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javax.imageio.plugins.jpeg
Class JPEGQTable  

java.lang.Object
  javax.imageio.plugins.jpeg.JPEGQTable

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public class JPEGQTable

extends java.lang.Object

The JPEGQTable class represents a quantization table that can be used to encode or decode a JPEG stream. The standard JPEG luminance and chrominance quantization tables are provided as static fields. Table entries are stored in natural order, not zig-zag order.

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Field Summary
static JPEGQTable	K1Div2Luminance           The standard JPEG luminance quantization table, scaled by one-half.
static JPEGQTable	K1Luminance           The standard JPEG luminance quantization table.
static JPEGQTable	K2Chrominance           The standard JPEG chrominance quantization table.
static JPEGQTable	K2Div2Chrominance           The standard JPEG chrominance quantization table, scaled by one-half.
private  int[]	table           The table entries, stored in natural order.

 

Constructor Summary
	JPEGQTable(int[] table)           Construct a new JPEG quantization table.
private	JPEGQTable(int[] table, boolean copy)           Private constructor that avoids unnecessary copying and argument checking.

 

Method Summary
private static int[]	checkTable(int[] table)
JPEGQTable	getScaledInstance(float scaleFactor, boolean forceBaseline)           Retrieve a copy of this JPEG quantization table with every value scaled by the given scale factor, and clamped from 1 to 255 baseline or from 1 to 32767 otherwise.
int[]	getTable()           Retrieve a copy of the quantization values for this table.
java.lang.String	toString()           Create a string representing this JPEG quantization table.

 

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

 

Field Detail

table

private int[] table

The table entries, stored in natural order.

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K1Luminance

public static final JPEGQTable K1Luminance

The standard JPEG luminance quantization table. Values are stored in natural order.

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K1Div2Luminance

public static final JPEGQTable K1Div2Luminance

The standard JPEG luminance quantization table, scaled by one-half. Values are stored in natural order.

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K2Chrominance

public static final JPEGQTable K2Chrominance

The standard JPEG chrominance quantization table. Values are stored in natural order.

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K2Div2Chrominance

public static final JPEGQTable K2Div2Chrominance

The standard JPEG chrominance quantization table, scaled by one-half. Values are stored in natural order.

Constructor Detail

JPEGQTable

public JPEGQTable(int[] table)

Construct a new JPEG quantization table. A copy is created of the table argument.

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JPEGQTable

private JPEGQTable(int[] table,
                   boolean copy)

Private constructor that avoids unnecessary copying and argument checking.

Method Detail

checkTable

private static int[] checkTable(int[] table)

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getTable

public int[] getTable()

Retrieve a copy of the quantization values for this table.

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getScaledInstance

public JPEGQTable getScaledInstance(float scaleFactor,
                                    boolean forceBaseline)

Retrieve a copy of this JPEG quantization table with every value scaled by the given scale factor, and clamped from 1 to 255 baseline or from 1 to 32767 otherwise.

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toString

public java.lang.String toString()

Create a string representing this JPEG quantization table.

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