org.apache.pdfbox.util
Class ImageIOUtil

java.lang.Object
  org.apache.pdfbox.util.ImageIOUtil

public class ImageIOUtil
extends Object

Handles some ImageIO operations.

Field Summary

static float	DEFAULT_COMPRESSION_QUALITY Default compression quality: 1.0f.
static int	DEFAULT_SCREEN_RESOLUTION Default screen resolution: 72dpi.

Method Summary

static boolean	writeImage(BufferedImage image, String filename, int dpi) Writes a buffered image to a file using the given image format.
static boolean	writeImage(BufferedImage image, String formatName, OutputStream output) Writes a buffered image to a file using the given image format.
static boolean	writeImage(BufferedImage image, String formatName, OutputStream output, int dpi) Writes a buffered image to a file using the given image format.
static boolean	writeImage(BufferedImage image, String formatName, OutputStream output, int dpi, float quality) Writes a buffered image to a file using the given image format.
static boolean	writeImage(BufferedImage image, String formatName, String filename, int dpi) Deprecated. use writeImage(BufferedImage image, String filename, int dpi), which uses the full filename instead of just the prefix.

Methods inherited from class java.lang.Object

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

Field Detail

DEFAULT_SCREEN_RESOLUTION

public static final int DEFAULT_SCREEN_RESOLUTION

Default screen resolution: 72dpi.

See Also:

Constant Field Values

DEFAULT_COMPRESSION_QUALITY

public static final float DEFAULT_COMPRESSION_QUALITY

Default compression quality: 1.0f.

See Also:

Constant Field Values

Method Detail

writeImage

public static boolean writeImage(BufferedImage image,
                                 String filename,
                                 int dpi)
                          throws IOException

Writes a buffered image to a file using the given image format. See writeImage(BufferedImage image, String formatName, OutputStream output, int dpi, float quality) for more details.

Parameters:

image - the image to be written

filename - used to construct the filename for the individual image. Its suffix will be used as the image format.

dpi - the resolution in dpi (dots per inch)

Returns:

true if the image file was produced, false if there was an error.

Throws:

IOException - if an I/O error occurs

writeImage

@Deprecated
public static boolean writeImage(BufferedImage image,
                                            String formatName,
                                            String filename,
                                            int dpi)
                          throws IOException

Deprecated. use writeImage(BufferedImage image, String filename, int dpi), which uses the full filename instead of just the prefix.

Writes a buffered image to a file using the given image format. See writeImage(BufferedImage image, String formatName, OutputStream output, int dpi, float quality) for more details.

Parameters:

image - the image to be written

formatName - the target format (ex. "png") which is also the suffix for the filename

filename - used to construct the filename for the individual image. The formatName parameter will be used as the suffix.

dpi - the resolution in dpi (dots per inch)

Returns:

true if the image file was produced, false if there was an error.

Throws:

IOException - if an I/O error occurs

writeImage

public static boolean writeImage(BufferedImage image,
                                 String formatName,
                                 OutputStream output)
                          throws IOException

Writes a buffered image to a file using the given image format. See writeImage(BufferedImage image, String formatName, OutputStream output, int dpi, float quality) for more details.

Parameters:

image - the image to be written

formatName - the target format (ex. "png")

output - the output stream to be used for writing

Returns:

true if the image file was produced, false if there was an error.

Throws:

IOException - if an I/O error occurs

writeImage

public static boolean writeImage(BufferedImage image,
                                 String formatName,
                                 OutputStream output,
                                 int dpi)
                          throws IOException

Writes a buffered image to a file using the given image format. See writeImage(BufferedImage image, String formatName, OutputStream output, int dpi, float quality) for more details.

Parameters:

image - the image to be written

formatName - the target format (ex. "png")

output - the output stream to be used for writing

dpi - resolution to be used when writing the image

Returns:

true if the image file was produced, false if there was an error.

Throws:

IOException - if an I/O error occurs

writeImage

public static boolean writeImage(BufferedImage image,
                                 String formatName,
                                 OutputStream output,
                                 int dpi,
                                 float quality)
                          throws IOException

Writes a buffered image to a file using the given image format. Compression is fixed for PNG, GIF, BMP and WBMP, dependent of the quality parameter for JPG, and dependent of bit count for TIFF (a bitonal image will be compressed with CCITT G4, a color image with LZW). Creating a TIFF image is only supported if the jai_imageio library is in the class path.

Parameters:

image - the image to be written

formatName - the target format (ex. "png")

output - the output stream to be used for writing

dpi - resolution to be used when writing the image

quality - quality to be used when compressing the image (0 < quality < 1.0f)

Returns:

true if the image file was produced, false if there was an error.

Throws:

IOException - if an I/O error occurs