InDesign / Acrobat photo dpi issues?

Question

I inserted several pictures into an InDesign book file. All of the pictures were edited in Photoshop and were originally 300 dpi. When I saved them as .jpgs, I chose to save them at the absolute best quality possible. Then I saved the file through the Distiller as a PDF.

My printer came back and said all my pictures were between 149-229 dpi. How is this possible.

Answer 1

jpg is a lossy format .. which means even at highest quality, you are still going to lose information each time you save the file.

For print documents, save in a non-lossy format, such as bmp, tif, or png.