ColorImageDownsampleFactor Property

Summary

Downsample threshold for color images.

Syntax

C++/CLI

Java

Python

public double ColorImageDownsampleFactor { get; set; }

public double getColorImageDownsampleFactor(); 
public void setColorImageDownsampleFactor( 
   double doubleValue 
);

public: 
property double ColorImageDownsampleFactor { 
   double get(); 
   void set (    double ); 
}

ColorImageDownsampleFactor # get and set (PDFOptimizerOptions)

Property Value

This is the ratio of image resolution to output resolution above which downsampling may be performed. Must be between 1.0 through 10.0, inclusive.

Remarks

If you set the threshold out of range, it reverts to a default of 1.5.

Example

Java

using Leadtools.WinForms; 
using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.Controls; 
using Leadtools.Drawing; 
using Leadtools.ImageProcessing; 
using Leadtools.Pdf; 
using Leadtools.Svg; 
 
 
public void PDFFileOptimizerOptionsExample() 
{ 
   string sourceFileName = Path.Combine(LEAD_VARS.ImagesDir, @"Leadtools.pdf"); 
   string destinationFileName = Path.Combine(LEAD_VARS.ImagesDir, @"LEAD_OptimizerOptions.pdf"); 
 
   PDFFile pdfFile = new PDFFile(sourceFileName); 
 
   PDFOptimizerOptions myOptimizerOptions = new PDFOptimizerOptions(); 
   myOptimizerOptions.AutoOptimizerMode = PDFAutoOptimizerMode.Customized; 
 
   myOptimizerOptions.ColorImageDownsamplingMode = PDFDownsamplingMode.Average; 
   myOptimizerOptions.GrayImageDownsamplingMode = PDFDownsamplingMode.Bicubic; 
   myOptimizerOptions.MonoImageDownsamplingMode = PDFDownsamplingMode.Bicubic; 
 
   myOptimizerOptions.ColorImageDownsampleFactor = 2.0; 
   myOptimizerOptions.GrayImageDownsampleFactor = 2.0; 
   myOptimizerOptions.MonoImageDownsampleFactor = 2.0; 
 
   myOptimizerOptions.ColorImageDPI = 150; 
   myOptimizerOptions.GrayImageDPI = 150; 
   myOptimizerOptions.MonoImageDPI = 150; 
 
   // To determine the accepted compression value for ColorImageCompression, GrayImageCompression and MonoImageCompression 
   // uncomment the necessary code below: 
   // 
   // ColorImageCompression 
   // RasterImageFormat[] grayImageFormatAcceptedCompression = PDFOptimizerOptions.SupportedGrayImageFormats; 
   // 
   // GrayImageCompression 
   // RasterImageFormat[] colorImageFormatAcceptedCompression = PDFOptimizerOptions.SupportedColorImageFormats; 
   // 
   // MonoImageCompression 
   // RasterImageFormat[] monoImageFormatAcceptedCompression = PDFOptimizerOptions.SupportedMonoImageFormats; 
 
   myOptimizerOptions.ColorImageCompression = RasterImageFormat.Jpeg; 
   myOptimizerOptions.GrayImageCompression = RasterImageFormat.Jpeg; 
   myOptimizerOptions.MonoImageCompression = RasterImageFormat.Jbig2; 
 
   myOptimizerOptions.EmbedAllFonts = false; 
   myOptimizerOptions.SubsetFonts = true; 
 
   pdfFile.OptimizerOptions = myOptimizerOptions; 
 
   pdfFile.Optimize(destinationFileName); 
} 
 
static class LEAD_VARS 
{ 
   public const string ImagesDir = @"C:\LEADTOOLS23\Resources\Images"; 
}

 
import java.io.ByteArrayInputStream; 
import java.io.File; 
import java.io.FileInputStream; 
import java.io.FileNotFoundException; 
import java.io.FileOutputStream; 
import java.io.FileReader; 
import java.io.IOException; 
import java.io.InputStream; 
import java.nio.file.Files; 
import java.nio.file.Paths; 
import java.nio.file.StandardCopyOption; 
import java.util.ArrayList; 
import java.util.Date; 
import java.util.List; 
import java.util.Scanner; 
 
import org.junit.*; 
import org.junit.runner.JUnitCore; 
import org.junit.runner.Result; 
import org.junit.runner.notification.Failure; 
import static org.junit.Assert.*; 
 
import leadtools.*; 
import leadtools.codecs.*; 
import leadtools.pdf.*; 
 
 
public void pdfFileOptimizerOptionsExample() { 
 
   final String LEAD_VARS_IMAGES_DIR = "C:\\LEADTOOLS23\\Resources\\Images"; 
   String sourceFileName = combine(LEAD_VARS_IMAGES_DIR, "Leadtools.pdf"); 
   String destinationFileName = combine(LEAD_VARS_IMAGES_DIR, 
         "LEAD_OptimizerOptions.pdf"); 
 
   PDFFile pdfFile = new PDFFile(sourceFileName); 
 
   PDFOptimizerOptions myOptimizerOptions = new PDFOptimizerOptions(); 
   myOptimizerOptions.setAutoOptimizerMode(PDFAutoOptimizerMode.CUSTOMIZED); 
 
   myOptimizerOptions.setColorImageDownsamplingMode(PDFDownsamplingMode.AVERAGE); 
   myOptimizerOptions.setGrayImageDownsamplingMode(PDFDownsamplingMode.BICUBIC); 
   myOptimizerOptions.setMonoImageDownsamplingMode(PDFDownsamplingMode.BICUBIC); 
 
   myOptimizerOptions.setColorImageDownsampleFactor(2.0); 
   myOptimizerOptions.setGrayImageDownsampleFactor(2.0); 
   myOptimizerOptions.setMonoImageDownsampleFactor(2.0); 
 
   myOptimizerOptions.setColorImageDPI(150); 
   myOptimizerOptions.setGrayImageDPI(150); 
   myOptimizerOptions.setMonoImageDPI(150); 
 
   // To determine the accepted compression value for ColorImageCompression, 
   // GrayImageCompression and MonoImageCompression: 
   // uncomment the necessary code below: 
   // 
   // ColorImageCompression 
   // RasterImageFormat[] grayImageFormatAcceptedCompression = 
   // PDFOptimizerOptions.SupportedGrayImageFormats; 
   // 
   // GrayImageCompression 
   // RasterImageFormat[] colorImageFormatAcceptedCompression = 
   // PDFOptimizerOptions.SupportedColorImageFormats; 
   // 
   // MonoImageCompression 
   // RasterImageFormat[] monoImageFormatAcceptedCompression = 
   // PDFOptimizerOptions.SupportedMonoImageFormats; 
 
   myOptimizerOptions.setColorImageCompression(RasterImageFormat.JPEG); 
   myOptimizerOptions.setGrayImageCompression(RasterImageFormat.JPEG); 
   myOptimizerOptions.setMonoImageCompression(RasterImageFormat.JBIG2); 
 
   myOptimizerOptions.setEmbedAllFonts(false); 
   myOptimizerOptions.setSubsetFonts(true); 
 
   pdfFile.setOptimizerOptions(myOptimizerOptions); 
 
   pdfFile.optimize(destinationFileName); 
   assertTrue(pdfFile.getOptimizerOptions().equals(myOptimizerOptions)); 
 
}

Requirements

Target Platforms

Reference

PDFOptimizerOptions Class

PDFOptimizerOptions Members

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Help Version 23.0.2024.2.29

Leadtools.Pdf Assembly

Introduction

Getting Started

Namespaces

Leadtools.Pdf Namespace

Assemblies