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Re: [Digital BW] Re: Profile Confusion

Re: [Digital BW] Re: Profile Confusion

2006-12-07 by CDTobie@aol.com

In a message dated 12/7/06 12:36:19 PM, rgoldman@... writes:


>  I went to image>mode>convert to
> profile. That box has GG2.2 as the source profile, and I changed the
> working space to DG 20. At that point there was no on screen change
> (ie, the image did not look as it does when I choose DD 20 in the soft
> proof set up). So I'm not sure what if happening, and I'm not quite
> sure what to expect to happen.
> 
There should indeed be no change, just as reassigning an sRGB image to 
AdobeRGB will show no change. It has been accurately recalculated to give the same 
results in the new space. Thats a good thing, not a bad thing.

C. David Tobie
Product Technology Manager
ColorVision Business Unit
Datacolor Inc.
CDTobie@...
www.colorvision.com
> 

[Non-text portions of this message have been removed]

[Digital BW] Re: Profile Confusion

2006-12-07 by rgoldman2

But this file, which now has been converted to the DD 20 profile, does
not look on screen they way it did when I was soft proofing in DD 20.
If I soft proof this file in DD 10, it looks right. I want to be able
to send a file that looks like the print.
>

Re: [Digital BW] Re: Profile Confusion

2006-12-07 by CDTobie@aol.com

In a message dated 12/7/06 1:31:25 PM, rgoldman@... writes:


> But this file, which now has been converted to the DD 20 profile, does
> not look on screen they way it did when I was soft proofing in DD 20.
> If I soft proof this file in DD 10, it looks right. I want to be able
> to send a file that looks like the print.
> 

A softproof of one profile to another profile, is a way of saying "I haven't 
converted to this space, but if I did, what would I get?" This offers some 
advantages (in terms of gamut warning tool etc...) but its still an emulation. 
When you convert, you get the actual thing. If you wish to then emulate this 
final space will print like on a particular output device, you can proof that; 
but as for proofing one abstract space from another (like Gray Gamma 2.2 to Dot 
Gain 20%), thats rather theoretical: do the conversion at the same settings, 
and you should get the same results, but even if you don't, what you get is 
what you get, what you emulated... is only an emulation.

C. David Tobie
Product Technology Manager
ColorVision Business Unit
Datacolor Inc.
CDTobie@...
www.colorvision.com


[Non-text portions of this message have been removed]

[Digital BW] Re: Profile Confusion

2006-12-08 by Roy Harrington

--- In DigitalBlackandWhiteThePrint@yahoogroups.com, "rgoldman2" 
<rgoldman@...> wrote:
>
> But this file, which now has been converted to the DD 20 profile, does
> not look on screen they way it did when I was soft proofing in DD 20.
> If I soft proof this file in DD 10, it looks right. I want to be able
> to send a file that looks like the print.
> >
>

I think this missing part of this whole discussion is that there are two modes
in soft-proofing and they have different results.

From you first post I gather you have grayscale images with GG2.2 embedded
profiles.  If you just one the file it doesn't look how you'd like it, but if you
soft-proof in DD20 suddenly it looks correct and matches the prints that you get.
Is this a correct assessment of the situation?

If so, the soft-proofing you are doing is not what people are used to.  Soft-proof
can be set up to CONVERT to the output profile which is just like printing with
the ICC profile.  If you did this with GG2.2 to DD20 you would see identical
screens.  If the screen changes (probably gets lighter) then you have set up the
soft-proof to ASSIGN the output profile rather than convert.   This switch is called
"Preserve Color Numbers" (PCN).  PCN=on means assign-to-profile because you
are not changing the numbers in the file.  PCN=off means convert-to-profile
so that the new changed values give the same luminosity (L-value).   It's really
worthwhile playing with the Proof Setup, PCN and Preview to see the differences.

What I suspect is you have soft-proof with PCN=on and you are viewing the 
file as if it were assigned to DD20.  If so you can just Edit > Assign Profile to 
DD20 and get what you want.  

I'm not sure of your printing workflow.   If you print with say Epson ABW and have
No Color Management selected this Assign to DD20 should have no effect.  But
if you use ICC profiles in printing I'd have to know specifically what you are doing.

Roy

[Digital BW] Re: Profile Confusion

2006-12-08 by rgoldman2

First off, I have to tell you all that I really appreciate the
explanation and advice this post has generate. Roy, you are correct
that  the description of my situation in the first post was that I had
an embedded ICC gg 2.2 profile (which I had set as the default in PS
Color Settings). I also had my screen set up with a custom soft proof
DD 20 profile with PCN on. I did this, not really understanding what I
was doing, because I found that with this set up I could make PS files
that resulted in ABW prints on Premium Semi Matte that pretty much
matched the screen I was looking at. Over the past day, responding to
advice from the group, I have experimented with one worked up image by

1) Changing my PS color settings to grayscale = dd 20 Then opening the
file, getting the profile mismatch message, then opting to convert to
the working space (ie. from gg 2.2 to DD20) then saving that file and
opening it again. At this point the DD20 file is embedded but the file
on screen does not look like it did when I was using the DD 20 soft
proof. I would have to use DD 10 as a soft proof to get the screen
back to where it was.

2) Leaving my PS color settings at 2.2, opening the file (originally
saved with embedded 2.2 profile), and then edit>convert to profile
DD20. The result is the same as above.

I may be shooting for an objective that is impossible and that is
supply a tiff with a DD 20 embedded profile (what the potential
clients require) and have it look on their screen like it looks on
mine when I use the soft proof set up I described above. I.E I would
prefer not to make changes in my PS file since they print well the way
 they are set up now.

I think I understand what has been said about the soft proof approach
I've used resulting in simply a screen simulation. What I don't
understand is why the same device, my screen, looks so different when
I actually embed the DD 20 profile as an ICC profile vs using the soft
proof with PCN. (If I turn off PCN the screen look changes, which is
what I did not like about it in the first place). And I guess that C
David's shirt analogy applies here.

I think I cannot avoid the step I have been loth to take and that is
to embed the DD 20 profile and then apply another curve layer to each
image and adjust for the screen look I want. Correct?

[Digital BW] Re: Profile Confusion

2006-12-08 by Roy Harrington

--- In DigitalBlackandWhiteThePrint@yahoogroups.com, "rgoldman2" 
<rgoldman@...> wrote:
>
> First off, I have to tell you all that I really appreciate the
> explanation and advice this post has generate. Roy, you are correct
> that  the description of my situation in the first post was that I had
> an embedded ICC gg 2.2 profile (which I had set as the default in PS
> Color Settings). I also had my screen set up with a custom soft proof
> DD 20 profile with PCN on. I did this, not really understanding what I
> was doing, because I found that with this set up I could make PS files
> that resulted in ABW prints on Premium Semi Matte that pretty much
> matched the screen I was looking at. Over the past day, responding to
> advice from the group, I have experimented with one worked up image by
> 
> 1) Changing my PS color settings to grayscale = dd 20 Then opening the
> file, getting the profile mismatch message, then opting to convert to
> the working space (ie. from gg 2.2 to DD20) then saving that file and
> opening it again. At this point the DD20 file is embedded but the file
> on screen does not look like it did when I was using the DD 20 soft
> proof. I would have to use DD 10 as a soft proof to get the screen
> back to where it was.
> 
> 2) Leaving my PS color settings at 2.2, opening the file (originally
> saved with embedded 2.2 profile), and then edit>convert to profile
> DD20. The result is the same as above.
> 
> I may be shooting for an objective that is impossible and that is
> supply a tiff with a DD 20 embedded profile (what the potential
> clients require) and have it look on their screen like it looks on
> mine when I use the soft proof set up I described above. I.E I would
> prefer not to make changes in my PS file since they print well the way
>  they are set up now.
> 
> I think I understand what has been said about the soft proof approach
> I've used resulting in simply a screen simulation. What I don't
> understand is why the same device, my screen, looks so different when
> I actually embed the DD 20 profile as an ICC profile vs using the soft
> proof with PCN. (If I turn off PCN the screen look changes, which is
> what I did not like about it in the first place). And I guess that C
> David's shirt analogy applies here.
> 
> I think I cannot avoid the step I have been loth to take and that is
> to embed the DD 20 profile and then apply another curve layer to each
> image and adjust for the screen look I want. Correct?
>

The problem with your (1) and (2) is that they both CONVERT from GG2.2
to DD20.   This changes all the numbers in the image.  What you want is
to just ASSIGN the DD20 profile to your images.   This keeps all the existing
numbers in your image but changes the meaning of the numbers to DD20.
Your soft-proofing with PCN=on using DD20 has indicated that the numbers
in the image are best represented by DD20.

So it's very easy to get exactly what you want:

1) Change Color Settings to DD20 so that this will always be the default.
2) When you read in an image that has GG2.2 tell it to ignore the embedded
profile NOT to convert it.  I.e. Don't Color Manage.   The image should look
just fine now on your screen.  
3) I'd now Assign Profile to DD20.   This will attach the correct embedded profile.
4) Naturally you have to re Save the file.  Note that you've only change which
embedded profile is used not change the actually grayscale values.

At this point you ought to have a file that:  looks correct on the screen without
any soft-proofing,  prints on your machine using Epson ABW exactly as it has
always done, and lastly is exactly what your clients want.

Roy

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