Canon BJC-620 Properties
--Graphics and Color
--Halftoning
--Smooth, patterned, solid.
Of course Canon does not know what they are talking about.
No 3 (nor 4, nor 6) ink printing device is capable of printing shades of
color. The only way to make it look like it does is by halftoning. Your ink
dot pattern is halftoning. It may not be four superimposed diamonds at
different angles like you seem to think is the only kind there is, but it is
halftoning. If it wasn't you could not get shades of color. The screening is
simply the way of saying how coarse, or fine, the pattern is. The term is
used because in the traditional printing industry they literally used a
screen to break the image up into dots in the platemaking process. The fact
that digital printing does not use a physical screen does not mean it does
not use halftoning.
A RBG Printer does not print one color. You will always get a red, a blue,
and a green dot. So your test is meaningless. Some of the better printers
add a black dot for shading. The squirt of ink is far bigger than the
stepping rate of the head which is what is listed as DPI. A halftone dot is
made up of many squirts of ink and has little to do with the DPI rating of
the printer. Looking at prints with a loupe shows that, at least on my
printer, the three color halftones do not overlap. Also, unless you are
printing separations to use in another process, the final print always
contains all three halftones (four on a CMYK printer).
If your customers want to see traditional 0, 15, 30, 45 degree halftone
color separations they are not going to get them from a digital pritner, but
to say digital printers don't use halftones indicates little understanding
of the nature of printing.
Credentials (as if needed): I was at one time a stripper/platemaker in the
printing trade.
--graywolf
-------------------------------------------------
The optimist's cup is half full,
The pessimist's is half empty,
The wise man enjoys his drink.
----- Original Message -----
From: John Mustarde <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Tuesday, November 20, 2001 8:13 PM
Subject: Halftone Screens from Inkjet Printers?
> On Mon, 19 Nov 2001 20:34:18 -0500, you wrote:
>
> >your digital printer does use a halftone screen for anything
> >other than line graphics. It is built in.
>
> I don't know of any inkjet printers that actually can generate a
> traditional halftone screen.
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