Re: black generation with light black inks
Re: black generation with light black inks
- Subject: Re: black generation with light black inks
- From: Lee Badham <email@hidden>
- Date: Mon, 5 Jun 2006 16:53:02 +0100
Hi,
We definitely need to keep black generation for inkjet printers and
presses apart. They are totally separate things to deal with. Here we
are talking about an inkjet printer that has 2 or 3 black inks so we
can take advantage of using the light black inks to give us a nice
neutral with sacrificing dot quality ( i.e. grainy prints).
So I normally try and use as much black as possible in my profiles.
For RIPs that do their ink limiting before the profile is created -
so that we would use a TIL of 400 for your profile I'd use a black
start of 0, and use MaxK as my separation and select maximum width also.
For RIPs that limit the ink from the profile, I'd probably use GCR4,
black start 0 and maximum width.
Smoothness is the key. Any sharp changes in the separation curve is
likely to introduce banding in our prints.
Here's an example using ISO Coated ( a press profile) and an Epson
4800 RIP profile converting from a Lab value using Absolute
colorimetric rendering intent
Lab value 50 0 0
ISO Coated 48 40 40 23
Epson 4800 26 26 7 41
Much more black using the Epson profile.
I use GretagMacbeth Profilemaker 5 to generate CMYK profiles.
Lee Badham
Bodoni Systems Ltd
www.bodoni.co.uk
On 3 Jun 2006, at 23:22, Roberto Michelena wrote:
Back in the old days of Epson 5000, with a single black ink and big
ugly dots (compared to nowadays), it was recommended that for color
proofing black generation was set to start at about 60% or more, and
as narrow range as possible. The small potential unstability that this
would cause was preferrable to the disturbing appearance of those
black dots everywhere.
Now dots are quite smaller, and to add to this, we have not only
"light black" but "light light black" too.
So, what are people using for black generation when building
profiles for:
- Ultrachrome (black + light black) or similar inksets in other brands
- K3 (black + light black + light light black) or Canon Lucia that
also has three levels of black
?
I'd guess 30% start for the Ultrachrome and 10% start for the K3...
but maybe with K3 you can even start black at 0%?
Would "0% start, maximum GCR and maximum black width" still produce a
nice result with K3?
Anyone has done careful comparison to see what's the best route?
best regards,
-- Roberto Michelena
Infinitek
Lima, Peru
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