Hi there, welcome to the forums:)
I understand you're looking to change the resolution to print photo's to your Photosmart A617. Could you please respond to me and let me know which program and operating system you are using? I will then look into the program settings for you to see if this is an option.
How to tell which Operating System you are running:
Which Windows Operating System am I running?
Mac OS X: How Do I Find Which Mac OS X Version Is on My Computer?
Enjoy your Tuesday:)