One of the issues that publishers run into is that when they create their books, for either print or digital, using Word (for PC—Word for Mac does not have this glitch), it automatically down-rezzes (reduces the resolution) of any images in the file, upon "Save." If you're going to have images in your book, make sure that you download our handy ClickByClick™ Guide, which will show you how to prevent that from happening.
Why Do I Care About Images With Reduced Resolution?
If you're doing a print book, this is actually a much bigger issue than if you're creating an eBook, but it matters in both environs. Many POD (Print on Demand) companies will not accept a book for printing that has images below 300DPI; some have a lower limit of 200DPI. Either way, you definitely do not want 96DPI or 72DPI images in your Word file, especially if you've gone to the trouble of sourcing your images carefully, paying attention to pesky details like "resolution"! Get your ClickByClick™ Guide, below:
Our ClickByClick Guide on How to Keep Word from Compressing Your Images