Thomas Knoll created photoshop in 1987 though back then it was called Display. Adobe bought the license to distribute it in 1988.
Adobe Photoshop, or just Photoshop, is a graphics editing program (also known as a DPD, Desktop Publishing Program). It is the market leader for commercial bitmap and image manipulation and is the industry standard for graphics professionals.
Adobe Photoshop CS4 is the 11th major release of Adobe Photoshop. The rebranding CS means Creative Suite which includes multiple Adobe programs for a reduced price. Adobe Photoshop is included in most of Adobe's Creative Suite offerings.
Photoshop CS4 features the ability to paint directly on 3D models, wrap 2D images around 3D shapes, convert gradient maps to 3D objects, add depth to layers and text, get print-quality output with the new ray-tracing rendering engine, and enjoy exporting to supported common 3D formats; the new Adjustment and Mask Panels; Content-aware scaling (also known as seam carving); Fluid Canvas Rotation and File display options. On 30 April, Adobe released Photoshop CS4 Extended, which includes all the same features of Adobe Photoshop CS4 with the addition of capabilities for scientific imaging, 3D, and high end film and video users.
Here are some Photoshop tips for beginners to save you time in photoshop.
1. Create Custom Workspaces for different Projects
eg. when working with text you might want to have the paragragh and character palette open at the same time as some photos. If you 'Save Workspace' and name it.
2. Display The Same Image In Two Windows
Have the image open zoomed in and zoomed out so you don't have to keep zooming when you are editing!
3. The Spacebar activates the Hand Tool temporarily if you click and hold!
4. To undo last edit press Control Z or for multiple undos use Control Alt Z
5. To Hide all your palettes press Tab once then press again to bring them back
6. Tile your images if you have loads open to make them easier to see and access. Choose Arrange then tile.
7. What if you have forgotten the name of the file on your desktop you want to work on? Press control Tab to scroll through all your open documents