Re: Colors: printing vs. on screen

[Christoph Redecker <christoph.redecker@tu-harburg.de>]

>   -- Are "spot colors" the thing to use to get a grip on these matters?

No, because spot colors are used to extend the printable range by colors 
not available in cmyk. You might be able to show such a color on your 
monitor, but not print it.

>   -- Is this generally only a matter of "color spaces" and
> transformations between them?

Yes, because your monitor uses RGB and your printer uses CMYK. The 
conversion between thetwo is not too complicated, but actually getting 
the same output from the two is hard. RGB is an additive model, CMYK is 
subtractive (read about the different models, wikipedia will do). The 
color impression you get by looking at the output is generated in 
completely different ways.

   or ...
>   -- Is this also dependent on specific printer models (eg. different
> office laser printers)?
>      -- If yes, is there any source on information on the pecularities
> of these printers?

Each printer will print slightly different, that's the nature of things. 
Your best bet is to calibrate your monitor (also, search a bit on the 
web for ways to do this). Turn a few of your monitors knobs and see how 
the colors change - now imagine what variables come into play between 
your impression of the color shown by your monitor, the actual data, and 
the impression you get from your printer's output!

You can also try specifying a color in CMYK and see if the output changes.

Regards

Christoph
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