JPEGQTable JDK 1.6)

Description

public class JPEGQTable

A class encapsulating a single JPEG quantization table.

See also:

Constructors

private JPEGQTable ()

Constructs an empty quantization table.

public JPEGQTable (int[] table)

Constructs a quantization table from the argument, which must contain 64 elements in natural order (not zig-zag order).

Constructs a quantization table from the argument, which must
contain 64 elements in natural order (not zig-zag order).
A copy is made of the the input array.
Parameters:
- table - the quantization table, as an int array.
Throws:
- IllegalArgumentException - if table is null or table.length is not equal to 64.

Methods

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public JPEGQTable getScaledInstance (float scaleFactor, boolean forceBaseline)

Returns a new quantization table where the values are multiplied by scaleFactor and then clamped to the range 1..32767 (or to 1..255 if forceBaseline is true).

Values of scaleFactorless than 1 tend to improve the quality level of the table, and values greater than 1.0 degrade the quality level of the table.
Returns: a new quantization table that is a linear multiple of the current table.
Parameters:
- scaleFactor - the multiplicative factor for the table.
- forceBaseline - if true, the values will be clamped to the range 1..255.

public int getTable ()

Returns a copy of the current quantization table as an array of ints in natural (not zig-zag) order.

public String toString ()

Fields

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publicfinalstatic JPEGQTable K1Div2Luminance

The sample luminance quantization table given in the JPEG specification, table K.1, with all elements divided by 2.

publicfinalstatic JPEGQTable K1Luminance

The sample luminance quantization table given in the JPEG specification, table K.1.

publicfinalstatic JPEGQTable K2Chrominance

The sample chrominance quantization table given in the JPEG specification, table K.2.

publicfinalstatic JPEGQTable K2Div2Chrominance

The sample chrominance quantization table given in the JPEG specification, table K.2, with all elements divided by 2.