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JpegQualityFactor Property

Gets or sets a value that represents the quality factor to be used when optimizing an image.

public int JpegQualityFactor { get; set; } 
property int JpegQualityFactor { 
   int get(); 
   void set (    int ); 
JpegQualityFactor # get and set (ImageOptimizerOptions) 

Property Value

The JpegQualityFactor is a number used to balance between loss and quality during compression. You can set a value from 2 to 255, where 2 represents the highest quality and 255 represents the most compression. The default value is 35.


The JpegQualityFactor is used only if the original image format is one of the following Jpeg formats:

using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.ImageOptimization; 
public void TestJpegImageOptimizer() 
   // Initialize the RasterCodecs class 
   RasterCodecs codecs = new RasterCodecs(); 
   // The input and output location 
   string inputFileName = Path.Combine(LEAD_VARS.ImagesDir, "Cannon.jpg"); 
   string outputFolder = Path.Combine(LEAD_VARS.ImagesDir, "OptimizedImages"); 
   // Initialize a new Optimizer object 
   ImageOptimizer optimizer = new ImageOptimizer(); 
   // Optimization Options 
   ImageOptimizerOptions options = ImageOptimizerOptions.Default; 
   // Set custom optimization options 
   options.JpegQualityFactor = 255; 
   options.JpegColorSpace = ImageOptimizerJpegColorSpace.JpegColorSpace422; 
   // Load the input file into a memory byte array 
   byte[] orgBuffer = File.ReadAllBytes(inputFileName); 
   // Optimize this buffer 
   byte[] optBuffer = optimizer.OptimizeBuffer(codecs, orgBuffer, 0, orgBuffer.Length, options, OptimizeBufferProgress); 
   // Save this image into the output folder 
   // Make sure the output folder exists 
   if (!Directory.Exists(outputFolder)) 
   // Get the name of the output file from the input file 
   string outputFileName = Path.Combine(outputFolder, Path.GetFileName(inputFileName)); 
   // Save the optimized buffer to the output file 
   using (FileStream fs = File.Create(outputFileName)) 
      fs.Write(optBuffer, 0, optBuffer.Length); 
   // Compare the original image size with the optimized size 
   long orgSize = new FileInfo(inputFileName).Length; 
   long optSize = new FileInfo(outputFileName).Length; 
   int percentage = (int)((double)optSize * 100.0 / orgSize); 
   string message = string.Format( 
      "Original image size: {0} KB{1}Optimized image size: {2} KB{1}Percentage: {3}%", 
      orgSize / 1024, Environment.NewLine, optSize / 1024, 
      100 - percentage); 
   //shutdown the RasterCodecs class. 
static bool OptimizeBufferProgress(int percent) 
   Console.WriteLine(string.Format("{0}%", percent)); 
   return true; 
static class LEAD_VARS 
   public const string ImagesDir = @"C:\LEADTOOLS22\Resources\Images"; 

Target Platforms

Help Version 22.0.2023.3.31
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© 1991-2023 LEAD Technologies, Inc. All Rights Reserved.

Products | Support | Contact Us | Intellectual Property Notices
© 1991-2023 LEAD Technologies, Inc. All Rights Reserved.