Package de.digitalcollections.openjpeg

Class OpenJpeg

java.lang.Object

de.digitalcollections.openjpeg.OpenJpeg

public class OpenJpeg
extends Object

Field Summary

Fields

Modifier and Type	Field	Description
static ColorModel	COLOR_MODEL_CMYK
static ColorModel	COLOR_MODEL_CMYK_ALPHA
libopenjp2	lib
jnr.ffi.Runtime	runtime

Constructor Summary

Constructors

Constructor	Description
OpenJpeg()	Load the library.

Method Summary

Modifier and Type	Method	Description
BufferedImage	decode(InStreamWrapper wrapper, Rectangle area, int reduceFactor)	Decode the JPEG2000 image in the input stream to a BufferedImage.
BufferedImage	decode(Path filePath, Rectangle area, int reduceFactor)	Decode the JPEG2000 image located at the given path to a BufferedImage.
void	encode(Raster img, OutStreamWrapper output, opj_cparameters params)	Encode a raster image to a JPEG2000 image.
Info	getInfo(InStreamWrapper wrapper)	Obtain information about the JPEG200 image in the input stream.
Info	getInfo(Path filePath)	Obtain information about the JPEG200 image located at the given path.

Methods inherited from class java.lang.Object

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

Field Detail

COLOR_MODEL_CMYK

public static final ColorModel COLOR_MODEL_CMYK

COLOR_MODEL_CMYK_ALPHA

public static final ColorModel COLOR_MODEL_CMYK_ALPHA

lib

public libopenjp2 lib

runtime

public jnr.ffi.Runtime runtime

Constructor Detail

OpenJpeg

public OpenJpeg()

Load the library.

Method Detail

getInfo

public Info getInfo(Path filePath)
             throws IOException

Obtain information about the JPEG200 image located at the given path.

Throws:

IOException

getInfo

public Info getInfo(InStreamWrapper wrapper)
             throws IOException

Obtain information about the JPEG200 image in the input stream.

Throws:

IOException

decode

public BufferedImage decode(InStreamWrapper wrapper,
                            Rectangle area,
                            int reduceFactor)
                     throws IOException

Decode the JPEG2000 image in the input stream to a BufferedImage.

Parameters:

wrapper - Wrapper around the input stream pointing to the image

area - Region of the image to decode

reduceFactor - Scale down the image by a factor of 2^reduceFactor

Returns:

the decoded image

Throws:

IOException - if there's a problem decoding the image

decode

public BufferedImage decode(Path filePath,
                            Rectangle area,
                            int reduceFactor)
                     throws IOException

Decode the JPEG2000 image located at the given path to a BufferedImage.

Parameters:

filePath - Path to the JPEG2000 image file.

area - Region of the image to decode

reduceFactor - Scale down the image by a factor of 2^reduceFactor

Returns:

the decoded image

Throws:

IOException - if there's a problem decoding the image or reading the file

encode

public void encode(Raster img,
                   OutStreamWrapper output,
                   opj_cparameters params)
            throws IOException

Encode a raster image to a JPEG2000 image.

Parameters:

img - image to encode

output - wrapped OutputStream the image should be written to

params - encoding parameters

Throws:

IOException - if encoding fails