Why are you printing separations? I never did, except once for testing... Separations should be done in prepress by the rip.
Try to export (ctrl-E) as PDF instead of print.
The logo is what type of graphic and colour mode?
Press setup and than do not "standard" settings for Adobe PDF printer settings, some as "print quality"
We have a program to generate out the pdf automatically, it is using print function instead of export. We can not do the changes on that program so we have to use print. The logo is in pdf format, color mode.
I don't understand the whole problem here:
You have a program, InDesign, which makes PDFs via Export, not via print and with InDesign you should avoid postscript: No EPS, no Distiller, no PDF via print.
When the other program—you don't mention the name, which is it—cannot handle to export PDFs, why do want to do the same in InDesign? When you have 2 cars, 1 uses to much gas, you would never force the other one to use more gas to make the same output as the 1st one? Sorry, describe why you stuck in last millennium technology?
It is the internal program in our company, I don't know how to explain to you. The program can help us to auto import the data into indesign, and then save the indesign file and make PDFs via print.
My problem now is I place some logos (pdf format, color mode) into indesign, and then make PDF via print, the output pdf is strange, the same logo will have different output quality, just like the image in the first discussion. Do you mean we should make PDFs via Export instead of via print? Do you have any other idea to solve it so that we can make correct PDFs via print?
I don't understand why you should create a PDF from InDesign via print in any way? That is an ancient methods, like the old Egyptians have done it when the built pyramids, but we live in modern ages, now we have the technology to export PDFs in much superior quality.
As we need to get the pdf in color separation mode, so that our production team can easy for printing the goods(offset mode). As I know, create pdf via Export will get a pdf in full color version, this is not we wanted. Or could you tell me how to Export a pdf in color separation mode? Is there a function like this?
InDesign is not supposed to be used in a pre separation workflow. It is intended to use it with color management, even with RGB images should be used for print.
I think your workflow sticks in the old ages of pre separation. You should urgently update all your workflows and not try to screw down modern software to premillennial methods.
You've gotten some pretty good analysis here that you and your company should heed!
(1) InDesign is optimized for direct PDF export, not for creating PDF via distillation of PostScript. The PostScript generated by InDesign is optimized for direct printing on PostScript devices and not for PDF creation.
(2) I'll even add that for InDesign content, you get many more options and better reliability by exporting PDF from InDesign (preferably using the PDF/X-4 settings) and then printing from Acrobat (assuming you don't have a printer that directly consumes PDF content).
(3) Pre-separated PDF is not a workflow endorsed by Adobe or any other reliable, recognized standards group or industry trade association. Why, because such a workflow requires pre-flattening all transparency and yields non-repurposeable PDF for starters. No RIPs from the last dozen years or more feature any such workflow. We know of no real benefit of such a workflow since the 1990s.
Thanks for your help and suggestion. Will feedback to my management.
But I suppose the Logo is a kind of picture and not a vector graphic.
As Willi states, your workflow is outdated. But (and there is always a but), if it works (most of the time), why changing it? The answer to this is quite simple: Time. Your workflow makes you loose time.
Current workflows, even since the time of InDesign 3.X, is: Typeset the Document in ID (with the correct colour settings)->Export to PDF, using one of the PDF X 3&4-settings (with preference to PDF X/4) ->Prepress (Imposition & colour separation & rip) ->press.
I generally stop with sending the PDF X/4 file to my printer.
Now even if your workflow is fixed and out of your control, you could do an export with ID, just to see how the problem evolves. In Acrobat (Pro) you can preview the separation plates.
And you could print to the PDF printer and create the separated plates file. This may be helps understanding at which stage the problem appears.
As I know, create pdf via Export will get a pdf in full color version, this is not we wanted.
Not if there's no colour content in the InDesign file. I'm guessing it's not a separated PDF you need, so much as a PDF that only has content on the black plate.
Have you tried actually sending an exported PDF?