Re: HowTo? Objectively measure quality of print profiles?
Re: HowTo? Objectively measure quality of print profiles?
- Subject: Re: HowTo? Objectively measure quality of print profiles?
- From: LdaSignup <email@hidden>
- Date: Sun, 05 May 2013 17:34:48 -0600
- Importance: Normal
Perhaps, but ...
Uncle ... mostly ... and thanks for another patient reply to this CM
semi-newbie who is one of those seeking the "holy grail" of "by the numbers"
A little learning (knowledge?) is a dangerous thing ... A. Pope ...
So is a lot. ... A. Einstein :-)
This semi-dangerous, semi-newbie wrt CM will study 28 balls (if possible ...
where?), and Romans 16. Also take a look at one or more ColorThink
you-tubes. I've attempted to read several of the better CM books, but much
was over my head. I'll once again put a "library hold" on one or more of
those books. (done ...)
Some of the analysis just ends up being subjective. Unless all you want to
do with the profiles is solid color patches.
Or synthetic pictures of Balls? or Romans? (no pun/innuendo intended ...
sorry)
But .... suppose the two best profiles you (DigitalDog) made and then
proceeded to evaluate using "28 balls" were noticeably different to a
printing expert such as yourself, but good-to-excellent in their own way.
Would a metric such as AdjSyntheticDe2k + AdjGamutVolume + AdjFleshToneDe2k
+ AdjBanding + Adj??? (a.k.a. half-baked-cm-metric) be of interest?
Suppose one of the two profile you made for a specific printer+paper+ink was
noticeably better for flesh tones to a well-trained eye, and the other was
noticeably better for landscapes/synthetics? Would you advise keeping two
well-labeled profiles?
Could the half-baked-cm-metric serve as a "quick&dirty filter" to remove
obviously unacceptable profiles?
Suppose a non-expert, non-professional printer had less time to pick a
profile than the exhaustive SOP you mentioned? Or less budget for paper +
ink?
Suppose a really thorough printing professional typically made 10+ profiles
for a new combination of printer + ink + paper. Would a
"more-baked-cm-metric" be likely to be among the top three or five?
-----Original Message-----
From: Andrew Rodney
Sent: Friday, May 03, 2013 8:47 AM
To: 'colorsync-users?lists.apple.com' List
Subject: Re: HowTo? Objectively measure quality of print profiles?
On May 2, 2013, at 6:28 PM, LdaSignup <email@hidden> wrote:
Hypothetically, suppose someone claimed that profiles from ArgyllCms are
typically as good or better than those from ProfileMaker-5, and almost as
good as i1Profiler 1.4.2. Is that something that could be objectively
measured by an automated spectro, rather than an informed, but still
subjective, opinion?
Perhaps, but there are a slew of potential 'issues' with color engines that
are seen faster, easier and more totally by looking at images than dE
reports and the like. Output Bill Atkinson's 28 ball's image with two
profiles and examine the blue ball and other balls for smoothness, reverse
banding (bad) or blues shifting magenta as just one example.
Profiles don't know squat about color in context. They treat a white dog on
snow the same as a black cat on coal. They treat individual color pixels
without having a clue about the color image in context making both visual
and number based reporting necessary.
Andrew Rodney
http://www.digitaldog.net/
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