We've created this Forum Thread with some workarounds and advice to assist you in publishing you ebook.
Black and white images
The black and white images in my prof copy look a little washed out. They look fine in the PDF. I am using Apple Pages for the book layout. Pages allows you to make adjustments to exposure, contrast, highlights and shadow. I was looking for settings for these adjustments to improve the images. I did convert the images to gray scale. A shot of the Pages Adjust Image window is attached below.