prevention of grayscale images converting to CMYK color index

[bchp_tester@adobeforums.com]

Good afternoon,
I am experiencing an issue with using hires grayscale images in Acrobat 6.0 with Enfocus Pitstop pro 6. Pc is running XPpro with 512mb of ram. These are PM 6.5 files (linked image files) being processed into a PDF. The highres grayscale images are being recognized as CMYK or RGB when checked in Acrobat/Pitstop. Is there a feature set that I need to turn on, or some configuration that needs to be adjusted or created? This very same process has no problem with lowres grayscale images of the same PM 6.5 file. The netted .pdf shows no CMYK color indexing of the lowres images. Any help would be greatly appreciated.

Thanks for your time,
-BCHP

[Nathan_Strong@adobeforums.com]

The only color mode Distiller will convert to is RGB, and that's only if you tell it to. Otherwise it will either tag everything for color management (RGB => CalRGB, for example) or simply leave the colors untouched.

- If you open these "hires grayscale images" in Photoshop, does Photoshop indicate it is grayscale?
- What happens if you convert the image itself directly to PDF?

If Pshop shows that it's grayscale and it stays grayscale if you convert your high-res image to PDF, that would indicaate that PageMaker is converting your colors, not Distiller. You might want to ask in the PageMaker forum (although, beware that PageMaker 6.5 isn't supported on Windows XP).

Nathan