Re: how to assess the quality of a profile?
Re: how to assess the quality of a profile?
- Subject: Re: how to assess the quality of a profile?
- From: Randy Norian <email@hidden>
- Date: Fri, 25 Jun 2004 11:07:35 -0500
Hi Andrew-
Thanks very much for the response-
Yes, basically I am trying to get several printers/ proofers around
town on the same page as far as output. So I have different print
engines, RIPS, etc. I run around and install the same source on all
(my polaproofer source, as I have easy access to it, for profiling and
making test prints) but have very widely-varying results as to the
quality of the emulation.
Visual comparison is OK but when I have 5 prints with varying degrees
of "wrongness" I was trying to develop a statistical method of grading
the emulation. So when I make changes, I can go.. yep, we've gone
forwards on proofer "A" but backwards on proofer "B"
In the end, visual inspection is the ultimate determination. I just
wanted to be able to put a number on it, to help wade thru the early
stages.
I'm trying to isolate whether my profiles have limitations/ errors, or
whether which RIPs simply aren't doing a great job at handling the
conversion, or where I'm going wrong. I'm doing my testing with one
source profile, but when I am done, these proofers./ printers will
probably be asked to routinely emulate other sources. So if it takes a
custom-tweaked source profile to make it work 'acceptably' , that is
the least desirable. If I can fine tune my destination profile so
it's just dead on perfect, I guess that would at least minimize that
part of any error.
So, talking to you makes this clearer to me, I guess what I need to do
is make sure the destination profile is as accurate as I can make it,
as that is what I have the time and luxury of editing.
How do I go about dialing in JUST the destination profile?
As Roger suggested, I am taking my custom-built Lab file and separating
it for the various printers (using their profile to convert and I made
all the profiles in Profilemaker Pro 4.1.5) , and measuring what comes
out. Then I edit as needed to get a closer match?
Can I assume that Photoshop's CMMs are beyond reproach when it comes to
this process?
Thx!
Randy Norian
On Thursday, June 24, 2004, at 01:54 PM, Andrew Rodney wrote:
If I'm understanding what you wish, it's to make printer A simulate
printer
B? If so, you almost always need a round or 3 of profile editing
(usually
just selective color tweaks).
Or are you asking for statistical data on why the prints don't match?
Not
that getting this will aid in making them match but it might let you
know if
one profiling package might get you closer "out of the gate" then
another.
Or course you could just look at them and see this.
Randy Norian
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