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java.lang.Objectjavax.imageio.plugins.jpeg.JPEGQTable
public class JPEGQTable
A class encapsulating a single JPEG quantization table. The elements appear in natural order (as opposed to zig-zag order). Static variables are provided for the "standard" tables taken from Annex K of the JPEG spec, as well as the default tables conventionally used for visually lossless encoding.
For more information about the operation of the built-in JPEG plug-ins, see the JPEG metadata format specification and usage notes.
| Field Summary | |
|---|---|
static JPEGQTable |
K1Div2Luminance
The sample luminance quantization table given in the JPEG specification, table K.1, with all elements divided by 2. |
static JPEGQTable |
K1Luminance
The sample luminance quantization table given in the JPEG specification, table K.1. |
static JPEGQTable |
K2Chrominance
The sample chrominance quantization table given in the JPEG specification, table K.2. |
static JPEGQTable |
K2Div2Chrominance
The sample chrominance quantization table given in the JPEG specification, table K.2, with all elements divided by 2. |
| Constructor Summary | |
|---|---|
JPEGQTable(int[] table)
Constructs a quantization table from the argument, which must contain 64 elements in natural order (not zig-zag order). |
|
| Method Summary | |
|---|---|
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). |
int[] |
getTable()
Returns a copy of the current quantization table as an array of ints in natural (not zig-zag) order. |
String |
toString()
Returns a string representation of the object. |
| Methods inherited from class java.lang.Object |
|---|
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
| Field Detail |
|---|
public static final JPEGQTable K1Luminance
K1Div2Luminancepublic static final JPEGQTable K1Div2Luminance
K1Luminancepublic static final JPEGQTable K2Chrominance
K2Div2Chrominancepublic static final JPEGQTable K2Div2Chrominance
K2Chrominance| Constructor Detail |
|---|
public JPEGQTable(int[] table)
table - the quantization table, as an int
array.
IllegalArgumentException - if table is
null or table.length is not equal to
64.| Method Detail |
|---|
public int[] getTable()
public JPEGQTable getScaledInstance(float scaleFactor,
boolean forceBaseline)
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.
scaleFactor - the multiplicative factor for the table.forceBaseline - if true, the values will be
clamped to the range 1..255.
public String toString()
ObjecttoString method returns a string that
"textually represents" this object. The result should
be a concise but informative representation that is easy for a
person to read.
It is recommended that all subclasses override this method.
The toString method for class Object
returns a string consisting of the name of the class of which the
object is an instance, the at-sign character `@', and
the unsigned hexadecimal representation of the hash code of the
object. In other words, this method returns a string equal to the
value of:
getClass().getName() + '@' + Integer.toHexString(hashCode())
toString in class Object
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