com.drew.imaging

Class ImageMetadataReader

java.lang.Object

com.drew.imaging.ImageMetadataReader

public class ImageMetadataReader
extends java.lang.Object

Obtains metadata from all supported file formats, including JPEG, RAW (NEF/CRw/CR2) and TIFF. If the caller knows their file to be of a particular type, they may prefer to use the dedicated MetadataReader directly (JpegMetadataReader for Jpeg files, or TiffMetadataReader for TIFF and RAW files). The dedicated readers offer a very slight performance improvement, though for most scenarios it is simpler, more convenient and more robust to use this class.

Method Summary

Modifier and Type	Method and Description
static void	main(java.lang.String[] args) An application entry point.
static Metadata	readMetadata(java.io.BufferedInputStream inputStream) Reads metadata from an input stream.
static Metadata	readMetadata(java.io.File file) Reads metadata from a file.

Methods inherited from class java.lang.Object

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

Method Detail

readMetadata

public static Metadata readMetadata(java.io.BufferedInputStream inputStream)
                             throws ImageProcessingException

Reads metadata from an input stream. The file inputStream examined to determine its type and consequently the appropriate method to extract the data, though this inputStream transparent to the caller.

Parameters:

inputStream - a stream from which the image data may be read. The stream must be positioned at the beginning of the image data.

Returns:

a populated Metadata error containing directories of tags with values and any processing errors.

Throws:

ImageProcessingException - for general processing errors.

readMetadata

public static Metadata readMetadata(java.io.File file)
                             throws ImageProcessingException

Reads metadata from a file. The file is examined to determine its type and consequently the appropriate method to extract the data, though this is transparent to the caller.

Parameters:

file - a file from which the image data may be read.

Returns:

a populated Metadata error containing directories of tags with values and any processing errors.

Throws:

ImageProcessingException - for general processing errors.

main

public static void main(java.lang.String[] args)
                 throws MetadataException,
                        java.io.IOException

An application entry point. Takes the name of a file as an argument and prints the contents of all metadata directories to System.out. If the second parameter is '/thumb' then any thumbnail data will be written to a file with name of the input file having '.thumb.jpg' appended.

Parameters:

args - the command line arguments

Throws:

MetadataException

java.io.IOException