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1. Re: Is editing in PS pdf mode OK?
Wade_Zimmerman Jul 29, 2009 9:20 PM (in response to emilycornfield)But why are you sending PDFs? I send image files overseas often and send usually a tiff file or if requested a psd and sometimes jpeg which the open and resave as tiff with out editing then close and reopen as a tiff file.
I have never had a problem, I must have done this over a thousand times by now maybe two thousand.
Both Tiff and psd can be multilayered but have to be flatten for output if intended for press of photographic prints and have to eventually be flatten tiffs.
I am also not certain why you need to send it as layered files?
That is my experience.
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2. Re: Is editing in PS pdf mode OK?
c.pfaffenbichler Jul 30, 2009 1:14 AM (in response to emilycornfield)You might want to check this thread out:
http://forums.adobe.com/message/1894609#1894609
Wade, saving as a pdf (or eps) may be advisable when type is included in the montage.
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3. Re: Is editing in PS pdf mode OK?
Printer_Rick Jul 30, 2009 6:16 AM (in response to emilycornfield)emilycornfield wrote:
I have made a multilayered file in PS CS3 then saved it as a pdf file as it is going overseas to be printed. I then made some changes in those pdf files. Is there any reason I need to go back to the original PS files and also make those changes or are the pdf files OK for these and any future changes? I saved the original pdf's for press high quality, and they are almost exactly the same size (MB)as the PS files. I wonder if the files get denigrated in any way by becoming pdf files and then continued to be worked on (they are still layered pdf files). Thanks for your feedback.
Photoshop PDF is a dual file format. There are two documents wrapped in one file. One document is the native PSD and the other is the PDF output
They can be different, sometimes very different. For example the PDF could be CMYK and downsampled and 8 bit, while the PSD is RGB, higher resolution and 16 bit. It depends on the PDF output settings that are used.
If the PDF portion is edited in another application, and you open the PDF in Photoshop you will be prompted with a message:
"The disk copy of (document) was changed since you last opened or saved. Do you wish to update it?"
The dual file format can be very confusing especially in the case of mixed color modes. A similar situation can be encountered in Illustrator PDFs. I have seen many CMYK PDFs where the native file is RGB.
The advantage to PDF as pointed out is the inclusion of vector information (fonts, paths etc). With PSD the vector information is there but not translated into an output format. Therefore if you import a PSD into another application such as InDesign, then output from ID, the vector data ends up as raster data.
Vector data output from Photoshop is not without problems. The construct is somewhat complex. All text and line art acts as a clipping path around surrounding contone (raster) information. This makes trapping a little more involved, and processing time in RIPs can slow down considerably. For this reason a lot of people don't bother with trying to retain the vector data, and instead just let it all become an image. Depending on the final plate output resolution and line screen used, sometimes a difference is not noticeable.
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4. Re: Is editing in PS pdf mode OK?
Printer_Rick Jul 30, 2009 2:08 PM (in response to Printer_Rick)I should clarify what I stated earlier. If when you initially saved the Photoshop PDF, if you checked "Preserve Editing Capabilities" then you have the dual file format I mentioned.
You can open and edit these PDFs in Photoshop, and the PDF output portion of the file will update accordingly when you save.
Since the native file is part of the PDF, there is no need to make your edits all over again in a separate PSD file.
Be very wary of editing the PDF in another application besides Photoshop, though. That can cause a lot of problems, and more than likely you would get the warning I mentioned earlier.



