GIMP stands for GNU Image Manipulation Program, and is a free software program for image authoring and composition, and photo retouching. The program has a scripting interface and can be expanded with plug-ins and extensions.
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To crop means to cut the pieces of an image that you don’t need.
Cropping differs from resizing because when you crop an image you retain the dimensions of the image. Resizing an image actually shrinks the image into smaller dimensions.
An outline font supplies a geometrical description of each character so that the font can be rendered in a variety of sizes. Since they are scalable, outline fonts can make the most of an output device’s resolution. The greater the resolution of the monitor, the sharper the characters will look. Popular languages for defining outline fonts are PostScript and TrueType.
CSS, or cascading stylesheets, allow you to define how web page elements are displayed.
Specific margins or colors can be associated with elements on the web page; Headers and links, for example. When style sheets are applied to a new page, the elements are changed according to the specifications of the style.
Much like an oil painter with her palette of many unique color combinations, each operating system has its own palette. Many computers out there display only 256 colors at a time, and the Macintosh and Windows operating systems reserve about 40 colors out of the 256, leaving 216 available. Netscape Navigator, Microsoft Internet Explorer, and NCSA Mosaic implemented a 216-color palette that won’t dither (i.e., vary the pattern of dots in an image) on different platforms and is “browser safe” (in other words, these 216 colors will always look the same, no matter what platform or browser is being used). Theoretically.