On 05/03/2012 09:50, "James E. Therrault" <mjrtas...@gmail.com> wrote:
> Back in the ancient computer days, I had a H/P Deskwriter that only had CMY
> (single cartridge) and it was the cat's butt then. Color work was not
> brilliant but I never had a bit of trouble with it. Later, I "upgraded" to a
> newer CMYK unit and it gave me nothing but grief! So much so that I vowed to
> never use another H/P product ever. And I haven't.
>
> In theory, CMY should produce perfect colors including black and it does so in
> traditional subtractive photographic processes just as RGB works in the
> additive processes. But it does not in the print process where every color
> media needs a black "kicker" to really make it work.
>
> JT
>
> (Who remembers many years in the photography and printing biz...)
I wonder if you've got me beat? I have 46 years in the photo/printing
biz from an apprentice at 16 through letterpress (Heidelbergs and
Glockners), Litho (Heidelbergs and Fuji) to densitometer controlled limited
edition printing for the Fine Art Trade Guild. Switched to prepress and
management with Dainippon galley cameras, drum scanners and final film
planning - then switched to study with an MA (now an MSc) in Digital Imaging
at the London Institute. I also had a Deskwriter - a 510 model with black
only and upgraded that to an A3 Epson 1200 with 6 colour printing.
The subtractive CMY model in photography is not comparable with the CMYK
print process as it uses continuous tone and specially coated materials to
give it a much wider gamut of colours - print processes use plain paper and
the tones have to be generated by dots to fool the human eye. Also the CMY
inks for printing were never really perfected due to the wide choice and
quality of papers and methods like gravure and web and the difficulty of
printing heavy wet on wet areas - drying time was a big bug to printers thus
the 100% black with maybe a ?% tint of C, M or Y or all three to produce a
'rich black'.
I've never come across a CMY inkjet printer but obviously they must
exist if you had one - they perhaps didn't last long as less colours seem to
contribute less to the final image in inkjet even with the coated paper.
Epson have some models which utilise 2 greys and black to produce better
quality monochrome - not unusual as high quality B&W printing of
photographic books also used duotone and tritone. If only I could justify
buying one.....
<http://en.wikipedia.org/wiki/CMYK_color_model>
Pete
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