While Photoshop CS3 may not have been ideally suited to the photographer, CS4 sees a change in emphasis for Adobe
Adobe Photoshop CS4
Open GL
The previously mentioned improved interface is complemented by enhanced OpenGL functionality.
Your work canvas can now be fluidly rotated, zoomed into and out of, and even thrown around thanks to new ‘toss’ physics, meaning that navigating the image is a breeze.
However, one of the facets of OpenGL is that, of course, your Mac or PC must have an OpenGL graphics card.