Questions and Answers

Q I need to view or edit a graphic file in a format that isn't supported by KView or KPaint. How can I do it?

A You'll need to convert the format of the image. This can be done using a variety of other graphics programs or utilities. Depending on the format that your file is in, you can try GIMP (enter gimp), Ghostscript (enter gs to start it, but see the man page for details), the Image Magik package, or the netpbm package (both available from popular Linux archive FTP sites such as ftp.caldera.com).

Q What is a color palette?

A A palette is a set of colors. Each image file will have a palette; the more colors in the image, the larger the palette. The maximum size of an image's palette is defined by the number of bits used to store each picture element (pixel) of the image. More bits means more colors are possible. Similarly, reducing the color palette of an image can reduce the amount of space needed to store it (this is a common operation for images destined for the Web). In drawing programs, one or more default palettes are provided so you can choose which colors to include in your image. In most KDE programs you can use the Select Color dialog box to select from or add to the palette of available colors.

Q I see some graphics formats that I've never heard of, such as xpm and ppm. What are they?

A Because UNIX and Linux systems might be used for a variety of graphics and image processing tasks, you'll find that Linux graphics programs often include support for a diverse set of formats, such as Macintosh, Windows, SGI, Sun, and professional printing or design (CAD) formats. Several additional formats (such as xpm) are used by the X Window System for icons or internal storage of images.

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