Hi Geoff
nice work on your website
On 22/11/02 at , Geoff Dor� <> wrote:
> >The "cold-ness" you mention may be because you haven't enabled
> >monitor compensation ... try it.
>
> I will - would welcome comments from others about this
here goes then
others have written most of what's relevant so I'll try add to that
rather than repeat it
Colour Management / image exchange protocols depend on the accurate
description of the characteristics of each device in the chain. eg. a
printer, a monitor, or perhaps a - let's consider a scanner which has a
magenta bias in shadow areas:- By scanning a known target and comparing
the captured data to the reference data for that target we can build a
table [a profile] which can be used to remove the scanner's
idiosyncracies from any subsequent scan. Same goes for other devices,
including the monitor screen.
OK, back to Monitor Compensation:
Geoff writes:
[about whether to check <display using monitor compensation>]
> - - is this the general consensus? I seem to be getting different advice
> from different experts..... even the 'Bible' (Photoshop 6 - Martin
> Evening) only mentions it once but doesn't say whether it should be
> ticked or not ticked.....
It's proabably not specified in the Photoshop 6 book because it's not
an option in Photoshop 6 ;-}
If you don't check <Display using Monitor Compensation> in PS5.x the
Display's profile is not used by Photoshop and, irrespective of the
origin, the image data is sent straight to the screen with no
<compensation>. This accounts for the way that files from different
sources have different, perhaps unexpected appearances. Also it's
pretty scary when you buy a new screen and all your files look
different.
Think of unchecking <Display using Monitor Compensation> as a loading a
gun and handing it to a monkey, it might not go off, but then again - -.
Device compensation [see scanner scanario above] is what device
independent colour is all about, it's an important feature of modern
digital imaging.
Later versions of Photoshop do not provide the uncheck option.
Of course you'll need a good monitor profile to make <Display using
Monitor Compensation> work right.
I think you would find all this a lot easier to deal with if you had
Photoshop 6 or even better 7 since it has an <Assign profile> feature
which is VERY useful when dealing with incoming files either with no
embedded profiel or with an incorrect embedded profile.
Geoff writes:
> have noticed that embedding profile with the scanner software is
> optional anyway (not sure how that box got ticked!...) and the scanner
> help file.... well, doesn't really help enough - tried embedding
> 'Generic Monitor AdobeRGB1998 WP6500 Gamma2.2' which matches my PS5 RGB
> set-up exactly, but still got a profile mismatch warning
you get the mismatch warning because it's probably not named quite the
same.
Embedding a workingspace may not work anyway - why? because the
workingspace profile is not a profile of your scanner. A conversion
needs to be made, from scanner <colour space> to Workingspace.
> and convert/don't convert, which is a bit confusing - as is most of
> this colour management stuff.... :-( - maybe I should not embed
> any profile via scanner at all?
If you want to embed a profile at scanning stage [and you should] you'd
ideally want to know that the profile was a proper representation of
your scanner's performance, that way when you open, get a mismatch
warning and ask Photoshop to convert, it's converting from a known and
correct datum point TO your chosen workingspace. [the only way to be
sure the profile represents ther scanner properly is to make a profile
of your scanner [I can do that for you if you like].
If you have no scanner profile, then you need to try various ones
[usually the workingspaces] to see which suits your scanner best, this
is best done with Photoshop 6 and later since it allows real time
<assign profile> tests [whilst observing appearance onscreen].
Shangara wrote
> However, as he said, and I've said the same thing, color management is
> more streamlined in Photoshop 7. You can also view documents in
> different color spaces at the same time and that can be very useful.
I'd agree
buy Photoshop 7, you'll love it. Colour management is a fantastic tool,
it enables passing on of image data between devices and between users
without the inevitable damage of continuous adjustments.
Hope it helps, why not have a look at my site, lots to read there.
Regards
NeilB
- - - - Consulting in Imaging & Colour Management - - - -
custom scanner and printer profiles, training on Trident & Imacon Scanning
- - - - - we supply Gretag and eyeOne, also XRite & OptiCal - - - - - -
p:44 (0)1273 774704 m:44 (0)7778 160201 http://www.neilbarstow.co.uk/
http://www.apple.com/uk/creative/neilbarstow/
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