Although you can fire-up the GIMP to convert an image from one format to another, it's something of a sledgehammer to crack a nut, and time-consuming too. An easier way is to use the Imagemagick software. You'll need to use Synaptic to install it first, however (search for and install the imagemagick package). Once installed, simply use the convert command. The command is intelligent enough to work out what you're trying to do from the filenames you give it. For example, the following will use Imagemagick to convert filename.jpg into a bitmap file:
$ convert filename.jpg filename.bmp
If you're converting an image into a JPEG file, which sacrifices image quality for file size, you might want to add the -quality command switch. Here you can set a value between 0 (poorest quality) to 100 (highest quality); better quality equates to larger filesizes. Most consider settings
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Adobe Photoshop can be a complex tool only because you can do so much with it, however for in this video series, we're going to keep it as simple as possible. In fact, in this video you'll see an overview of the few tools and Adobe Photoshop features we will use. When you see this video, you'll see how you can do so much with so few features, but you'll learn how to use them in depth in the future videos.