Adobe Photoshop CS4 is probably the most powerful image editing tool on the planet right now. It can do a vast number of things and integrates well with other programs like InDesign (for publishers) or Dreamweaver (for web designers).
Some basic functions that apply for photographers is described in the following.
The program Adobe Bridge, which comes with Photoshop, contains tools to display and organise photos of a wide range of formats, including RAW files from a large number of manufacturers. With Bridge one can also initiate actions in Photoshop like stitching a number of pictures together.
From Bridge, one can open RAW pictures in the program Adobe Camera Raw (ACR) which also comes with Photoshop. In ACR one can adjust RAW files, remove noise, change brightness, convert to black-and-white, fix vignetting and chromatic aberration and a ton of other things - much like one can in Aperture, Lightroom, Capture NX or DPP.
Once the image looks good, one can save it in one of several formats or open it in Photoshop. In Photoshop, one can cut and paste pieces of the different photos and mix them. One can add patterns, text and a lot of other things. The final picture may be resized and saved for use on the internet.
With smartobjects, one even mix layers of different colour spaces and file formats.
If one fully masters Photoshop, there is a good chance that one does not need any other image editing or RAW conversion software at all.
To explore Photoshop further, one can often download a trial version from Adobe.
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