Re: Lightbox - Screen Matches
Re: Lightbox - Screen Matches
- Subject: Re: Lightbox - Screen Matches
- From: Andrew Rodney <email@hidden>
- Date: Mon, 18 Jun 2007 12:36:51 -0600
- Thread-topic: Lightbox - Screen Matches
On 6/18/07 12:10 PM, "Fleisher, Ken" wrote:
> That's exactly the point though. "Based first on the display..." At that
> point, you ARE doing a screen-to-transparency match. If you dim the light
> box, then you are matching something that has an appearance that is too
> dark...
Then you're done.
What you're really doing is making a screen output referred version you
like. What you want is for it to match the chrome. So treat the viewing of
both like a print (note you do NOT have the ability to soft proof based on
output since you haven't defined the output device or profile). You're
viewing the image in some RGB color space (ideally a working space but it
could be the capture color space). When you viewed whatever preview you got
in the scanning software, what did you base this upon for adjustment?
> ... and as a result, your final output--whether internet, offset press,
> photo print, or anything else--is now too dark.
Shouldn't be. Do the numbers in a color managed application like Photoshop
look too dark? Until you include some output device profile into the loop,
we can't possibly soft proof it for ANYTHING but this one device (the
display). So, converting the file to sRGB and viewing it on a color managed
aware browser like Safari, there's a prefect match.
> This
> is what I'm trying to accomplish but there seems to be a gap in the logic of
> the ISO recommendation.
What are you editing for? Obviously you need a good color appearance from
the data as viewed in a calibrated and profiled display preview. From there
you simply can't edit based on any other output device until you define
that, load a profile describing this and setup Photoshop to view it as such.
> Why is it immaterial? The transparency is my color guide that I am trying to
> match everything else to--including my screen.
That's not possible depending on your definition of match. An emissive
display will never perfectly match a reflective print just as a transparency
can't be exactly matched by a press. You've got gamut issues, you've got
contrast ratio issues etc. You can make a display provide a pretty good
indicator of what you'll see on a print when you use all the current tools
we have to do this and there's still some mental adjustments to be made.
If you have a good display profile, a good output profile, proper viewing
conditions and proper setup of soft proofing in Photoshop, you can get
pretty close to producing what appears as a match. But to expect even this
quality of dissimilar media matching you have to define steps you're not yet
able to define, like what you actually want to match the display to. If the
film, look at the scan and attempt to view the chrome such that you get a
closer color appearance visually by playing with the lightbox intensity
(along with looking at your display luminance settings). Just how you
surround the film such that no backlight hits you while viewing could play a
really big factor here.
> It doesn't matter. Let's say the screen image IS my final output and the
> transparency (viewed normally at 1270 cd/m^2) is my original. How can I get
> an ICC color managed workflow to achieve this?
I theory it shouldn't be much different than handling a print. Should the
box be at 1270 cd/m2? I have no idea. I have a GTI booth with digital dimmer
for both reflective and transparency modes. So the ability to dim a lightbox
is possible.
Andrew Rodney
http://www.digitaldog.net/
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