com.itextpdf.pdfoptimizer.handlers.imagequality.processors

Class BitmapCompressor

java.lang.Object

com.itextpdf.pdfoptimizer.handlers.imagequality.processors.BitmapCompressor

All Implemented Interfaces:

IImageProcessor

public class BitmapCompressor
extends Object
implements IImageProcessor

Class is used to optimize bitmap images.

Constructor Summary

Constructors

Constructor and Description
BitmapCompressor(double scaling, double compression) Creates a new instance of processor.
BitmapCompressor(double scaling, IScalingAlgorithm algorithm, double compression) Creates a new instance of processor.

Method Summary

Modifier and Type	Method and Description
com.itextpdf.kernel.pdf.xobject.PdfImageXObject	processImage(com.itextpdf.kernel.pdf.xobject.PdfImageXObject objectToProcess, OptimizationSession session) Optimizes a bitmap image: scales it, changes color scheme from CMYK to RGB if necessary and then compressed it as JPEG.

Methods inherited from class java.lang.Object

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

Constructor Detail

BitmapCompressor

public BitmapCompressor(double scaling,
                        double compression)

Creates a new instance of processor. By default AverageCalculationAlgorithm is used for scaling.

Parameters:

scaling - is a scaling coefficient, must be in range [0., 1.]

compression - is a compression coefficient, must be in range [0., 1.]

BitmapCompressor

public BitmapCompressor(double scaling,
                        IScalingAlgorithm algorithm,
                        double compression)

Creates a new instance of processor.

Parameters:

scaling - is a scaling coefficient, must be in range [0., 1.]

algorithm - is a scaling algorithm

compression - is a compression coefficient, must be in range [0., 1.]

Method Detail

processImage

public com.itextpdf.kernel.pdf.xobject.PdfImageXObject processImage(com.itextpdf.kernel.pdf.xobject.PdfImageXObject objectToProcess,
                                                                    OptimizationSession session)
                                                             throws IOException

Optimizes a bitmap image: scales it, changes color scheme from CMYK to RGB if necessary and then compressed it as JPEG.

Specified by:

processImage in interface IImageProcessor

Parameters:

objectToProcess - is a PdfImageXObject representing the image

session - is an auxiliary object used to support share data between stages of optimization process

Returns:

processed image if processing can be performed and the same instance otherwise

Throws:

IOException - if image cannot be optimized as JPEG