Q: How do I import my iCloud Photo Stream into Finder so I can edit images in Photoshop?

I'm new to iCloud and my Photo Stream.  On my iPhone 6 I have 60-odd pictures from a vacation that I'd like to put on Facebook _AFTER_ editing them in Photoshop CS4.  Is there a easy way to copy the photo stream pictures to Finder so I can get started?  I don't see this option on my iPhone, and I definitely don't want to import them into iPhoto which is so limited in editing capabilities.

Thanks in advance for any/all help.

Mike