[argyllcms] AW: Re: AW: Re: AW: Re: Question about the principle use of Argyll

  • From: Hermann-Josef Röser <posts@xxxxxxxxxxxxxxxxxxxxxxxxx>
  • To: <argyllcms@xxxxxxxxxxxxx>
  • Date: Tue, 21 Nov 2017 21:15:06 +0100

Good evening Roger,

Even if the "0" in A2B0 means "Perceptual", there is no "obligation" to
NOT use that container for other than Perceptual rendering.

I was not aware of this. Thanks for pointing this out.

Best wishes

        Hermann-Josef
--- Begin Message ---
  • From: "Roger Breton" <graxx@xxxxxxxxxxxx>
  • To: <argyllcms@xxxxxxxxxxxxx>
  • Date: Tue, 21 Nov 2017 21:00:07 +0100
Hallo Herman,

In Photoshop, you open a raw scanned RGB image and *Assign* the ICC Scanner
profile created with Argyll.
If you need to convert, say, to sRGB, you then use the friendly
ConvertToProfile command.

Many ICC scanner profile constructors dump their "data" into the A2B0 tag.
It's a common practice. 
Even if the "0" in A2B0 means "Perceptual", there is no "obligation" to NOT
use that container for other than Perceptual rendering.

If you look at Adobe's ICC profiles, you will noticed that they use the same
"data" to populate all the A2Bx tags (PCS to Device).

/ Roger

-----Original Message-----
From: argyllcms-bounce@xxxxxxxxxxxxx [mailto:argyllcms-bounce@xxxxxxxxxxxxx]
On Behalf Of Hermann-Josef Röser
Sent: Tuesday, November 21, 2017 12:43 PM
To: argyllcms@xxxxxxxxxxxxx
Subject: [argyllcms] AW: Re: AW: Re: Question about the principle use of
Argyll

Hello Roger,

thanks, I will certainly give cctif  a try.

However, this brings me back to my starting point:  How do I then use a
scanner profile created by Argyll for use with e.g. PhotoShop and also
employ a specific rendering intent? According to the documentation, the
scanner profile created by Argyll is always using the colorimetric intent
(although it writes the A2B0 tag ??)? As I had written elsewhere, the
profiles created with Argyll are better than all others I have used thus far
with other software. But I would like to fully understand the complete
system -- including use of the rendering intents.

Best wishes

        Hermann-Josef


--- End Message ---

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