You should be able to save the PDF as grayscale -- I have one saving that way right now.
In the PDF dialog where you choose your color, make sure it says Convert to Destination before you try to choose grayscale.
Only available for these PDF Presets: PDF/X-4, High Quality Print, Press Quality.
Thank you Steve and SRiegel.
There are quite a few options, the dot gains and also :
Generic Grey Gamma 2.2 Profile
Generic Grey Profile
Sorry about the ignorance but what is the difference between them? or how do I choose?
Printer is not giving me much direction
Do sample pages with different choices of the same image and pick the best.
You could place the PDFs side-by-side to see a comparison.
thank you very much. I'll try
This entire file will print in black and white and I have used no colour aside from black and tints of black.
If you want your Black tints to export unchanged to the same gray values, assign the legacy Photoshop 5 Default CMYK to your document (Edit>Assign Profiles... ) and then choose the Dot Gain 20% gray profile as the Destination profile when you export.
Gray profiles will be available as long as Output>Color Conversion is set to Convert to Destination. The legacy Photoshop CMYK profile and the Dot Gain 20% gray profile both use the same 20% dot gain curve, so the CMYK Black values will export unchanged.
I don't know if this is a cc 2017 update, but press quality does not give any gray options that I can see. Only PDF/X-4 worked for me to be able to see dot gains in the list. Thank you, Steve for the tip about trying those!
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but press quality does not give any gray options that I can see.
That's because [Press Quality]'s Output>Color Conversion setting is set to Convert To Destination (Preserve Numbers). If you set it to Convert To Destination the gray profiles will be available.