Re: CMYK spaces used for document creation
Re: CMYK spaces used for document creation
- Subject: Re: CMYK spaces used for document creation
- From: Martin Orpen <email@hidden>
- Date: Mon, 2 Nov 2009 19:04:12 +0000
On 2 Nov 2009, at 17:29, Andrew Rodney wrote:
I can’t make too many conclusions because as someone I just
contacted off list correctly suggested, the burden of proof is on
you, the fellow who did the testing. We need more data and
information and ideally some files.
I can't see what the problem is here? Are you unable to accept the
possibility that there are better methods of separating images than
using Photoshop?
Its possible ArgyllCMS is using a different CMM than Photoshop
(which allows you to use several) but unless you hit a bug, the
differences should be tiny and insignificant. There’s no bug in ACE
or the Apple CMM that I know of that would account for what you
report. Considering the tens of thousands, if not millions of images
who’s color spaces are converted by Adobe applications let alone
Photoshop, its pretty hard to believe its a bug in its CMM.
Doesn't have to be a bug does it? You're making the same mistake as
the the designer of the test chart -- treating the conversion engine
as if it plays an insignificant part in the process.
Are you assuming that Adobe have not had to choose between quality and
speed during conversion? Argyll's cctiff allows you to choose between
slow floating point and fast integer routines. What choices do you get
with Adobe products?
It could easily be user error. And the descriptions (bandy and ugly
versus smooth and sexy) make it pretty difficult to understand who
or what’s at fault here.
Photoshop allows the use of Dither, we have no idea if you used it
or not and if that’s an option with Argyll. Dither is almost always
something you want to use for imagery but of course, the one test
you did was on a synthetic test file. One can only guess what’s
going on here based on the limited data you’ve provided. But you
seem pretty convinced that you’d rather have needles stuck into your
eyeballs than use an Adobe product for color space conversions and
you’ve only so far, convinced one human that this is the wise option
to be making.
It may surprise you but I don't think that I'm the only person on this
list who chooses to use alternative software for colour conversions.
I got fed up with separating difficult images 2 or 3 different ways
and then spending ages blending the best bits together.
Having the ability to build gamut maps of individual images and use
device links means that I get the best possible result in minutes
rather than hours.
The resulting separations are significantly different to Photoshop.
More detailed in saturated colours and less prone to clipping so that
they can be enhanced with further retouching if necessary.
--
Martin Orpen
Idea Digital Imaging Ltd
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