Package com.mcgath.jhove.module.png

Class TrnsChunk

java.lang.Object

com.mcgath.jhove.module.png.PNGChunk

com.mcgath.jhove.module.png.TrnsChunk

public class TrnsChunk
extends PNGChunk

The Transparency chunk. The interpretation of the Transparency chunk depends on the color type. For color type 0 (greyscale) there is one two-byte integer, representing the gray sample value. For color type 2 (RGB) there are three two-byte integers, representing the red, blue, and green sample values respectively. For color type 3 (palette), the values are bytes giving the alpha value for the palette index. The number of values may be less than or equal to the length of the palette.

Field Summary

Fields inherited from class com.mcgath.jhove.module.png.PNGChunk

_dstream, _module, _nisoMetadata, _propList, ancillary, bKGD_HEAD_SIG, cHRM_HEAD_SIG, chunkData, chunkType, crc, duplicateAllowed, gAMA_HEAD_SIG, hIST_HEAD_SIG, iCCP_HEAD_SIG, IDAT_HEAD_SIG, IEND_HEAD_SIG, IHDR_HEAD_SIG, iTXt_HEAD_SIG, length, pHYs_HEAD_SIG, PLTE_HEAD_SIG, sBIT_HEAD_SIG, sPLT_HEAD_SIG, sRGB_HEAD_SIG, tEXt_HEAD_SIG, tIME_HEAD_SIG, tRNS_HEAD_SIG, zTXt_HEAD_SIG

Constructor Summary

Constructors

Constructor	Description
TrnsChunk(int sig, long leng)	Constructor

Method Summary

Modifier and Type	Method	Description
void	processChunk(RepInfo info)	Process the data in the chunk.

Methods inherited from class com.mcgath.jhove.module.png.PNGChunk

chunkTypeString, getChunkData, getChunkType, getCRC, getLength, makePNGChunk, processChunkCommon, readCRC, readUnsignedByte, readUnsignedInt, readUnsignedShort, setInputStream, setModule, setNisoMetadata, setPropertyList, skipBytes

Methods inherited from class java.lang.Object

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

Constructor Details

TrnsChunk

public TrnsChunk(int sig,
 long leng)

Constructor

Method Details

processChunk

public void processChunk(RepInfo info)
                  throws Exception

Process the data in the chunk.

Overrides:

processChunk in class PNGChunk

Throws:

Exception