mlib_ImageColorRGB2Mono(3MLIB) mediaLib Library Functions mlib_ImageColorRGB2Mono(3MLIB)NAME
mlib_ImageColorRGB2Mono - RGB to monochrome conversion
SYNOPSIS
cc [ flag... ] file... -lmlib [ library... ]
#include <mlib.h>
mlib_status mlib_ImageColorRGB2Mono(mlib_image *dst, const mlib_image *src, const mlib_d64 *weight);
DESCRIPTION
The mlib_ImageColorRGB2Mono() function performs a conversion from a red/green/blue to a monochromatic image. The source image must be a
three-channel image. The destination image must be a single-channel image.
It uses the following equation:
dst[x][y][0] = weight[0]*src[x][y][0] +
weight[1]*src[x][y][1] +
weight[2]*src[x][y][2]
PARAMETERS
The function takes the following arguments:
dst Pointer to destination image.
src Pointer to source image.
weight Array of three blending coefficients. It is recommended that these sum to 1.0, but it is not required.
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 |Evolving |
+-----------------------------+-----------------------------+
|MT-Level |MT-Safe |
+-----------------------------+-----------------------------+
SEE ALSO mlib_ImageColorRGB2CIEMono(3MLIB), mlib_ImageColorRGB2CIEMono_Fp(3MLIB), mlib_ImageColorRGB2Mono_Fp(3MLIB), attributes(5)SunOS 5.10 10 Nov 2004 mlib_ImageColorRGB2Mono(3MLIB)
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mlib_ImageDivAlpha(3MLIB) mediaLib Library Functions mlib_ImageDivAlpha(3MLIB)NAME
mlib_ImageDivAlpha - alpha channel division
SYNOPSIS
cc [ flag... ] file... -lmlib [ library... ]
#include <mlib.h>
mlib_status mlib_ImageDivAlpha(mlib_image *dst, const mlib_image *src, mlib_s32 cmask);
DESCRIPTION
The mlib_ImageDivAlpha() function divides color channels by the alpha channel on a pixel-by-pixel basis.
For the MLIB_BYTE image, it uses the following equation:
dst[x][y][c] = src[x][y][c] / (src[x][y][a] * 2**(-8))
For the MLIB_SHORT image, it uses the following equation:
dst[x][y][c] = src[x][y][c] / (src[x][y][a] * 2**(-15))
For the MLIB_USHORT image, it uses the following equation:
dst[x][y][c] = src[x][y][c] / (src[x][y][a] * 2**(-16))
For the MLIB_INT image, it uses the following equation:
dst[x][y][c] = src[x][y][c] / (src[x][y][a] * 2**(-31))
where c and a are the indices for the color channels and the alpha channel, respectively, so c != a.
In the case of src[x][y][a] = 0,
dst[x][y][c] = 0 if src[x][y][c] = 0
dst[x][y][c] = DATA_TYPE_MAX if src[x][y][c] > 0
dst[x][y][c] = DATA_TYPE_MIN if src[x][y][c] < 0
where DATA_TYPE is MLIB_U8, MLIB_S16, MLIB_U16, or MLIB_S32 for an image of type MLIB_BYTE, MLIB_SHORT, MLIB_USHORT, or MLIB_INT, respec-
tively.
PARAMETERS
The function takes the following arguments:
dst Pointer to destination image.
src Pointer to source image.
cmask Channel mask to indicate the alpha channel. Each bit of the mask represents a channel in the image. The channel correspond-
ing to the 1 bit of cmask is the alpha channel.
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 |Evolving |
+-----------------------------+-----------------------------+
|MT-Level |MT-Safe |
+-----------------------------+-----------------------------+
SEE ALSO mlib_ImageDivAlpha_Inp(3MLIB), mlib_ImageDivAlpha_Fp(3MLIB), mlib_ImageDivAlpha_Fp_Inp(3MLIB), attributes(5)SunOS 5.10 10 Nov 2004 mlib_ImageDivAlpha(3MLIB)