"Johan W. Elzenga" wrote in message
Flycaster wrote:
I told him more or less exactly the same thing in the other PS
newsgroup,
except for this setting. FWIW, I’ve printed using Source Space of
Document,
and Proof with [seemingly] identical results. The only thing that seems
to
be crucial is that you designate the actual profile in Print Space.
Use your common sense. The document space is the space of the document. The space you want to use is a different one, namely the printer space. So for printing, a conversion from document space to printer space has to be done. "Proof" shows you that conversion, so "proof space" shows your document WHEN CONVERTED to printer space.
How can you use this during printing?
If you use the printer profile as the printer space, you can use the ‘document’ or ‘proof’ as the source. It doesn’t matter, because in both cases the correct conversion will take place.
If you use "Same as source" as print space, you MUST use "Proof" as source (because the proof space is identical to the printer space, the source space is not). If you would use ‘document’, NO conversion would take place and the print would be off color.
An alternative method is to convert the document to the print profile (using the "convert to profile" menu). Then you can simply use "source space" as printer space, because the source space is now identical to the print space. In this case you don’t need soft proofing at all, because you are already looking at your document in printer space.
John, I just got off the phone with my service bureau owner, who has had conversations with Adobe and Bruce Fraser on this issue. As suggested [but not clarified] in RWP, it would appear that we are all operating under a misunderstanding. FWIW, both Bill Hilton and I have been using profiles for quite a long time and this is NOT necessarily "common sense." What we’re dealing with here is a, relatively speaking, undocumented setting.
Apparently, "Source Space=Proof" is to be used when you want to hard-proof a device that is *different* from your printing device. For example, say you want to hard-proof a US sheetfed CMYK file on an Epson 7600: you set up the soft proof with the CMYK profile, set Source:Proof, and use the correct profile *for your printer* in the Print Space. You will end up with a hard proof of the final CMYK output, as best your printer, profile, and Photoshop CMS can manage. As explained to me, Source:Proof uses the on-the-fly profile conversion rendered in the soft-proof to describe the file *before* it is converted, if at all, to the printer profile.
Now, here’s where it gets muddy. If you soft-proof with your Epson 7600 profile, use "Source:Proof" and "Print Space: the same profile", you have, in essence, "double-converted" the file, albeit from the "same" space to the "same" space. The problem is, according to my contact, the soft-proof on-the-fly rendering is not completely accurate, so with rounding errors and slight inaccuracies, you *will* end up with a conversion that has different file information than if you had simply converted from "Document." Likewise, similar "inaccuracy" errors will occur if you use "Source:Proof" and "Print Space: Same as Source." As I mentioned to Bill, however, I saw no glaring differences, but I will now run another test an pay closer attention.
So, if what I have been told is correct, the two workflows for day-in, day-out inkjet printing are either "Source Space:Document, Print Space: Profile" or "Convert to Profile, Source Space:Document, Print Space:Same as Source." Last, you STILL want to use the soft-proof even when you run a pre-printing "convert to profile" because you cannot approximate "paper-white" in the "convert to profile" preview screen. IOW, even though the final output is identical, the screen rendition and match is much more accurate in the soft-proof window.
If either of you find out anything different, please let me know. I wish that I could find the e-mail I got from Bruce about 3 years ago on this subject, but it’s gone into the ether somewhere. IIRC, however, he did say that Jon Cone’s workflow was problematic, but that in many cases the visible differences would be insignificant. Regardless, I do remember him suggesting the use of Document for the optimum results.
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