Next decision will be if you just need black ink (usual for text-only books, essays, novels), or maybe full colour printing. One single colour image makes your book a colour one. If you want to add one colour (for example, blue headers…, this will also make a colour POD print, since it has to be produced in a CMYK system.
Note: Some modern POD editors, such as BoD (Books on Demand) will allow you to mix black and white pages with colour ones, so that the final price is not jeopardized by a few illustrations.
And the request to use colour implies the use of white paper, to assure proper colour rendering. This could also reduce the creative possibilities of your book.
If you use only black ink, some editors will offer cream coloured paper, maybe nicer to the eye…
Example: this book includes some colour pictures and screen captures. However, black and white printing was chosen for the paperback version, in order to keep production costs within acceptable limits…
An important point here, you might want to check a printed proof of your book before publishing it.
This can help you in detecting some printing issues. First edition of this book included the notes (as the above ones) in a lighter grey shade. Since the printer process used by CreateSpace has a (relatively) low resolution, you could see the black dots pattern used to create the light grey, which affected the rendering of these texts and greyscale screen captures.
Anyway, you can always have some bad results. You may get a valid proof from one printer company (say, in the US), then get some purchased sample out of a European facility with a different appearance… POD companies cannot assure 100% identical results from different facilities.
Did you like this post? It was adapted from the book "Online Publishing - do it yourself" that you may find on the main online stores...