This page applies to Harlequin v13.1r0 and later; both Harlequin Core and Harlequin MultiRIP.
100% black preservation preserves a 100% black value in the output color of a transform.
To clarify the meaning of a 100% black object, it means an object painted in one of these color values:
-
0 0 0 1in any allowed CMYK color space, -
0 0 0in any allowed RGB color space, -
0in any allowed Gray color space, -
1in[ /Separation /Black ... ], -
1 0 ... 0in[ /DeviceN [ /Black (colorant1) ... (colorantN)].............].
The resulting color after 100% black preservation is:
-
c m y 1in any allowed CMYK color space, -
0 0 0in any allowed RGB color space, -
0in any allowed Gray color space, -
1in[ /Separation /Black............] -
1 c1 ... cN in [ /DeviceN [ /Black (colorant1) ... (colorantN)]...........].
where some non-black output color values are not necessarily zero due to a color managed white. 100% black preservation is enabled with the Black setinterceptcolorspace key:
<< /Black false >> setinterceptcolorspace
The sense of the Boolean is best thought of as “color management does not apply to 100% black color values”.
Some examples of object based black preservation:
<< /Black << /Text << /Default false >> >> >> setinterceptcolorspace
<< /Black << /Text << /RGB false >> >> >> setinterceptcolorspace
which respectively enable 100% black preservation for all Text, and only for RGB Text objects.