Re: US Sheetfed Coated v2 TR001?
Re: US Sheetfed Coated v2 TR001?
- Subject: Re: US Sheetfed Coated v2 TR001?
- From: Jim Rich <email@hidden>
- Date: Wed, 07 Apr 2004 16:20:10 -0400
On 4/7/04 8:36 AM, "Roger Breton" <email@hidden> wrote:
>
> My guess is that the
>
> solid densities are some thing like this C= 1.4, M=1.3, Y=1.0 K-1.5. And
>
> the dot gain is around 20%. I am sure mileage will vary.
>
>
>
> My .02
>
>
>
> Jim Rich
>
>
Jim,
>
>
Are you sure you have those last figures right? I would expect magenta to be
>
higher density than cyan. That's what I see at most printing outfit,
>
personnally. And SWOP and Gracol's density guidelines are like that. I have
>
not checked ISO-12647 data to see if I can push the generalization. I've
>
always been under the impression that, maybe for ink tack formulating
>
reasons, that cyan density ought to be lower than magenta.
>
Roger,
Like I said, solid densities are some thing like this and I did say that
mileage will vary.
However, as Terry suggested I did have a typo for Magenta value that I
posted. It was low by at least .1 density unit. And some might say by.2.
So I should have stated the Mag solid ink density I was suggesting to be
something around 1.4 + or- 0.05 . And the Gracol values are 1.5 D for
magenta.
I was going a little too fast on that one, sorry.
But, let me say that the information I posted is based data that I have
collected from going to trade shops and printers over the last 30 years. I
have kept track of printing variables like color separations and print
characteristics for offset and gravure printing processes. And as I look at
it more, a lot of it is based on 150 lpi screens though there is 133 lpi
and 175 lpi data.
And while it might be different than what some expect by looking at the
numbers of things like SID and Dot Gain. The data that I have collected
related to making color separations and keeping track of things like tone
reproduction and gray balance, then, noting the color results and then
noting the SIDs and dot gain that make the good printed results is why I
posted those values.
But what is kind of interesting is the recent post by via Roger
about sheet fed densities
>
ISO 12647/2 sheet-fed densities for a Type 2 paper, Status T without
>
polarisation, are
>
>
C 1.38
>
M 1.33
>
Y 0.96
>
K 1.48
As for the dot gain, know one seems to know exactly what the value is for
Sheet fed coated v2?
So again in my experience with quality sheet feed printing has indicated
that around a 20% dot gain is a very good target (for 150 lpi screen) that
seems to get a good results especially with the traditional tone
reproduction and gray balance that is built into the Sheet fed coated v2
profile.
Jim Rich
_______________________________________________
colorsync-users mailing list | email@hidden
Help/Unsubscribe/Archives:
http://www.lists.apple.com/mailman/listinfo/colorsync-users
Do not post admin requests to the list. They will be ignored.