Module org.sejda.sambox

Package org.sejda.sambox.pdmodel.graphics.image

Class LosslessFactory

java.lang.Object

org.sejda.sambox.pdmodel.graphics.image.LosslessFactory

public final class LosslessFactory
extends Object

Factory for creating a PDImageXObject containing a lossless compressed image.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
private static class	LosslessFactory.PredictorEncoder

Field Summary

Fields

Modifier and Type	Field	Description
(package private) static boolean	usePredictorEncoder	Internal, only for benchmark purpose

Constructor Summary

Constructors

Modifier	Constructor	Description
private	LosslessFactory()

Method Summary

Modifier and Type	Method	Description
private static PDImageXObject	createFromGrayImage(BufferedImage image)
static PDImageXObject	createFromImage(BufferedImage image)	Creates a new lossless encoded image XObject from a BufferedImage.
private static PDImageXObject	createFromRGBImage(BufferedImage image)
private static boolean	isGrayImage(BufferedImage image)
(package private) static PDImageXObject	prepareImageXObject(byte[] byteArray, int width, int height, int bitsPerComponent, PDColorSpace initColorSpace)	Create a PDImageXObject while making a decision whether not to compress, use Flate filter only, or Flate and LZW filters.

Methods inherited from class java.lang.Object

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

Field Details

usePredictorEncoder

static boolean usePredictorEncoder

Internal, only for benchmark purpose

Constructor Details

LosslessFactory

private LosslessFactory()

Method Details

createFromImage

public static PDImageXObject createFromImage(BufferedImage image)
                                      throws IOException

Creates a new lossless encoded image XObject from a BufferedImage.

New for advanced users from 2.0.12 on:
If you created your image with a non standard ICC colorspace, it will be preserved. (If you load images in java using ImageIO then no need to read this segment) However a new colorspace will be created for each image. So if you create a PDF with several such images, consider replacing the colorspace with a common object to save space. This is done with PDImageXObject.getColorSpace() and PDImageXObject.setColorSpace()

Parameters:

document - the document where the image will be created

image - the BufferedImage to embed

Returns:

a new image XObject

Throws:

IOException - if something goes wrong

isGrayImage

private static boolean isGrayImage(BufferedImage image)

createFromGrayImage

private static PDImageXObject createFromGrayImage(BufferedImage image)
                                           throws IOException

Throws:

IOException

createFromRGBImage

private static PDImageXObject createFromRGBImage(BufferedImage image)
                                          throws IOException

Throws:

IOException

prepareImageXObject

static PDImageXObject prepareImageXObject(byte[] byteArray,
 int width,
 int height,
 int bitsPerComponent,
 PDColorSpace initColorSpace)
                                   throws IOException

Create a PDImageXObject while making a decision whether not to compress, use Flate filter only, or Flate and LZW filters.

Parameters:

document - The document.

byteArray - array with data.

width - the image width

height - the image height

bitsPerComponent - the bits per component

initColorSpace - the color space

Returns:

the newly created PDImageXObject with the data compressed.

Throws:

IOException