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java.lang.Objectjavax.imageio.plugins.jpeg.JPEGQTable
public class JPEGQTable
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.
Field Summary | |
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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. |
Constructor Summary | |
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JPEGQTable(int[] table)
Construct a new JPEG quantization table. |
Method Summary | |
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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. |
String |
toString()
Create a string representing this JPEG quantization table. |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
Field Detail |
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public static final JPEGQTable K1Luminance
public static final JPEGQTable K1Div2Luminance
public static final JPEGQTable K2Chrominance
public static final JPEGQTable K2Div2Chrominance
Constructor Detail |
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public JPEGQTable(int[] table)
table
- the 64-element value table, stored in natural order
IllegalArgumentException
- if the table is null or if
table's length is not equal to 64.Method Detail |
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public int[] getTable()
public JPEGQTable getScaledInstance(float scaleFactor, boolean forceBaseline)
scaleFactor
- the factor by which to scale this tableforceBaseline
- clamp scaled values to a maximum of 255 if
true, 32767 if false
public String toString()
toString
in class Object
Object.getClass()
,
Object.hashCode()
,
Class.getName()
,
Integer.toHexString(int)
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