Digital BW, The Print

>>AdobeRGB = 2.2 Gamma,
> sRGB = 1.8 Gamma.

No, actually both sRGB and AdobeRGB are gamma 2.2, whitepoint 6500K... 
the difference is in the gamut, not the gamma...

C. David Tobie
Product Technology Manager
ColorVision, Inc.
CDTobie@...
www.colorvision.com

-----Original Message-----
From: Paul Whiting <paulmwhiting@...>
To: DigitalBlackandWhiteThePrint@yahoogroups.com
Sent: Sun, 14 Oct 2007 3:45 pm
Subject: Re: [Digital BW] Piezography BW ICC possible with QImage 
instead of Photoshop?






--- In DigitalBlackandWhiteThePrint@yahoogroups.com, Ernst Dinkla
<E.Dinkla@...> wrote:
>
> Paul Whiting wrote:
> > Greetings,
> >
> > Just acquired an Epson 1280, with two sets of Piezograpy BW ICC 
carts,
> > the CD, all for $100. Didn't think I should pass that up. The
> > printer's hardly been used and the carts are in their sealed plastic
> > envelopes.
> >
> > Now what.. I see in the docs I'm supposed to use the Color Settings 
in
> > Photoshop, but I have Elements and its Color Settings are very
> > spartan. The docs tell me I can use other imaging software by 
studying
> > the settings for Photoshop and using their equivalents in those
> > applications. I do have QImage... I looked at its menus and I see 
some
> > parallels. But I could use some help here... has anyone used Qimage
> > for this particular Piezography?
> >
> > I would still use Elements for its other features, cropping, sizing,
> > etc. but then I would think I could print the PSD files in QImage,
> > using its color settings instead.
Thanks very much, Ernst, I'm going to have to study your answer. I'm
still learning what all these terms mean!

Paul

> > I'm a newbie... lots to learn. Thank you all in advance!
>
> Several things to think off.
>
> Greyscale images is no option in that Elements>Qimage
> workflow. But neutral RGB is.
>
> Elements uses AdobeRGB when best CM is chosen in color
> preferences. It gives you a choice to assign sRGB or
> AdobeRGB to an image that has no profile assigned when
> opened but doesn't give that choice when the image has a
> profile assigned. It will save that file again with the
> profile it originally had or got when opened. Elements is 8
> bit color RGB only which shouldn't be  a problem with Qimage
> as it is 8 bit color RGB only. I do not know what color
> space is recommended for Piezography, AdobeRGB = 2.2 Gamma,
> sRGB = 1.8 Gamma. You better save as a Tiff and not as PSD
> as Qimage isn't that reliable with PSD (for example size
> issues).
>
> Qimage may have a problem with the Piezography profile if
> perceptual rendering + BPC is chosen. At least it has that
> problem with the QTR profiles but I do not know whether they
> are alike on that aspect. If there are issues with low Dmax
> and shades not fitting properly then try some alternatives
> like BPC off and Relative Colormetric with and without BPC.
> For the rest it is as usual: driver CM control off and
> Qimage CM control on.
> Be aware that if you do not have an embedded profile in the
> image Qimage will look for EXIF data to make a good guess
> what profile it should be and if no EXIF data is available
> it will assign a profile automatically. sRGB by default but
> that preference can be changed in the color management settings.
>
>
> --
> Met vriendelijke groeten,  Ernst
>
>
> |  Dinkla Grafische Techniek  |
> |     www.pigment-print.com    |
> |             ( unvollendet )            |
>




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