PngChunkType (metadata-extractor - Javadoc - Extracts Exif, IPTC, XMP, ICC and other metadata from image files)

java.lang.Object
- com.drew.imaging.png.PngChunkType

public class PngChunkType
extends Object

Author:: Drew Noakes https://drewnoakes.com

Field Summary

Fields
Modifier and Type	Field and Description
`static PngChunkType`	`bKGD`
`static PngChunkType`	`cHRM`
`static PngChunkType`	`gAMA`
`static PngChunkType`	`hIST`
`static PngChunkType`	`iCCP`
`static PngChunkType`	`IDAT`
`static PngChunkType`	`IEND`
`static PngChunkType`	`IHDR` Denotes a critical `PngChunk` that contains basic information about the PNG image.
`static PngChunkType`	`iTXt`
`static PngChunkType`	`pHYs`
`static PngChunkType`	`PLTE` Denotes a critical `PngChunk` that contains palette entries.
`static PngChunkType`	`sBIT`
`static PngChunkType`	`sPLT`
`static PngChunkType`	`sRGB`
`static PngChunkType`	`tEXt` Denotes an ancillary `PngChunk` that contains textual data, having first a keyword and then a value.
`static PngChunkType`	`tIME`
`static PngChunkType`	`tRNS`
`static PngChunkType`	`zTXt`

Constructor Summary

Constructors
Constructor and Description

PngChunkType(byte[] bytes)

PngChunkType(String identifier)

PngChunkType(String identifier, boolean multipleAllowed)

Constructors
Constructor and Description
`PngChunkType(byte[] bytes)`
`PngChunkType(String identifier)`
`PngChunkType(String identifier, boolean multipleAllowed)`

Method Summary

Methods
Modifier and Type	Method and Description
`boolean`	`areMultipleAllowed()`
`boolean`	`equals(Object o)`
`String`	`getIdentifier()`
`int`	`hashCode()`
`boolean`	`isAncillary()`
`boolean`	`isCritical()`
`boolean`	`isPrivate()`
`boolean`	`isSafeToCopy()`
`String`	`toString()`

Methods inherited from class java.lang.Object
getClass, notify, notifyAll, wait, wait, wait

- Field Detail
  - IHDR
```
public static final PngChunkType IHDR
```
    Denotes a critical PngChunk that contains basic information about the PNG image. This must be the first chunk in the data sequence, and may only occur once.
    The format is:
    - pixel width 4 bytes, unsigned and greater than zero
    - pixel height 4 bytes, unsigned and greater than zero
    - bit depth 1 byte, number of bits per sample or per palette index (not per pixel)
    - color type 1 byte, maps to PngColorType enum
    - compression method 1 byte, currently only a value of zero (deflate/inflate) is in the standard
    - filter method 1 byte, currently only a value of zero (adaptive filtering with five basic filter types) is in the standard
    - interlace method 1 byte, indicates the transmission order of image data, currently only 0 (no interlace) and 1 (Adam7 interlace) are in the standard
  - PLTE
```
public static final PngChunkType PLTE
```
    Denotes a critical PngChunk that contains palette entries. This chunk should only appear for a PngColorType of IndexedColor, and may only occur once in the PNG data sequence.
    The chunk contains between one and 256 entries, each of three bytes:
    - red 1 byte
    - green 1 byte
    - blue 1 byte
    The number of entries is determined by the chunk length. A chunk length indivisible by three is an error.
  - IDAT
```
public static final PngChunkType IDAT
```
  - IEND
```
public static final PngChunkType IEND
```
  - cHRM
```
public static final PngChunkType cHRM
```
  - gAMA
```
public static final PngChunkType gAMA
```
  - iCCP
```
public static final PngChunkType iCCP
```
  - sBIT
```
public static final PngChunkType sBIT
```
  - sRGB
```
public static final PngChunkType sRGB
```
  - bKGD
```
public static final PngChunkType bKGD
```
  - hIST
```
public static final PngChunkType hIST
```
  - tRNS
```
public static final PngChunkType tRNS
```
  - pHYs
```
public static final PngChunkType pHYs
```
  - sPLT
```
public static final PngChunkType sPLT
```
  - tIME
```
public static final PngChunkType tIME
```
  - iTXt
```
public static final PngChunkType iTXt
```
  - tEXt
```
public static final PngChunkType tEXt
```
    Denotes an ancillary PngChunk that contains textual data, having first a keyword and then a value. If multiple text data keywords are needed, then multiple chunks are included in the PNG data stream.
    The format is:
    - keyword 1-79 bytes
    - null separator 1 byte (\0)
    - text string 0 or more bytes
    Text is interpreted according to the Latin-1 character set [ISO-8859-1]. Newlines should be represented by a single linefeed character (0x9).
  - zTXt
```
public static final PngChunkType zTXt
```
- Constructor Detail
  - PngChunkType
```
public PngChunkType(String identifier)
             throws PngProcessingException
```
    Throws:
    
    PngProcessingException
  - PngChunkType
```
public PngChunkType(String identifier,
            boolean multipleAllowed)
             throws PngProcessingException
```
    Throws:
    
    PngProcessingException
  - PngChunkType
```
public PngChunkType(byte[] bytes)
             throws PngProcessingException
```
    Throws:
    
    PngProcessingException
- Method Detail
  - isCritical
```
public boolean isCritical()
```
  - isAncillary
```
public boolean isAncillary()
```
  - isPrivate
```
public boolean isPrivate()
```
  - isSafeToCopy
```
public boolean isSafeToCopy()
```
  - areMultipleAllowed
```
public boolean areMultipleAllowed()
```
  - getIdentifier
```
public String getIdentifier()
```
  - toString
```
public String toString()
```
    Overrides:
    
    toString in class Object
  - equals
```
public boolean equals(Object o)
```
    Overrides:
    
    equals in class Object
  - hashCode
```
public int hashCode()
```
    Overrides:
    
    hashCode in class Object

Class PngChunkType

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

IHDR

PLTE

IDAT

IEND

cHRM

gAMA

iCCP

sBIT

sRGB

bKGD

hIST

tRNS

pHYs

sPLT

tIME

iTXt

tEXt

zTXt

Constructor Detail

PngChunkType

PngChunkType

PngChunkType

Method Detail

isCritical

isAncillary

isPrivate

isSafeToCopy

areMultipleAllowed

getIdentifier

toString

equals

hashCode