Photoshop conversion from TIFF to PDF with ultralarge images

[Ignacio28085554rudj]

Hi,

I am generating a CMYK image with 2 additional alpha channels (spot colors). It is large, 34000x15000 pixels.

The image can be saved correctly in TIFF format, but when I try to save it as PDF, the accesible formats are reduced to six or seven options, not showing PDF.
If I modify its width to 30000, then all the format options appear again in the "Save as type:", PDF included.

Does anybody know of this limitation, what the exact limit is and a workaround to generate large PDF files with spot colors?

Thanks,

    Ignacio

[rob day]

This is a 39,000 pixel, CMYK TIFF with a Spot channel, exported as PDF/X-4 from InDesign.

The CMYK+Spot color is DeviceN with the InDesign CMYK profile included as the Output Intent profile (the TIFF CMYK & Spot values get exported unchanged). The document creation and PDF export could be scripted.

[Ignacio28085554rudj]

Rob,
that´s a nice surprise! If I understand it correctly, your suggestion is to generate the PDF from InDesign, isn´t it?
Let me attach a 33000x1100 pixels CMYK TIFF image with 2 additional channels (orange and violet, ignore their alternate colors).
Would you mind confirming that InDesign can generate the PDF correctly?
I would appreciate it very much, for I´m pretty sure Photoshop has 30000 as a hard limit for its width.
Thanks,
   Ignacio

[rob day]

The Export from ID is 6 plates, DeviceN Color Space. I used the default PDF/X-4 preset with Compression turned off. See attached

[Ignacio28085554rudj]

It works!

Wonderful, you made my day! Thanks a million,

   Ignacio