Tell the color management system how to preserve black (K) when
converting color to CMYK.
Normal color transforms first convert to device independent XYZ
using the source profile, then from XYZ to the destination space
using the destination profile.
Since CMYK is an overdetermined colorspace, an XYZ intermediate
value can be converted into a number of different and equivalent
The XRendering.BlackPreservation enumeration may take the
- Off - Do not attempt to preserve black when transforming.
- Intent - Use special rendering intents to preserve black - must
be supported by the ICC profile.
- Plane - for CMYK to CMYK transforms only; run CMY through the
profile, do not change K.
See also the XRendering.PreserveKOptions