Re: Gamut
Re: Gamut
- Subject: Re: Gamut
- From: Marco Ugolini <email@hidden>
- Date: Mon, 09 Jan 2006 18:09:45 -0800
In a message dated 1/9/06 3:49 AM, Richard wrote:
> Here¹s one for Senior Ugolini and should allow him to express the full range
> of his technical expertise, all the way from A¹ right through to B¹
It's Signor Ugolini, for those who appreciate proper Italian. Incidentally,
I am not quite a "Senior" citizen yet...
> Let us imagine I have a dirty great big PC in front of me and I am running
> Photoshop CS2, loads of RAM and all the rest of the old nonsense.
I assume that means a monitor, internal and/or external storage, CD+DVD
reader/writer, maybe a scanner, and some kind of printer (inkjet perhaps?).
> I am going to run an gamut test using three different manufacturers inks, let
> us call them Ink A, B&C..
Given the paucity of detail, we will have to assume here as well, perhaps an
inkjet printer of some make and model (Epson? HP?).
> I have displayed on screen an image with a gamut that exceed all known monitor
> ranges and I select [View] followed by [Gamut Warning].
I will assume that the image is in RGB, perhaps AdobeRGB.
> The display is then modified by some means or other and indicates in the usual
> way that Ink A¹ has some deficiencies in it¹s gamut capabilities.
I'm not clear how you arrive at this determination. There are several
details missing: for example, before you activate the Gamut Warning command,
are you using the View -> Proof Setup -> Custom menu to select a profile to
proof to, one that describes the color behavior of "Ink A" on a given
substrate?
> I then carry out the same activity for each of the other two inks and each
> shows a different level of out of gamut¹ deficiency.
Again, when you do this, do you first select profiles in turn in the View ->
Proof Setup -> Custom menu for each of these two inks on a given substrate?
> Now then, here is my question..
>
> How does Photoshop know which ink I am testing?
If you do this properly (using the View -> Proof Setup -> Custom menu),
Photoshop is simply doing the math according to the contents of the profile
selected.
One last caveat: I have read and heard repeated warnings about using the
"Gamut Warning" command in Photoshop. It seems that Gamut Warning is not
completely accurate in the way it tags colors that are out of gamut in a
given profile. Others may be able to contribute more specific and
authoritative opinions on this specific subject than I am capable of.
Best regards.
--------------
Marco Ugolini
Mill Valley, CA
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| References: | |
| | >Gamut (From: "Richard" <email@hidden>) |