Content-type: text/html Man page of mlib_VideoColorJFIFYCCK2CMYK444

mlib_VideoColorJFIFYCCK2CMYK444

Section: mediaLib Library Functions (3MLIB)
Updated: 23 May 2007
Index Return to Main Contents
 

NAME

mlib_VideoColorJFIFYCCK2CMYK444 - JFIF YCbCr to CMYK color conversion  

SYNOPSIS

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

mlib_status mlib_VideoColorJFIFYCCK2CMYK444(mlib_u8 *cmyk,
    const mlib_u8 *y, const mlib_u8 *cb,
    const mlib_u8 *cr, const mlib_u8 *k,
    mlib_s32 n);

 

DESCRIPTION

The mlib_VideoColorJFIFYCCK2CMYK444() function performs color space conversion from YCbCrK to CMYK when used in the JPEG File Interchange Format (JFIF).

The following equation is used:

R = Y                        + 1.40200 * (Cr - 128)
G = Y - 0.34414 * (Cb - 128) - 0.71414 * (Cr - 128)
B = Y + 1.77200 * (Cb - 128)
C = (255 - R)
M = (255 - G)
Y = (255 - B)
K = K

 

PARAMETERS

The function takes the following arguments:

cmyk

Pointer to destination CMYK multi-component row. cmyk must be 8-byte aligned.

y

Pointer to source Y component row. y must be 8-byte aligned.

cb

Pointer to source Cb component row. cb must be 8-byte aligned.

cr

Pointer to source Cr component row. cr must be 8-byte aligned.

k

Pointer to source K component row. k must be 8-byte aligned.

n

Length of Y, Cb, Cr, and K component rows. The length of the CMYK multi-component row must be 4*n.

 

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_VideoColorCMYK2JFIFYCCK444(3MLIB), attributes(5)


 

Index

NAME
SYNOPSIS
DESCRIPTION
PARAMETERS
RETURN VALUES
ATTRIBUTES
SEE ALSO

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Time: 02:38:05 GMT, October 02, 2010