Convert YCCK MCU to CMYK
| FwStatus | fwiYCCK444ToCMYKLS_MCU_16s8u_P4C4R | ( | const Fw16s * pSrcMCU[4], Fw8u * pDstCMYK, int dstStep ); | |
| FwStatus | fwiYCCK422ToCMYKLS_MCU_16s8u_P4C4R | ( | const Fw16s * pSrcMCU[4], Fw8u * pDstCMYK, int dstStep ); | |
| FwStatus | fwiYCCK411ToCMYKLS_MCU_16s8u_P4C4R | ( | const Fw16s * pSrcMCU[4], Fw8u * pDstCMYK, int dstStep ); |
| dstStep | Destination buffer step size (width of the buffer in bytes). | |
| pDstCMYK | Pointer to destination image ROI for CMYK image format. | |
| pSrcMCU[4] | Array of pointers to source MCU image blocks. |
These functions step through a minimum coded unit in a source buffer, convert the data from the YCCK color space to the CMYK color model, level-shift the signed values to 8-bit unsigned values, and write the converted data to a destination buffer.
There are functions to convert minimum coded units with 4:4:4, 4:2:2, and 4:1:1 sampling.
The following formulas are used to convert luminance and chrominance values to red, green, and blue values.
R = Y + 1.402*Cr - 179.456 G = Y - 0.34414*Cb - 0.71414*Cr + 135.45984 B = Y + 1.772*Cb - 226.816
The following formulas are used to convert red, green, and blue values to cyan, magenta, and yellow values.
C = 255 - R M = 255 - G Y = 255 - B
The black (K) channel value remains the same during conversion.