6.2 Density Slicing/Color Density Slicing and Pseudo Coloring

Density Slicing is to represent a group of contiguous digital numbers using a single value. Although some details of the image will be lost, the effect of noise can also be reduced by using density slicing. As a result of density slicing, an image may be segmented, or sometimes contored, into sections of similar grey level. Each of these segments is represented by a user specified brightness.

Similarly, we can represent a section of grey levels using different colors, or pseudocoloring. This has been used in coloring classification maps in most image analysis software systems. For example, five classes can be represented by red, green, blue, yellow, and grey. This can be realized by assigning red, green, and blue color guns with the following values:

Class No	Red Gun	Green Gun	Blue Gun	Color
1	255
2	0
3	0
4	255
5	100