Re: Colormanagement: Bugs, bugs, bugs ... :-(
Re: Colormanagement: Bugs, bugs, bugs ... :-(
- Subject: Re: Colormanagement: Bugs, bugs, bugs ... :-(
- From: Tom Lianza <email@hidden>
- Date: Mon, 31 Jan 2011 07:38:04 -0500
- Thread-topic: Colormanagement: Bugs, bugs, bugs ... :-(
Klaus,
Thanks for the good work. We've been doing similar testing at X-rite and it
is absolutely painful to look at the state of the art at the low end-middle
end of the markets. At the ICC meeting I will be proposing the formation of
an Industry Outreach Working Group which would collect input like yours and
funnel to the appropriate ICC members directly. I hope if we can show firm
examples and present them in a sound technical forum rather than customers
shouting at vendors, we can start to get these problems classified and
fixed.
If you think what you are seeing is bad, take a brief look at management of
spot color...I am depressed.
Regards
Tom Lianza
On 1/31/11 6:41 AM, "Klaus Karcher" <email@hidden> wrote:
> Hi List,
>
> I hope your weekend was better than mine. Mine was dreadful because I
> stumbled from one bug to the next.
>
> I've uploaded some test files and screencasts to document the issues,
> therefore I just want to outline them briefly.
>
> 1.) Photoshop's Color Settings Panel has serious bugs. Sometimes the
> panel neither reflects Photoshop's actual settings nor the
> synchronization state correctly. As soon as one starts to play with
> conversion options (e.g. toggles compensate for scene-referred profiles
> and black point compensation or changes the rendering intent), Photoshop
> behaves more or less erratic. It can happen that Photoshop ends up in a
> state where neither the display nor the results are correct or where the
> display is correct, but the Lab values in the info panel are wrong.
> These nasty bugs should be fixed as soon as possible, the more so as
> they date back at least until CS4.
>
> 2.) Some profiles seem to trigger Photoshop's
> scene-referred-to-output-referred compensation by mistake.
>
> 3.) Even though the "compensate for scene-referred profiles" setting
> seems to be part of the Color Settings File and hence should be
> synchronized across all CS applications, it can cause inconsistent
> results. Either InDesign and Acrobat simply ignore the setting or they
> are not "bug-compatible" with Photoshop.
>
> 4.) The PDF/X-4 Preset in CS5 is buggy: The embedded profile is based on
> FOGRA39, but the Output Condition Identifier is "FOGRA27".
>
> 5.) The profiles that trigger Photoshop's scene-referred profile
> compensation also cause trouble in Apple's applications (Preview,
> QuickView, ColorSync Utility). Depending on the white point of the
> Monitor Profile the consequences can range from nearly invisible to
> dramatic.
>
> 6.) The profiles in question are completely ICC v2 compliant (verified
> with the ICC reference implementation "SampleICC-1.5.2"). The only
> remarkable peculiarity is that their Media White Point slightly exceeds
> Y=100.
>
> 7.) There is a rendering bug in ColorSync Utility 4.6.2 (Mac OS 10.6.6):
> the 3D view shows wrong colors and transparency and does not resize
> correctly.
>
> Here are the screencasts and test files:
>
> <http://www.screencast.com/t/I7icpG0r9>
> <http://www.screencast.com/t/ETVRrCMM>
> <http://www.screencast.com/t/5zJNzRdAbDB>
> <http://digitalproof.info/colorsync-users/CS_testcase/test1.tif>
> <http://digitalproof.info/colorsync-users/CS_testcase/test2.tif>
> <http://digitalproof.info/colorsync-users/CS_testcase/test.pdf>
> <http://digitalproof.info/colorsync-users/CS_testcase/p954n.L.spdb.boileddown.
> icc>
> <http:///digitalproof.info/colorsync-users/CS_testcase/p954n.L.spdb.boileddown
> 2.icc>
>
> I hope that at least some of these bugs will get fixed soon. IMHO they
> demonstrate clearly the disastrous situation of current Color Management
> implementations: The workflows are extremely fragile, bugs lurk at every
> corner and the chances to get accurate, predictable results with complex
> workflows are rather small. Late binding does not even work reliably on
> "Planet Adobe" -- I really don't want to know what else can go wrong
> when other software (CMMs, RIPs, ColorServers, PDF workflow solutions,
> printer drivers, ...) comes into play ...
>
> Klaus Karcher
>
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