

97       mlib_ImageColorDitherInit(3MLIB),     mlib_ImageColorDitherFree(3MLIB),
98       mlib_ImageColorErrorDiffusion3x3(3MLIB),        mlib_ImageColorOrdered‐
99       Dither8x8(3MLIB), mlib_ImageColorOrderedDitherMxN(3MLIB), attributes(5)
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103SunOS 5.11                        2 Marm2l0i0b7_ImageColorErrorDiffusionMxN(3MLIB)
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