Re: Conceptual questions

[Florian Höch <lists+gnome-color-manager hoech org>]

Am 02.07.2010 17:26, schrieb Richard Hughes:
> On 2 July 2010 16:07, Florian Höch<lists+gnome-color-manager hoech org>  wrote:
> > For proofing, without BPC is a must of course. But for image ->  arbitrary
> > display/output space, defaulting to BPC "on" for relative colorimetric seems
> > to be the right choice (and will surely avoid some "why are my blacks
> > crushed" cries from users :)).
>
> So, for 'Print Preview' these make sense:
>
> perceptual
> relative-colormetric
> relative-colormetric-bpc
> saturation
> absolute-colormetric
>
> and for 'Display':
>
> perceptual
> relative-colormetric
> saturation
> absolute-colormetric
>
> I'm not completely sure of all the nuances of BPC myself, so I would
> certainly appreciate any pointers and corrections. Thanks.

Actually, for both print preview and display BPC can make sense, it all 
depends on the combinations involved (always assuming the print preview 
intent is for the image -> simulated device transform, not the simulated 
device -> display transform). The key is when print preview is used, the 
transform to the display must not use BPC (or perceptual/saturation). 
But when print preview is not used, then BPC makes a lot of sense for 
display imho, to avoid crushed blacks (e.g. conversion from a working 
space like AdobeRGB with 'zero' blackpoint to a display profile with 
'lighter' blackpoint). I hope I'm making sense.

--
Florian Höch
http://hoech.net