Editing Advanced Coloring (section)

==CMYK-safe Colors==
There are two distinct color spaces on computers: RGB (red-green-blue), which is for screens, and CMYK (cyan-magenta-yellow-black), which is for printing.
Some RGB triplets do not have equivalents in CMYK space. As a result, a figure that looks great on a screen can come out with unpredictable colors when printed.

Most applications do a good job with RGB-to-CMYK conversions for photos, but do not do such a good job with graphics that use pure primary colors. For example, reds are generally OK, but pure blues and greens do not translate very well.

Here are some RGB values that are within the CMYK gamut (i.e. are "CMYK-safe"):
<source lang="python">
#optimized rgb values for cmyk output:
set_color dblue= [0.05 , 0.19 , 0.57]
set_color blue=  [0.02 , 0.50 , 0.72]
set_color mblue= [0.5  , 0.7  , 0.9 ]
set_color lblue= [0.86 , 1.00 , 1.00]

set_color green= [0.00 , 0.53 , 0.22]
set_color lgreen=[0.50 , 0.78 , 0.50]
set_color yellow=[0.95 , 0.78 , 0.00]
set_color orange=[1.00 , 0.40 , 0.0 ]

# these are trivial
set_color red=   [1.00 , 0.00 , 0.00]
set_color mred=  [1.00 , 0.40 , 0.40]
set_color lred=  [1.00 , 0.80 , 0.80]
set_color vlred= [1.00 , 0.90 , 0.90]
set_color white= [1.00 , 1.00 , 1.00]
set_color vlgray=[0.95 , 0.95 , 0.95]
set_color lgray= [0.90 , 0.90 , 0.90]
set_color gray=  [0.70 , 0.70 , 0.70]
set_color dgray= [0.50 , 0.50 , 0.50]
set_color vdgray=[0.30 , 0.30 , 0.30]
set_color black= [0.00 , 0.00 , 0.00]
##
</source>

Note that there are default atom colors such as "carbon", "nitrogen", "oxygen", "hydrogen", "sulfur", etc. which should also be redefined:
<source lang="python">
set_color carbon= [0.00 , 0.53 , 0.22]
etc.
</source>