Eruheran,
The problem with CMYK is that some colors you can create on the computer screen CANNOT be printed. Very strange that!
The problem area is usually in the bright blue range. When you print, it comes out purple. This happened to me. I had this fabulous 3D meteorite on my book cover ... glowing blue ... really cool ... and then it printed in purple and ended up looking like a HUGE RAISIN !!! Yikes !!!
Anyway, that is the danger you can run into. If you have the "REAL" photoshop, and not the "elements" version, then you should have all the tools you need ... but you'll probably have to learn some CMYK features of the software you haven't learned yet. For instance:
I would bet that there is a CMYK "mode" that will display your colors as they will be printed ... it will turn those bright blues to purple so you can see your goofs.
Also, you should be selecting colors using PANTONE, and I am quite sure that Photoshop will allow this.
Another thing you need to worry about is what is called Total Ink Coverage ... when you print a book cover you must not go above 240% ink on the page, or the ink gets too thick and won't dry properly, so the printer won't even attempt it.
Here is a link:
http://www.newselfpublishing.com/TotalInkLimit.html Think of it this way ... you have four inks [C]yan, [M]agenta, [Y]ellow, and Blac[K]. Theoretically you could cover a page 100% with all four inks, making the page covered at 400%. How do you know if your graphic goes beyond the 240% limit? Photoshop can tell you !! (I'm not sure where the feature is hidden, you will have to research that.)
Also, the reason the PANTONE colors are important is that there are different kinds of the "same" color ... for instance you could attempt to make a black area black with only the [K] at 100%, and you'd think that would work, but it will actually come out somewhat gray-ish. PANTONE has black definitions for other "blacks" that include other inks to make it richer.
Anyway, thanks so much for pointing out Photoshop ... I really should have included that with InDesign as necessary for self-publishing books professionally.
And "YES" ... it can be done without these expensive tools. You could typeset it just in Microsoft Word, and you could create your graphics in other software (such as Xara), but in that case you should definitely order proof copies and expect more difficulties.
-Robert
