Re: PDF Color Space
Re: PDF Color Space
- Subject: Re: PDF Color Space
- From: Karl Koch <email@hidden>
- Date: Mon, 14 Sep 2009 18:30:11 +0200
Hi Todd,
What device link technology did you use to get those values? Is this
a commercially available DVL or did you make this yourself? If so,
how did you make it?
It is commercially available, it´s named dragLINK and sells for € 300,-
Forgive my presumption, but I doubt David, (or most photographers)
have the ability to cook up a custom DVL. I have tools to make
Device links but all my tools allow are slight tweeks of a standard
ICC conversion, nothing as robust as the numbers you are posting.
Please tell!
I strongly believe that anybody can make a DVL with dragLINK. It´s
drag-and-drop (as the name indicates) an input profile on the left
drop-zone and an output prfile onto the right drop-zone. Even the name
for the DVL is being suggested (with the option, but not the necessity
to change it) automatically.
I downloaded the test file you link to and converted sRBG in
Photoshop. I can confirm that there is no difference between
perceptual & relative colorimetric rendering, but I also don't see
any problem with the conversion that Photoshop does. I don't see any
loss of detail or significant color shifting when I convert to sRGB,
so I'm not quite sure how a device link would improve this. Can you
post a visually compelling example of a device-link doing a better
AdobeRGB -> sRGB conversion than photoshop?
Most probably you don´t see a difference when converting to sRGB for
one reason: Your monitor doesn´t show the details in saturated
AdobeRGB anyway. So there is no difference after converting to sRGB.
If you use the color picker you will see that the first 2 patches in
the first 2 Delta (RGB)=64 boxes, which I used for my example, are
different in AdobeRGB, but not after conversion to sRGB.There is
detail in the file, but admittedly not on the monitor, unless you have
a REAL wide gamut monitor.
But not seeing detail on the monitor doesn´t mean that you don´t want
to see it in print or on the web. So, converting perceptually is the
right thing to do. And that´s what I wanted to point out:
You cannot convert perceptually with matrix profiles. You need to
recalculate gamut mapping and that´s what happens when building an ICC-
DVL.
The situation is bad enough in AdobeRGB-sRGB conversions, but wait and
see, what happens in a ProPhotoRGB-sRGB conversion ;-)
Best regards,
Karl
-Todd Shirley _______________________________________________
Do not post admin requests to the list. They will be ignored.
Colorsync-users mailing list (email@hidden)
Help/Unsubscribe/Update your Subscription:
This email sent to email@hidden
_______________________________________________
Do not post admin requests to the list. They will be ignored.
Colorsync-users mailing list (email@hidden)
Help/Unsubscribe/Update your Subscription:
This email sent to email@hidden