Data other than raster imagery is often referred to as segment data or as auxiliary segments, and relates to the structure of the PCIDSK file. Segments can be similar to layers or channels.

Unlike raster channels, auxiliary segments are not required to be sequentially numbered. For example, in the irvine.pix file, there are two PCT segments, numbered 7 and 8. In PCIDSK files, the segment number for a particular segment is unique among all other segments in that file. This is not generally true for other formats; for example, a bitonal TIFF file can have a PCT segment with the number 1 and a bitmap segment number 1.

Each segment type has a three-letter code that is often included in reports and utility programs to show the type.

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