Re: Now then! who knows their stuff?

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Nice try Mr Naj, but not good enough I fear, so your out...

Of course you might care to try again but then I would rather an Amnerican
came up with the goodies because we British have an accepted tradition
regarding the issues discussed in the Penrose Annual, while those pesky
American chappies most certainly do not and the education would do them all
a great deal of good.

Or so I believe?
----- Original Message -----
From: "Nij" <nigel@mwords.co.uk>
To: <epson-inkjet@leben.com>
Sent: Wednesday, April 24, 2002 10:12 AM
Subject: RE: Now then! who knows their stuff?


> hi Dick,
>
> By 'typical' printer profile swatch I take it you mean the Profiler Plus
> swatch print? That actually does have a neutral grey (the very central
> square) it just doesn't look it due to the tricks our eyes play on us. I
did
> a quick check and looked at a couple of swatches that are used by
> professional profiling tools like X-Rite and gretag... and they both had
> neutral and warm grey-scales in them.
>
> Indeed, perhaps this is one area where the Profiler Plus tool could be
> improved? I am guessing a bit that alot of the colours are pushing the
> expected gamut boundaries of a printer to see what is printable... yet
there
> is not enough information 'inside' the gamut to control errr... the
mappings
> required 'within' the profiled gamut.
>
> I'm afraid i can't help you vis a vis the scanner profiling aspect.
However,
> I wonder if indeed you are asking about scanner profiling - or the
> 'translation' of a file in one space to that of another - that which is
> achievable by a printer? If this is the case, as far as I am aware all
> profiles should refer to 'absolute' Lab (?) values... and the way one
colour
> space is mapped to another when displaying on your screen, or printing, is
> down to the rendering intent. i.e. if we handled our files in LAB then the
> gamut of a film scanner would be the same regardless of substrate being
> scanned - BUT if we scan wishing to prdocue a tagged sRGB or AdobeRGB or
> whatever profile, then the way gamut of the scanenr will presumably be the
> subset of colours that lie within the scanners 'hardware' gamut, and the
> imposed limits of the chosen colour-space. Again, some kind of
> rendering-intent calculation will be used to move colours that are inside
> the scanner space, but outside the chosen colour space, into that colour
> space for saving.
>
> Hope that helps... or... something... but I'm guessing really.
>
> nij
>
>
>
>
>
> > -----Original Message-----
> > From: owner-epson-inkjet@leben.com
> > [mailto:owner-epson-inkjet@leben.com]On Behalf Of dickbo
> > Sent: 23 April 2002 18:53
> > To: epson-inkjet@leben.com
> > Subject: Now then! who knows their stuff?
> >
> >
> > When programming, or if you like setting up a drum scanner (and here I
am
> > thinking Crosfield Electronics drum scanners) it is necessary to
> > account for
> > the following....
> >
> > 1: Tone compression
> > 2: Grey balance
> > 3: Colour correction
> >
> > When constructing profiles it is quite easy to understand the issues
> > involved in monitor profiling.
> >
> > When profiling a printer it is not.
> >
> > Where is grey balance catered for when a typical target consists of only
> > colour patches and no neutral grey steps from white to black.
> >
> > When using a scanner where the original density range is beyond
> > that offered
> > by a printing substrate i.e. paper, where is the tone shape
> > calculation when
> > producing a film scanner profile.
> >
> > That will do nicely BUT who is able to answer.
> >
> > Now then, lets talk incentive.
> >
> > I have in my possesion two copies of the 1978 Penrose annual. If
> > you do not
> > know what that is then restrain yourself from answering, but to those
who
> > know and therefore understand and appreciate the sublime quality of this
> > product, the offer is there and the best reply gets the book.
> >
> > Go to it young squires and take the fortune cookie - as you Americans
are
> > wont to say.
>
> -
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-
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