Øyvind Kolås    pippin@gimp·org twitter bitcoin patreon  

Spectral ink simulator

Spectral ordered ink/paint soft proofing and separation engine. In the upper left corner we see the substrate, followed by subsequent layers of colorant in the configuration.

original
black.png
# virtual printer configured with one ink, black
illuminant=D65
substrate=white
ink1=black
 
bw-on-green.png
illuminant=D65

substrate=green   # green background

ink1=black
ink2=white
ink2.black=white

chalkandcoal.png
# simulating charchoal and chalk

illuminant=D65
substrate=rgb 1 0.6 0.6
ink1=black
ink2=white
ink2.black=white
cmyk1.png
# simulation using reasonable data;
# gives a quite small color gamut

illuminant=D65
substrate=white
ink1=cyan
ink2=magenta
ink3=yellow
ink4=black
inklimit=2.5
cmyk2.png
# same as previous ink configuration
# allowing only 150% ink on an pixel.

illuminant=D65
substrate=white
ink1=cyan
ink2=magenta
ink3=yellow
ink4=black
inklimit=2.2
cmyk3.png
# white paint + CMY print on black
# 

illuminant=D65
substrate=black
ink1=white
ink1.black=white
ink2=cyan
ink2.black=cyan
ink3=magenta
ink3.black=magenta
ink4=yellow
ink4.black=yellow
inklimit=3.0
cmyk4.png
# using simulated "ideal" inks - giving unnatural
# gamut for CMYK

illuminant=D65
substrate=white
ink1=rgb 0 1 1
ink2=rgb 1 0 1
ink3=rgb 1 1 0 
ink4=rgb 0 0 0

cmyk5.png

# CMYK printing on yellow paper

illuminant=D65
substrate=rgb 1 0.6 0.6
ink1=cyan
ink2=magenta
ink3=yellow
ink4=black
greenblack.png
# duo-tone printing of green + black on white

illuminant=D65
substrate=white
ink1=black
ink2=green

redblue.png
# duo tone printing with red / blue

illuminant=D65
substrate=white
ink1=red  
ink2=blue 

redgreen.png
# duo tone printing with red and green

illuminant=D65
substrate=white
ink1=red  
ink2=green

rgb.png
# printing with red/green/blue inks -
# works quite well for colors in this photo

illuminant=D65
substrate=white
ink1=red
ink2=green
ink3=blue

whiteandgreenonblack.png
# duotone print on top of black

illuminant=D65
substrate=black
ink1=white
ink1.black=white
ink2=green

debugwidth=48
whiteandredonblack.png
illuminant=D65
substrate=black
ink1=white
ink1.black=white
ink2=red

debugwidth=48

These images represents recent advances in these experiments - the current working incarnation of the software is currently not publicly available. /pippin.