There are lots of laptops out there which are perfectly capable of running PhotoShop and similar software speedily and with good colour fidelity. BUT, I can't imagine trying to actually use PhotoShop with a touch pad. Maybe I'm just too wedded to my trackball but I would think vary carefully about the ergonomics of heavy duty photo-editing on a laptop unless you are also prepared to carry around your pointing weapon or Wacom tablet of choice.
Having mentioned tablets that begs the question of whether there are any tablet computers out there which employ a pressure sensitive stylus? I don't know if there are but if so then maybe, just maybe, such a machine would be worth considering if the underlying hardware (CPU/GPU, memory, storage etc) were up to snuff. Thoughts or suggestions?
A quick Google turned up the Lenovo X220t. It's reviewed here
at Trusted Reviews who note that "the thin pen is quite comfortable, and is coated in the same soft finish as the lid and inner screen bezel. It will recognise 512 pressure levels, which might not seem like much compared to the 2,048 levels of a Wacom Intuos 4 graphics tablet but is adequate for sketching and light drawing
". Personally I'd consider upgrading it to Core i7, 8GB of memory and, possibly, a larger HDD, all fairly reasonably priced upgrade options if you buy direct from Lenovo and customise.
Image courtesy of Trusted Reviews