[pdftex] Colour profiles and pdftex

[André Bellaïche]

Hello,

I have gone into many troubles with a printing house recently about  
colour profiles or workspaces of included illustrations. The printer  
complained very much about colour profiles for image files embedded in  
the pdf file, although the book was in black, and all the  
illustrations had been converted to black and white or gray level.

These profiles or workspaces have names as Fogra 27 or Dot Gain 15%.

I know nothing about the subject, and could hardly find something  
about it on the Web, or in the books about Illustrator and Photoshop  
you can find in bookshops. So, these are my questions.

1) Where can I find both general and precise information about the  
subject (books or url's)?

2) Is there a default profile included by pdftex in the files it  
produces? What does pdftex do with the profile of included images,  
which can be of various sources: Adobe Illustrator, Photoshop,  
Mathematica, Geoplan... ?

3) Is there a way to change the default output profile of pdftex to  
get more bold printing when one uses the Knuth Computer Modern fonts,  
which prints much to pale in most cases?

André Bellaïche