I have a problem with DPI inside my book
I have scanned pictures from an old, out of copyright book at 600 DPI
However when making the print-ready file, Lulu tells me that it has detected low resolution images and I should use 300 DPI or more.
I have definitely scanned the images at 600 DPI, as the attachment will show - you can see this by right clicking the properties of the picture and I have not enlarged them on the page
Has anybody got any advice?