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ByteLookUpTable class help.....

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I am trying to understand code thats already there.
They have used ByteLookUpTable class.

The following is API documentation related to it.
Can anyone help me understand what it does.

public class ByteLookupTable extends LookupTable

This class defines a lookup table object. The output of a lookup operation using an object of this class is interpreted as an unsigned byte quantity. The lookup table contains byte data arrays for one or more bands (or components) of an image, and it contains an offset which will be subtracted from the input values before indexing the arrays. This allows an array smaller than the native data size to be provided for a constrained input. If there is only one array in the lookup table, it will be applied to all bands.

Shyam Ramineni
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