Yeah, Photoshop is best for graphics, and you need a pretty good PC to run it, not a beast tho.
1.8GHz or faster processor
Microsoft® Windows® XP with Service Pack 2 (Service Pack 3 recommended) or Windows Vista® Home Premium, Business, Ultimate, or Enterprise with Service Pack 1 (certified for 32-bit Windows XP and 32-bit and 64-bit Windows Vista)
512MB of RAM (1GB recommended)
1GB of available hard-disk space for installation; additional free space required during installation (cannot install on flash-based storage devices)
1,024x768 display (1,280x800 recommended) with 16-bit video card
Some GPU-accelerated features require graphics support for Shader Model 3.0 and OpenGL 2.0