ChangeCompression Method

Summary

Compresses or decompresses this RasterImage.

Syntax

C++/CLI

Java

Python

public void ChangeCompression( 
   RasterCompression compression 
)

public void changeCompression( 
   RasterCompression compression 
);

public: 
void ChangeCompression(  
   RasterCompression compression 
)

def ChangeCompression(self,compression):

Parameters

compression
Indicates the type of compression to use on the image.

Remarks

This method is available only in (Document/Medical only) toolkits.

For more information, refer to Speeding Up 1-Bit Documents.

This method does not support signed images.

Example

This example toggles image compression.

Java

using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.ImageProcessing; 
using Leadtools.ImageProcessing.Core; 
using Leadtools.ImageProcessing.Color; 
using Leadtools.Dicom; 
using Leadtools.Drawing; 
using Leadtools.Controls; 
using Leadtools.Svg; 
 
 
public void ChangeCompressionTest() 
{ 
   // This method toggles image compression. 
   RasterCodecs codecs = new RasterCodecs(); 
 
   // Load the image compressed 
   codecs.Options.Load.Compressed = true; 
   RasterImage image = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "OCR1.TIF")); 
   String str = "BEFORE - ImageSize: " + image.DataSize + " bytes, Type: " + (image.IsCompressed ? "Compressed" : "UnCompressed"); 
   Console.WriteLine(str, "ChangeCompression"); 
   image.ChangeCompression((image.IsCompressed == true) ? RasterCompression.None : RasterCompression.Rle); 
   str = "AFTER - ImageSize: " + image.DataSize + " bytes, Type: " + (image.IsCompressed ? "Compressed" : "UnCompressed"); 
   Console.WriteLine(str, "ChangeCompression"); 
 
   // Load the image super-compressed 
   codecs.Options.Load.SuperCompressed = true; 
   image = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "IMAGE1.CMP")); 
   str = "BEFORE - ImageSize: " + image.DataSize + " bytes, Type: " + (image.IsSuperCompressed ? "Compressed" : "UnCompressed"); 
   Console.WriteLine(str, "ChangeCompression"); 
   image.ChangeCompression((image.IsSuperCompressed == true) ? RasterCompression.None : RasterCompression.Super); 
   str = "AFTER - ImageSize: " + image.DataSize + " bytes, Type: " + (image.IsSuperCompressed ? "Compressed" : "UnCompressed"); 
   Console.WriteLine(str, "ChangeCompression"); 
 
   image.Dispose(); 
   codecs.Dispose(); 
} 
 
static class LEAD_VARS 
{ 
   public const string ImagesDir = @"C:\LEADTOOLS23\Resources\Images"; 
}

 
import java.io.File; 
import java.io.FileInputStream; 
import java.io.IOException; 
import java.io.InputStream; 
import java.util.ArrayList; 
import java.util.List; 
 
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.imageprocessing.core.*; 
import leadtools.svg.*; 
import leadtools.imageprocessing.CloneCommand; 
import leadtools.imageprocessing.FillCommand; 
import leadtools.imageprocessing.FlipCommand; 
import leadtools.imageprocessing.GrayscaleCommand; 
import leadtools.imageprocessing.color.InvertCommand; 
import leadtools.imageprocessing.color.PosterizeCommand; 
 
 
public void changeCompressionTest() { 
   // This method toggles image compression. 
   final String LEAD_VARS_IMAGES_DIR = "C:\\LEADTOOLS23\\Resources\\Images"; 
   RasterCodecs codecs = new RasterCodecs(); 
   String destFileName = combine(LEAD_VARS_IMAGES_DIR, "result.cmp"); 
 
   // Load the image compressed 
   codecs.getOptions().getLoad().setCompressed(true); 
   RasterImage image = codecs.load(combine(LEAD_VARS_IMAGES_DIR, "OCR1.TIF")); 
   String str = "BEFORE - ImageSize: " + image.getDataSize() + " bytes, Type: " 
         + (image.isCompressed() ? "Compressed" : "UnCompressed"); 
   System.out.println(str + " ChangeCompression"); 
   image.changeCompression((image.isCompressed() == true) ? RasterCompression.NONE : RasterCompression.RLE); 
   str = "AFTER - ImageSize: " + image.getDataSize() + " bytes, Type: " 
         + (image.isCompressed() ? "Compressed" : "UnCompressed"); 
   System.out.println(str + " ChangeCompression"); 
 
   // Load the image super-compressed 
   codecs.getOptions().getLoad().setSuperCompressed(true); 
   image = codecs.load(combine(LEAD_VARS_IMAGES_DIR, "IMAGE1.CMP")); 
   str = "BEFORE - ImageSize: " + image.getDataSize() + " bytes, Type: " 
         + (image.isSuperCompressed() ? "Compressed" : "UnCompressed"); 
   System.out.println(str + " ChangeCompression"); 
   image.changeCompression((image.isSuperCompressed() == true) ? RasterCompression.NONE : RasterCompression.SUPER); 
   str = "AFTER - ImageSize: " + image.getDataSize() + " bytes, Type: " 
         + (image.isSuperCompressed() ? "Compressed" : "UnCompressed"); 
   System.out.println(str + " ChangeCompression"); 
 
   // Save it 
   codecs.save(image, destFileName, RasterImageFormat.CMP, 0); 
 
   // Clean up 
   image.dispose(); 
   codecs.dispose(); 
 
   assertTrue("file unsuccessfully saved to " + destFileName, (new File(destFileName)).exists()); 
   System.out.printf("File saved successfully to %s%n", destFileName); 
}

Requirements

Target Platforms

Reference

RasterImage Class

RasterImage Members

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