The history of luaTEX 2006–2009 / v 0.50 - Pragma ADE

white black t-green a=1.000 t=0.500 r=0.000 g=1.000 b=0.000
white black t-blue a=1.000 t=0.500 r=0.000 g=0.000 b=1.000
Because transparency is now separated from color, we can dene transparent behaviour
as follows:
\definecolor[half-transparent] [a=1,t=.5]
Implementing process color spaces was not that complex, but spot and multitone colors
took a bit more code.
\definecolor [parentspot] [r=.5,g=.2,b=.8]
\definespotcolor [childspot-1] [parentspot] [p=.7]
\definespotcolor [childspot-2] [parentspot] [p=.4]
The three colors, two of them are spot colors, show up as follows:
color name transparency specification
white black parentspot r=0.500 g=0.200 b=0.800
white black childspot-1 p=0.700
white black childspot-2 p=0.400
Multitone colors can also be dened:
\definespotcolor [spotone] [red] [p=1]
\definespotcolor [spottwo] [green] [p=1]
\definespotcolor [spotone-t] [red] [a=1,t=.5]
\definespotcolor [spottwo-t] [green] [a=1,t=.5]
\definemultitonecolor
[whatever]
[spotone=.5,spottwo=.5]
[b=.5]
\definemultitonecolor
[whatever-t]
[spotone=.5,spottwo=.5]
[b=.5]
[a=1,t=.5]
Transparencies don't carry over:
color name transparency specification
white black spotone p=1.000
108 Colors redone