If a POD printer asks you to submit 300dpi grayscale images from which they can make halftones, it does not mean that output is going to be 300dpi, or that the 256 shades of gray you see in each pixel of your computer screen are going to show up in the output. In fact, there are no shades of gray in the interior of a book; gray is simulated with black dots of different sizes. (more…)