Re: Guidelines for color safety in color management unfriendly environement?
Re: Guidelines for color safety in color management unfriendly environement?
- Subject: Re: Guidelines for color safety in color management unfriendly environement?
- From: Roger Breton <email@hidden>
- Date: Mon, 27 Sep 2004 15:02:54 -0400
Thomas,
A) If I observe an RGB image strictly for the purpose of getting the best
color matching to the screen, (please correct me if I got this wrong again),
there is no black point compensation involved here, between the Source RGB
profile and the Monitor RGB profile. Whathever Source RGB Black is mapped to
wathever Destination RGB Black, right? And there is no need for BPC here.
B) If I observe the same RGB image to simulate CMYK printing, then, yes, I
see thatttt Black Point Compensation is applied implicitely in this workflow
to the screen. And thank's for straightening me up with regards to the Ink
Black behavior as it does scale the Source black point into the Monitor
space so that the Source black does not end being mapped to the Monitor
black.
C) If I observe a CMYK image this time, by default, I can see that Photoshop
is doing Black Point compensation to the screen. A trip through the
ProofSetup brings this back to "real life" appearance when the user checks
the Ink black setting though as you aptly pointed out.
Well that's a lot of color magic going on behind the scenes, I'll admit.
Thank's for your kind help!
>
> As far as I can tell, Black Point compensation is not ON *until* the user
>
> checks off Ink Black in View>ProofSetup.
>
>
Black point scales the source black to destination black (and then some)
>
right?
>
If you softproof something with a black point which is l 15 (say) you would
>
expect this black to be rendered as a dark grey on screen. It isn't though
>
it's rendered nicely black. This is because of the BPC scalinig L15 to
>
monitor black.
>
>
However when you hit the ink black you DISABLE BPC and get the washed out
>
black you'd expect from a RelCol conversion from something with a L value
>
somewhat over L 0...
>
>
Thomas Holm / Pixl Aps
Regards,
Roger Breton | Laval, Canada | email@hidden
http://pages.infinit.net/graxx
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