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Open the PDF file in Acrobat Pro. There are Convert Color and Preflight capabilities in there to convert from R=G=B grayscale to CMYK=(0,0,0,k). Then place the resultant PDF in InDesign.
@Dov - Thanks
1. I would prefer to be able to do it in InDesign - but if it can't be done there, then this is fine
2. What would happen if there are some gray letters in the file? Is this conversion ok for that?
See #10 & 11 in this thread
If the black RGB text is 0|0|0 it will convert to 100% K with any gray profile set as the PDF export destination. If there are 0|0|0|100 black objects in the document you have to watch out for conversions to less than 100% black. #11 in above thread will prevent that or you can set your Appearance of Black preference to Rich Black.
I just exported using Dot gain 20% - but the output of grays were much darker than it was without conversion
However, when I used 30%, it came out almost exact! except one thing - all shadows that I had in the document moved slightly (or maybe enlarged slightly)
Does this make sense? Why is this?
but the output of grays were much darker than it was without conversion
What color mode are the grays that are changing? Are they also RGB inside of the placed PDF or are they black tints made in InDesign? What is the color mode and values of the (drop?) shadow color? And did you use the PDF/X-4 preset with the destination set to Dot Gain 20%?
@Rob, thanks for replying
Those are great questions!
- I have 2 types of grays, some are black with tinting which I did in InDesign, others are RGB which came from the original PDF - They both get darker with conversion to 20%
- Outer glow is black (InDesign black) with 60% opacity
- No, for "Standard" I chose "none", and for "Compatibility" I chose "Acrobat 4"
Please let me know what you think of this
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Use the PDF/X-4 preset with the destination set to a gray profile like this:
The change in the shadow probably comes from flattening the PDF (your Acrobat 4 compatability). The X-4 preset includes an output intent so the preview or soft proof simulation will be via the gray profile you choose.
Also you can use you document's CMYK profile's Black Ink profile as the destination profile. Like this where I'm using the default US SWOP Black Ink:
See Peter's #7 here for instructions on generating a black ink gray profile:
@Rob, thanks for the great detailed answers Rob!
Regarding the gray profile with PDF/x-4, I tried that but it was the same
However, I'm not sure if it really moved!
On screen, it for sure looked like that when changing from one pdf to the next
But when I zoomed in and switched back and forth, I didnt see a move
Anyway, in printout, there was no noticeable change