RE: Printing Targets
RE: Printing Targets
- Subject: RE: Printing Targets
- From: Marco Ugolini <email@hidden>
- Date: Sun, 17 Jan 2010 15:10:42 -0500 (EST)
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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