🚀 go-pugleaf

InDesign CS2 and CS3 don't recognize Grayscale
profiles. This was already mentioned in my doc.
It seems to be still the same for CS4.
Therefore Grayscale is labeled as Device Gray,
which means, it's unspecified. If the conversion
was done with an appropriate DotGain or an
appropriate profile like Black Ink ISOCoated, then
it's OK. It's not corrrect if Gamma=2.2 was chosen
because this is wrong for coated media.
[Black Ink ISOCoated is derived as a custom grayscale
 profile by loading ISOCoated.]
Grayscale can be avoided by copying the gray image
into the K-channel of a CMYK file with empty plates
CMY. This is definitely a CMYK image.

I don't know what this means:
Black CMYK "ICC"
If it's based on an ICC profile, then the profile should
be mentioned. A new version of 'Black Ink ...' as above ?

Indexed Color means that a graphic needs only 8 bits
per pixel or one channel. It can happen that CMYK = 000K
is converted to Indexed.
This is indeed confusing. Export to PDF can be prevented
from applying this conversion:

Search your folder for PDF joboptions:
C:\Adobe CS2\Adobe Acrobat 7.0\Distillr\Settings

Choose your actual file:
filename.joboptions

And replace here
/ConvertImagesToIndexed true
'true' by 'false'

Spot inks are not indicated by Indexed but like this:
Separation Color Space Pantone 100C

In any case of doubt I'm doing some tests with small
files which contain typical ingredients.

Best regards --Gernot Hoffmann