mlib_VideoColorJFIFYCCK2CMYK444(3MLIB)

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 TYPE ATTRIBUTE VALUE Interface Stability Committed MT-Level MT-Safe

See also

mlib_VideoColorCMYK2JFIFYCCK444(3MLIB), attributes(5)