http://www.techradar.com/news/best-laptop-for-photoshop

If you're looking for the best laptop for running Photoshop on to edit your photos, there are a number of things you need to consider. The laptop is going to need to have a large, accurate, screen that you can view your photos on. 

It will also need to be powerful enough to run Photoshop, which is a demanding piece of software. Dedicated graphics are worth investing in here, as the graphics card can do a lot of the heavy lifting. You also need to consider how portable you need your laptop to be.