ImageUtils Class Reference

List of all members.

Static Public Member Functions
static BufferedImage	createWritableBuffer (int width, int height)
static long	getTimeFromString (String timestampString)
	Parses strings like 2005:03:30 19:20:23 and returns a java.sql.Timestamp object.
static boolean	isJPEGFile (File imageFile)
static String	readCaptureDateFromEXIF (File photoFile)
	Gets the EXIF timestamp from a photo.
static BufferedImage	readImage (File source)
static Dimension	readSize (File imageFile)
	This works for both JPEG and non JPEG images/photos.
static Dimension	readSizeByLoading (File imageFile)
	Load in the image file just to read the photo size.
static long	readTimeFrom (File photo)
	If the EXIF field does not exist, it will return a time representing the file last modified date/time.
static BufferedImage	scaleImage (BufferedImage src, float sX, float sY)
	Scaled a buffered image by the two scale parameters.
static BufferedImage	scaleImageToFit (BufferedImage src, int width, int height)
static BufferedImage	scaleImageToSize (BufferedImage src, int targetWidth, int targetHeight, boolean maintainAspectRatio)
static void	writeImageToJPEG (BufferedImage bufferedImage, File file)
static void	writeImageToJPEG (BufferedImage buffImage, int quality, File outputFile)
	This method is generally BETTER than ImageIO.write(.
static void	writeImageToPNG (RenderedImage rImage, File outputFile)

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Detailed Description

This software is distributed under the BSD License.

Author:

Ron B Yeh (ronyeh(AT)cs.stanford.edu)

Definition at line 37 of file ImageUtils.java.

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Member Function Documentation

static BufferedImage createWritableBuffer	(	int	width,
		int	height
	)			[static]

Parameters:

	width
	height

Returns:

Definition at line 44 of file ImageUtils.java.

static long getTimeFromString

(

String

timestampString

)

[static]

Parses strings like 2005:03:30 19:20:23 and returns a java.sql.Timestamp object.

Parameters:

timestampString

Returns:

Definition at line 54 of file ImageUtils.java.

Referenced by ImageUtils.readTimeFrom().

static boolean isJPEGFile

(

File

imageFile

)

[static]

Returns:

whether or not a file is a JPEG (just based on file extensions of .jpeg or .jpg) =]

Definition at line 81 of file ImageUtils.java.

Referenced by ImageUtils.readSize().

static String readCaptureDateFromEXIF

(

File

photoFile

)

[static]

Gets the EXIF timestamp from a photo.

Parameters:

photoFile

Returns:

Definition at line 96 of file ImageUtils.java.

Referenced by ImageUtils.readTimeFrom().

static BufferedImage readImage

(

File

source

)

[static]

Parameters:

source

Returns:

Definition at line 126 of file ImageUtils.java.

static Dimension readSize

(

File

imageFile

)

[static]

This works for both JPEG and non JPEG images/photos.

It defaults to a generic method if it cannot find the jpeg EXIF.

Parameters:

imageFile

Returns:

Definition at line 137 of file ImageUtils.java.

References ImageUtils.isJPEGFile(), and ImageUtils.readSizeByLoading().

static Dimension readSizeByLoading

(

File

imageFile

)

[static]

Load in the image file just to read the photo size.

.. This should be slower than readSize(...) if most of your images are JPEG files with EXIF headers... Use it if you are loading non-JPEGS or if your JPEGs do not have EXIFs.

Parameters:

imageFile

Returns:

Definition at line 161 of file ImageUtils.java.

Referenced by ImageUtils.readSize().

static long readTimeFrom

(

File

photo

)

[static]

If the EXIF field does not exist, it will return a time representing the file last modified date/time.

TODO Would users rather pick the latest valid time read from the file system (based on an alphabetical sort by name), in the same directory? Maybe it should be a configurable option in whatever software uses this method?

Parameters:

photo

Returns:

Definition at line 177 of file ImageUtils.java.

References ImageUtils.getTimeFromString(), and ImageUtils.readCaptureDateFromEXIF().

static BufferedImage scaleImage	(	BufferedImage	src,
		float	sX,
		float	sY
	)			[static]

Scaled a buffered image by the two scale parameters.

The scale operation is anti-aliased.

Parameters:

	src
	sX
	sY

Returns:

A scaled BufferedImage

Author:

Ron Yeh

Definition at line 196 of file ImageUtils.java.

Referenced by ImageUtils.scaleImageToSize().

static void writeImageToJPEG	(	BufferedImage	buffImage,
		int	quality,
		File	outputFile
	)			[static]

This method is generally BETTER than ImageIO.write(.

..) as that produces low quality output. This method will not work for a 4-banded image. The colors will look incorrect. Use the PNG version instead.

Parameters:

	buffImage
	quality	goes from 0 to 100
	outputFile	Jun 21, 2006

Author:

Ron Yeh

Definition at line 267 of file ImageUtils.java.

static void writeImageToJPEG	(	BufferedImage	bufferedImage,
		File	file
	)			[static]

Parameters:

	bufferedImage
	file

Definition at line 251 of file ImageUtils.java.

static void writeImageToPNG	(	RenderedImage	rImage,
		File	outputFile
	)			[static]

Parameters:

	rImage
	outputFile

Definition at line 300 of file ImageUtils.java.

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The documentation for this class was generated from the following file:

• ImageUtils.java

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