Re: Printing Targets
Re: Printing Targets
- Subject: Re: Printing Targets
- From: Eric Chan <email@hidden>
- Date: Sun, 17 Jan 2010 15:20:11 -0500
In general, the idea of selecting the output profile (e.g., Adobe RGB)
to match the document's profile will work to print a target without
color management/transform, that will only work in some applications.
For example, that's the path I suggest when trying to print targets
from Photoshop. However, I don't recommend it when trying to print
targets from Lightroom, because an image that is brought into LR will
still go through LR's image processing engine. Even if you have LR's
Develop sliders set to "not do anything" to your profile target image
(i.e., everything zero'd out), there is the possibility that there
will be some quantization artifacts as a result of forcing an image to
go through the Camera Raw / Lightroom imaging path.
Cheers,
Eric
On Jan 17, 2010, at 3:10 PM, Marco Ugolini wrote:
Robert Rock wrote:
Doyle,
No, my friend does NOT have PS, but I do. And since I'm outputting
the
target TIF's from ProfileMaker for him to print, prior to my
measurements
for profiling, I could certainly take the untagged RGB images into
Photoshop
and assign or convert to any profile.
No, no converting.
Remember, what we aim to do here is not to change anything in the
file. Which means that we just want to *assign* a profile (which
leaves the file's contents as they are), not convert (which changes
the file's contents, that is, its numbers, be they RGB or CMYK).
But as the "visual" appearance of the targets most certainly
changes when
I assign, for example, AdobeRGB, is this not changing the color
values
and hence affecting the ultimate profiling?
No, emphatically and unequivocally no. The *numbers* in the file
remain the same. If you print with no color management (by assigning
the same profile as the one for output), the file's numbers are sent
by the application to the printer without any modifications.
On the other hand, if you converted to another profile, say, by
assigning profile A to the image and then printing to profile B,
then you would definitely be changing the file's numbers, i.e., its
contents. I hope this is clear now.
I thought the process of passing the untagged images through to the
printer AS
IS, was essential to creating accurate profiles?
Yes, and that is exactly why the procedure I'm suggesting is the
correct one -- because it leaves the file's contents as they are,
without changing the numbers which describe each pixel.
If I'm wrong, please explain. And please advise the best procedure
of how I
should assign or convert these images in PS before passing on to my
friend
for printing via Aperture.
Again, do not convert anything. Just *assign* to the image the
profile that you will use in the print dialog box (in this case,
*assigning* is just another name for *embedding*).
In Photoshop, go to Edit > Assign Profile. Click on the "Profile"
radio button, select the desired profile from the menu, then click
the OK button. Done.
Marco Ugolini
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