Does anyone know what I'm doing wrong?
As per your own words:
printing to PFD from Photoshop
What is it that you are trying to achieve this way that saving the file as a normal "Photoshop PDF" couldn't give you? The image shrinks because you have your DPI and paper settings wrong in the Acrobat dialog, but really, why, why, why even try it that way?
Is there a better way? The reason I'm doing this is to let Photoshop add the crop marks. These forms aren't actually printed by me - I create the PDF & e-mail to whichever group needs them.
Are you saying that instead of print to PDF I should save as a Photoshop PDF? Will that give me the option to add crop marks? Thanks for your help.
you can import the image to illustrator or indesign and save it that way.
heres a work around:
Photoshop certainly does allow bleed. Just set up your canvas to allow for the amount of bleed you want. For example, if you want to print on 8.5x11 with full bleed and you want to allow .25 inc for bleed, set your canvas size to 9x11.5
Then when you are ready to save the file to transfer to the printer you will need to do the following....
1) Obtain a PDF Printer Driver - I use CutePDF Writer
2) Flatten your image (remember to save a copy as another name before you flatten or you will lose all your layers!)
3) Select Print (you will be printing to disk, not to a printer. End result is to create a print ready file on your disc for transfer to your pre-press shop)
4) In settings select OUTPUT. Select "corner cropmarks"
You will also need to set the "Bleed" amount. It should be equal to your artboard size minus your print size.
Finally, and this is important, you will need to change the Page Setup in your printer driver settings to match your artboard size. Choose "Custom Postscript Page" and change the settings from letter (the default) to custom and input your artboard dimensions (example, if your artboard is 9.5x12 enter that)