Re: Soft-proofing shadows
Re: Soft-proofing shadows
- Subject: Re: Soft-proofing shadows
- From: Roger Breton <email@hidden>
- Date: Wed, 16 May 2007 22:11:19 -0400
> I am trying to discover precisely what the black point of my monitor is?
> For some reason Colorthink displays my Eye One monitor profile's black point
> as L*0.
Maybe ColorThink is getting its information from the monitor profile? And,
if I recall correctly, not many monitor profiles actually encode the actual
or measure black point of the monitor. So, you'll have to fish that
information elsewhere.
> My understanding of the black point check in Real World Color Management (
> page 216) is to determine how accurately virtual black values of the file
> data ( L*0, L*1, L*2 ...etc) are being mapped to the maximum shadow point
> of the monitor.
Good point.
> But I would like to discover precisely where my monitor
> begins to compress those shadow values.
A valid concern.
> My main concern in soft-proofing
> image files is to see how the conversion will compress tonal distinctions in
> the deepest shadow areas,
We all worry about that too, wanting those shadow details to remain open.
> but I suspect that the black point of the monitor
> is higher than the black point of the printer/paper profile
Higher? Depends how you interpret higher. Usually, it's the other way
around. A press of proof cannot match the black point of a monitor. Maybe
this is different with LCDs, since they have difficulty creating deep
blacks.
> which means I
> may only be seeing how the monitor is compressing printable values it cant
> show me.
Hmmh. Not following. But maybe that's just because I'm tired...
> Admittedly you wouldn't be able to soft-proof accurately on a monitor if its
> black point is higher than the output device,
Right.
> which makes my question more
> or less academic.
It's OK. Those questions trigger my curiosity too ;-)
> In that case the monitor would only provide a reasonable
> simulation of the reproduction curve.
Right. Keep in mind that even if you get it exactly right, in the end, there
is still a lot of room for interpreting the monitor black point, however it
is scaled. But others may disagree with me.
> This is perhaps all it can do. It
> would however be useful to me to know how far apart the printer/paper and
> monitor black points are, this would colour the way I interpreted how the
> screen separates shadow detail while soft proofing.
I like to use Apple's DigitalMeter utility to probe the depths of the
monitor shadows. It shows the RGB value going into the video ram and it is
useful to gain insights into what's going on.
I believe L* is forcing some openess in the shadows?
> Eugene Appert
Regards,
Roger Breton | Laval, Canada | email@hidden
http://pages.infinit.net/graxx
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