org.apache.pdfbox.tools.imageio

Class ImageIOUtil

java.lang.Object

org.apache.pdfbox.tools.imageio.ImageIOUtil

public final class ImageIOUtil
extends Object

Handles some ImageIO operations.

Method Summary

Modifier and Type	Method and Description
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 filename, int dpi, float compressionQuality) 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 compressionQuality) Writes a buffered image to a file using the given image format.
static boolean	writeImage(BufferedImage image, String formatName, OutputStream output, int dpi, float compressionQuality, String compressionType) Writes a buffered image to a file using the given image format.

Methods inherited from class java.lang.Object

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

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. The compression is set for maximum compression for PNG and maximum quality for all other file formats. See writeImage(BufferedImage image, String formatName, OutputStream output, int dpi, float compressionQuality) 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) to be used in metadata

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 filename,
                                 int dpi,
                                 float compressionQuality)
                          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 compressionQuality) 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) to be used in metadata

compressionQuality - quality to be used when compressing the image (0 < compressionQuality < 1.0f). See ImageWriteParam.setCompressionQuality(float) for more details.

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. The compression is set for maximum compression for PNG and maximum quality for all other file formats. See writeImage(BufferedImage image, String formatName, OutputStream output, int dpi, float compressionQuality) 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. The compression is set for maximum compression for PNG and maximum quality for all other file formats. See writeImage(BufferedImage image, String formatName, OutputStream output, int dpi, float compressionQuality) 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 - the resolution in dpi (dots per inch) to be used in metadata

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 compressionQuality)
                          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 compressionQuality 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 (or equivalent) 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 - the resolution in dpi (dots per inch) to be used in metadata

compressionQuality - quality to be used when compressing the image (0 < compressionQuality < 1.0f). See ImageWriteParam.setCompressionQuality(float) for more details.

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 compressionQuality,
                                 String compressionType)
                          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 compressionQuality 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 - the resolution in dpi (dots per inch) to be used in metadata

compressionQuality - quality to be used when compressing the image (0 < compressionQuality < 1.0f). See ImageWriteParam.setCompressionQuality(float) for more details.

compressionType - Advanced users only, and only relevant for TIFF files: If null, save uncompressed; if empty string, use logic explained above; other valid values are found in the javadoc of TIFFImageWriteParam.

Returns:

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

Throws:

IOException - if an I/O error occurs