Re: gamut warning failure
Re: gamut warning failure
- Subject: Re: gamut warning failure
- From: Roger Breton <email@hidden>
- Date: Sat, 14 Oct 2006 16:57:07 -0400
Eugene,
Gamut warning is a sensitive issue. I'm not privy to the internals of how
Photoshop's gamut warning does it but I know it is a controversial subject
whenever the subject comes back for discussion.
The way I understand it, the gamut of a device is inferred from a profile
device to Lab table. To my knowledge, that's usually the table used by
ColorThink and other 3D viewers to draw the shape of the device gamut in
OpenGL or other 3D visualization scheme.
Roger Breton | Laval, Canada | email@hidden
http://pages.infinit.net/graxx
> I am wondering if anyone understands the mechanics behind gamut warning in
> Photoshop. It¹s a given that the tool is unreliable for displaying out of
> gamut colours but I am forced to use it since the students I teach have no
> alternatives for targeting files for output. I have been making sample files
> of colours ( within the brightness range of the output profile) that change
> visibly on the screen while soft proofing with relative and no BPC, which
> gamut warning does not show as out of gamut. Inevitably Colorthink shows
> these colours as being out of gamut for the given output profile. But I
> cannot seem to find a logic that would enable me to predict when gamut warning
> is likely to fail. It seems perfectly arbitrary. There doesn¹t seem to be any
> common hue, brightness or saturation placement that increases the possibly of
> gamut warning failure.
>
> Is it possible that this is linked to profile quality or is it just an
> inherent flaw in gamut warning?
>
> I have noticed that many of the out of gamut colours that gamut warning will
> not show are also colours that are out of the monitor range and I wondered if
> there could be a connection.
>
> Thanks for any input
>
>
>
> Eugene Appert
> Montreal, Canada
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