[argyllcms] Re: Printer: CMYK or CcMmYK or ...
- From: Geert Janssens <info@xxxxxxxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Sat, 21 Feb 2009 16:21:12 +0100
Claas, Alastair, Clemens,
Thank you for your replies, this clarifies a lot for me.
Now on to the applied printing questions... :-)
First some introduction:
My wife has got a jewely shop. The new printer I'l looking for will mainly be
used to print pictures of (18ct) gold and silver jewelry. Particularly the
gold items seem to be difficult to get right on paper. Traditional 18ct gold
is yellow(ish). But different casts exist: there is yellow gold, red (or pink)
gold and white gold. As the names already suggest, the color red (or pink)
gold is more to red/orange, because it's pure gold mixed with copper, while
while gold is more whitish/blueish due to the addition of pure silver.
Especially the color shift from yellow gold to red gold is subtle.
You can for example take a look at the pictures on this webpage
http://www.goudsmid.be/kristaengrety/uniek.php?lang=en
to see what I mean. (By the way, I haven't color corrected these images,
they're displayed as given to us by the photographer, which has tweaked them a
bit).
Now I wonder, if getting a printer with a wider gamut (due to additional R,G,B
and/or orange inks) could theoretically improve the printing of such images a
lot ?
It mainly boils down to the question of which areas of the gamut are enlarged,
and wether my images have colors in that extended range, right ?
Is there a way to make some upfront educated guesses or measurements
concerning this ?
Thanks,
Geert
On Saturday 21 February 2009, Beisch Clemens wrote:
> Hello Geert,
>
> I split your question into two parts.
>
> 1. Photo Printers:
> Indemendent of printing technology, amount of used colors and so on,
> a photo printer is a device that outputs images in photo quality.
> There for you can use papers with the look and feel of a classic
> photo (high glossy, semi matt, etc.).
> A photo printer delivers printouts without visible dots and should
> use color pigments for long life archivation.
> The color gamut on photo paper should be simular or larger as a
> classic photo print.
> It doesn't matter if the technology uses CMYK, CcMmYKk or what ever.
>
> 2. Colors of an Inkjet Printer:
> CMYK and CcMmYKk is the same from the point of colormanagement.
> The use of a full color like C together with a light color c is only
> to eleminate visible dots.
> For example, to print 20% Cyan with a CMYK device, the printer output
> are a few little points of C on the white paper.
> If you are printing a big area of 20% Cyan you will see the dots.
> With a CcMmYKy device, light cyan or a combination of C and c will be
> used to print this color.
> More ink is used to print and you will see no dots.
>
> The combination of C anc, M and m, K and k is done by the printer
> driver (or RIP software) and you don't have to care about this by
> making an ICC profile.
>
> Regards,
>
> Clemens Beisch
> http://colorxact.net
>
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