Hello Bobye, welcome to the HP Forums.
I understand that you are having issues with printing photo's from your Photosmart C310a. When you print, they appear darker than they are on your monitor. I think I have identified a document that may help.
Please try following this document for “Fixing Ink Streaks, Faded Prints, and Other Common Print Quality Problems”.
Let me know if this was helpful
Thanks for you post.