NoLzwAutoClear Property

Summary

Gets a value indicating whether to automatically insert CLEAR codes during LZW compression.

Syntax

Objective-C

C++/CLI

Java

Python

public bool NoLzwAutoClear { get; set; }

@property (nonatomic, assign) BOOL noLzwAutoClear;

public boolean getNoLzwAutoClear() 
public void setNoLzwAutoClear(boolean value)

public: 
property bool NoLzwAutoClear { 
   bool get(); 
   void set (    bool ); 
}

NoLzwAutoClear # get and set (CodecsTiffSaveOptions)

Property Value

Value	Description
true	To disable insert of CLEAR codes.
false	To enable insert of CLEAR codes. The default value is false.

Remarks

This option can be used when saving TIFF LZW files. To save files compatible with some buggy LZW decoders that cannot handle early CLEAR codes. Some IBM decoders are known to have this problem. They will not decode LEAD TIFF LZW files unless this property is set to true.

This property is set to false by default, which allows LEADTOOLS to insert CLEAR LZW codes and reset the LZW compression engine if the compression ratio is not adequate.

Example

using Leadtools; 
using Leadtools.Codecs; 
 
using Leadtools.ImageProcessing.Core; 
 
public void CodecsTiffOptionsExample() 
{ 
   RasterCodecs codecs = new RasterCodecs(); 
 
   string srcFileName = Path.Combine(LEAD_VARS.ImagesDir, "OCR1.TIF"); 
 
   // Get all Information about the Tiff file that you want to load. 
   CodecsImageInfo imageInfo = codecs.GetInformation(srcFileName, true); 
 
   if (imageInfo.Tiff.IsImageFileDirectoryOffsetValid) 
   { 
      codecs.Options.Tiff.Load.ImageFileDirectoryOffset = imageInfo.Tiff.ImageFileDirectoryOffset; 
      codecs.Options.Tiff.Save.ImageFileDirectoryOffset = imageInfo.Tiff.ImageFileDirectoryOffset; 
   } 
 
   // CodecsTiffOptions & CodecsTiffLoadOptions reference 
   codecs.Options.Tiff.Load.UseImageFileDirectoryOffset = imageInfo.Tiff.IsImageFileDirectoryOffsetValid; 
   codecs.Options.Tiff.Save.UseImageFileDirectoryOffset = imageInfo.Tiff.IsImageFileDirectoryOffsetValid; 
 
   codecs.Options.Tiff.Load.IgnorePhotometricInterpretation = true; 
   codecs.Options.Tiff.Load.IgnoreViewPerspective = false; 
   codecs.Options.Tiff.Load.UseFastConversion = false; 
 
   RasterImage image = codecs.Load(srcFileName); 
 
   codecs.Options.Tiff.Save.NoPalette = imageInfo.Tiff.HasNoPalette; 
   codecs.Options.Tiff.Save.PreservePalette = imageInfo.Tiff.HasNoPalette; 
 
   // Set the tiffSave options 
   // CodecsTiffSaveOptions reference 
   codecs.Options.Tiff.Save.NoPageNumber = false; 
   codecs.Options.Tiff.Save.NoSubFileType = false; 
   codecs.Options.Tiff.Save.UsePhotometricInterpretation = true; 
   codecs.Options.Tiff.Save.PhotometricInterpretation = CodecsTiffPhotometricInterpretation.YcbCr; 
   codecs.Options.Tiff.Save.UseTileSize = true; 
   codecs.Options.Tiff.Save.TileHeight = 200; 
   codecs.Options.Tiff.Save.TileWidth = 200; 
   codecs.Options.Tiff.Save.NoLzwAutoClear = false; 
   codecs.Options.Tiff.Save.SavePlanar = false; 
   codecs.Options.Tiff.Save.UsePredictor = false; 
 
   // make the output file have the same format as the input, so Tiff->Tiff, BigTiff->BigTiff 
   codecs.Options.Tiff.Save.BigTiff = imageInfo.Tiff.IsBigTiff; 
 
   //saving the image 
   codecs.Save(image, Path.Combine(LEAD_VARS.ImagesDir, "testtiff1.TIF"), RasterImageFormat.Tif, image.BitsPerPixel, 1, image.PageCount, 1, CodecsSavePageMode.Overwrite); 
 
   //change some tiffsave options. 
   codecs.Options.Tiff.Save.NoPageNumber = true; 
   codecs.Options.Tiff.Save.NoSubFileType = true; 
   codecs.Options.Tiff.Save.UsePhotometricInterpretation = false; 
   codecs.Options.Tiff.Save.UseTileSize = false; 
   codecs.Options.Tiff.Save.NoPalette = false; 
   codecs.Options.Tiff.Save.PreservePalette = true; 
   codecs.Options.Tiff.Save.PhotometricInterpretation = CodecsTiffPhotometricInterpretation.Palette; 
 
   //save the image with different name. 
   codecs.Save(image, Path.Combine(LEAD_VARS.ImagesDir, "testtiff2.TIF"), RasterImageFormat.CcittGroup4, image.BitsPerPixel, 1, image.PageCount, 1, CodecsSavePageMode.Overwrite); 
 
   // Clean up 
   image.Dispose(); 
   codecs.Dispose(); 
} 
 
static class LEAD_VARS 
{ 
   public const string ImagesDir = @"C:\LEADTOOLS22\Resources\Images"; 
}

Requirements

Target Platforms

Reference

CodecsTiffSaveOptions Class

CodecsTiffSaveOptions Members

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Help Version 22.0.2023.5.5

Leadtools.Codecs Assembly

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