RE: Paper Question
RE: Paper Question
- Subject: RE: Paper Question
- From: Roger Breton <email@hidden>
- Date: Tue, 09 Sep 2014 12:45:53 -0400
I think the question of "acceptable" tolerance is up for grabs.
I personally (shame on me if this information exists already!) have not seen a cast in stone criteria for this?
In my humble experience, on almost all printing papers I've seen, a* is always very close to 0.00. So you can ignore it.
L* should be the deciding factor whether to categorize a substrate relative to SWOP3 or GRACoL as far as coated papers are concerned.
The b* component is the killer.
I think the last specs from IDEAlliance, GRACoL2013, have jacked up the b* component to -4.00, to account for the fact that many grades are not as neutral as we would like.
So to "qualify" a grade as being "GRACoL2006", is Plus or Minus 2 "acceptable"?
I'll let the other speak for fear of putting my foot in my mouth publically, even though I have my idea ;-)
Best / Roger
-----Original Message-----
From: colorsync-users-bounces+graxx=email@hidden [mailto:colorsync-users-bounces+graxx=email@hidden] On Behalf Of Mike Stewart
Sent: 9 septembre 2014 12:20
To: email@hidden
Subject: Paper Question
Hello: I will try and simplify this. Let's say I have 20 different press sheet papers and I am measuring the *L*a*b values of the paper in M0 mode to see if they fit under Gracol2006, SWOP3c2, etc. Is there a rule of thumb as to the allowed variance; not a DeltaE variance; but a plus/minus variance?
One paper may be L: 95, a: 0, b: -2 (Gracol2006)
another may be L: 92 a: 1, b: -1 (could be SWOP3v2 or Gracol2006)
So; if Gracol is L: 95, a: -0.03, b: -1.95 can I look at something as simple as
L: 95 +/- 2, a: -0.03 +/1, b: --1.95 +/- 1
Thanks - Mike Stewart
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