Crash Course in Adobe Photoshop CS

Short Description
The primary purpose of Photoshop is to have ultimate control over digital images. This involves the creation and manipulation of digital images on many levels. It is used in almost any industry involving images (such as Advertising, Film Making, Web Design, etc). The possibilities of Photoshop are almost endless and it is the quintessential tool for anyone interested in digital images. There are two main uses of Photoshop: content creation and content manipulation. Content creation is the creation of material from scratch, using Photoshop’s painting tools to make an image. Content manipulation is the modification of existing material.

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Content
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PSD is the formal extension for Photoshop files. These files can be opened by Photoshop, as well as many of Adobe’s other applications. If you are using Photoshop as part of a suite of applications (such as After Effects, Premiere, or Acrobat), you can keep your files in the native PSD format. If you are going to send Photoshop images to a printer or post them on the Internet, you need to save them in a different format such as TIFF (for print and video) or JPEG (for the web).

Resolution
One of the most important issues regarding digital images is resolution. So many people make the mistake of having too low of a resolution that the end product looks blocky or blurry. Resolution can be defined as the number of pixels per inch (ppi, or more commonly dpi for Dots Per Inch) printed on a page. A high-resolution image contains more, and therefore smaller, pixels than an image with a low resolution. The resulting image will be clearer and crisper. Most importantly, you cannot improve a lower quality image by just increasing its resolution, as this simply makes each pixel larger, which results in pixelation (output with large, blocky pixels). Working with video is slightly different in the sense that your output format is fixed. NTSC video uses images that are 720 pixels wide, and 486 pixels tall. High Definition Video uses a 1280×720 resolution.
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