Apple is getting rid of iPhoto and Aperture and releasing a new app, called “Photos”. It integrates with iCloud photos to sync with your iPad, iPhone, and other systems. There is also a ton of editing functionality that is very intuitive. It seems like a big improvement over iPhoto.
Check it out at the link below. Developers are able to access it starting today, with a full release planed in the spring:
RT 
Useful tip about resizing images on a Mac