The most suitable file formats for a web site are JPEG and GIF. Using these file formats is not as easy, as it seems. And the usual question is JPEG or GIF – what file format to use?
An important job of the slide designer is to gather information and ideas and arrange them so that they present a well organized message to the viewer. A second and equally important job is to make your presentation interesting or even exciting. Contrast is a wonderful tool for accomplishing this.
One of the most fascinating features about studying Photoshop is that you soon learn that it often provides a variety of different tools and techniques for achieving similar results. Indeed, experimenting with those techniques is often the best way of teaching yourself.
It is fair to say that few, if any, designers can claim to have mastered all of its techniques. Even the Adobe Photoshop help manual and the various third party teach yourself Photoshop books barely scratch the surface.