jwo.landserf.process.io
Class ImageIO

java.lang.Object
  jwo.landserf.process.io.FileIO
      jwo.landserf.process.io.ImageIO

public class ImageIO

extends FileIO

Contains a collection of static methods for reading and writing image files.

Version:

2.1, 23rd February, 2004.

Author:

Jo Wood

Field Summary

Fields inherited from class jwo.landserf.process.io.FileIO

BIG_ENDIAN, bitsPerValue, byteOrder, errorMessage, filePointer, GATHER_INFO, lineNumber, LITTLE_ENDIAN, LOAD_ALL, LOAD_SELECTED, nullCode, substituteNull, useMultiplier, zMultiplier

Constructor Summary

ImageIO()
There should be no need to call the constructor explicitly since all methods are static.

Method Summary

static RasterMap	readRaster(String fileName, int width, int height) Reads a gif, png or jpeg image and creates a raster from it.
static RasterMap	readTIFF(String fileName, GISFrame gisFrame) Reads a TIFF format image file and creates a raster map from it.
static boolean	writeImage(String fileName, GISFrame gisFrame) Writes out the current graphics area as an image file.

Methods inherited from class jwo.landserf.process.io.FileIO

getErrorMessage, readByte, readByte, readCharacters, readDouble, readDouble, readDoubleBigEndian, readDoubleBigEndian, readDoubleLittleEndian, readDoubleLittleEndian, readFloat, readFloat, readFloatBigEndian, readFloatBigEndian, readFloatLittleEndian, readFloatLittleEndian, readInt, readInt, readIntBigEndian, readIntBigEndian, readIntLittleEndian, readIntLittleEndian, readNextWord, readShort, readShort, readShortBigEndian, readShortBigEndian, readShortLittleEndian, readShortLittleEndian, reset, seek, skip, skip, writeByte, writeCharacters, writeDouble, writeDoubleBigEndian, writeDoubleLittleEndian, writeFloat, writeFloatBigEndian, writeFloatLittleEndian, writeInt, writeIntBigEndian, writeIntLittleEndian, writeLine, writeShort, writeShortBigEndian, writeShortLittleEndian

Methods inherited from class java.lang.Object

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

Constructor Detail

ImageIO

public ImageIO()

There should be no need to call the constructor explicitly since all methods are static.

Method Detail

readRaster

public static RasterMap readRaster(String fileName,
                                   int width,
                                   int height)

Reads a gif, png or jpeg image and creates a raster from it. To read TIFF images, use readTIFF() instead. If a .gfw (GIF), .pgw (PNG) or .jpw (JPEG) file exists with the same file name, the image will be georeferenced using the transformation data contained within it.

Parameters:

fileName - Name of file to read.

width - Width of raster to create or 0 if image width to be used.

height - Height of raster to create or 0 if image height to be used.

Returns:

Raster map repsenting image, or null if problems reading.

readTIFF

public static RasterMap readTIFF(String fileName,
                                 GISFrame gisFrame)

Reads a TIFF format image file and creates a raster map from it.

Parameters:

fileName - Name of file to read.

gisFrame - GUI in which to report progress.

Returns:

Raster map representing contents of TIFF file.

writeImage

public static boolean writeImage(String fileName,
                                 GISFrame gisFrame)

Writes out the current graphics area as an image file. Will also write out a 'world' file (same name but with extension made up of first and last letters of the original extension plus a 'w') containing georeferencing information.

Parameters:

fileName - Name of the image file to create. File format will be based on file name extension (png, gif or jpg/jpeg). Default is png.

gisFrame - GUI holding the graphics area to write as an image.

Returns:

True if image written successfully.