100% Black preservation
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 1
in any allowed CMYK color space,0 0 0
in any allowed RGB color space,0
in any allowed Gray color space,1
in[ /Separation /Black ... ]
,1 0 ... 0
in[ /DeviceN [ /Black (colorant1) ... (colorantN)].............].
The resulting color after 100% black preservation is:
c m y 1
in any allowed CMYK color space,0 0 0
in any allowed RGB color space,0
in any allowed Gray color space,1
in[ /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.