Comments Property

Summary

The collection of comment data used when reading and writing certain file formats (including GIF).

Syntax

Objective-C

C++/CLI

Java

Python

public ObservableCollection<RasterCommentMetadata> Comments { get; }

@property (nonatomic, assign, readonly, nullable) NSMutableArray<LTRasterCommentMetadata *> *comments

public RasterCollection<RasterCommentMetadata> getComments();

public: 
property ObservableCollection<RasterCommentMetadata^>^ Comments { 
   ObservableCollection<RasterCommentMetadata^>^ get(); 
}

Comments # get  (RasterImage)

Property Value

A collection of RasterCommentMetadata used when reading and writing certain file formats (including GIF).

Remarks

Several formats allow you to store non-image data such as comments, tags, and markers.

You can manipulate the comments of an image by adding/removing RasterCommentMetadata objects to this collection.

By setting the CodecsSaveOptions.Comments property to true before calling RasterCodecs.Save, you can save the comments in this collection when the image is saved into a file.

By setting the CodecsLoadOptions.Markers property to true before calling RasterCodecs.Load, you can load all the markers (if any) into this collection when an image is loaded from a file.

You can use the RasterCodecs.WriteMarkers method to save the markers directly to an existing file.

For more information, refer to Non Image Data and Types of File Comments.

Example

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; 
 
 
private void DisplayComment(RasterCommentMetadata comment) 
{ 
	switch (comment.DataType) 
	{ 
		case RasterCommentMetadataDataType.Ascii: 
			Console.WriteLine("Comment of type " + comment.Type.ToString() + " = " + comment.ToAscii()); 
			break; 
	} 
} 
		public void CommentsExample() 
{ 
	RasterCodecs codecs = new RasterCodecs(); 
	RasterImage image = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "IMAGE1.CMP")); 
 
	//Ascii 
	RasterCommentMetadata commentDataAscii = new RasterCommentMetadata(); 
	// set the artist comment 
	commentDataAscii.Type = RasterCommentMetadataType.Artist; 
	commentDataAscii.FromAscii("Test String"); 
	image.Comments.Add(commentDataAscii); 
 
	codecs.Options.Save.Comments = true; 
	codecs.Save(image, Path.Combine(LEAD_VARS.ImagesDir, "IMAGE1_COMMENTS.TIF"), RasterImageFormat.Tif, 0); 
	// load the comment together with the image 
 
	RasterCommentMetadata comment = codecs.ReadComment(Path.Combine(LEAD_VARS.ImagesDir, "IMAGE1_COMMENTS.TIF"), 1, RasterCommentMetadataType.Artist); 
	DisplayComment(comment); 
 
	codecs.Dispose(); 
} 
 
static class LEAD_VARS 
{ 
   public const string ImagesDir = @"C:\LEADTOOLS22\Resources\Images"; 
}

 
import java.io.File; 
import java.io.IOException; 
import java.time.LocalDateTime; 
 
import org.junit.*; 
import org.junit.Test; 
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.barcode.*; 
import leadtools.codecs.*; 
 
 
public void CommentsExample() 
{ 
   RasterCodecs codecs = new RasterCodecs(); 
   RasterImage image = codecs.load(combine(LEAD_VARS.ImagesDir, "IMAGE1.CMP")); 
   //Ascii 
   RasterCommentMetadata commentDataAscii = new RasterCommentMetadata(); 
   // set the artist comment 
   commentDataAscii.setType(RasterCommentMetadataType.ARTIST); 
   commentDataAscii.fromAscii("Test String"); 
   image.getComments().add(commentDataAscii); 
   codecs.getOptions().getSave().setComments(true); 
   codecs.save(image, combine(LEAD_VARS.ImagesDir, "IMAGE_TEST_COMMENTS.TIF"), RasterImageFormat.TIF, 0); 
   // load the comment together with the image 
   RasterCommentMetadata comment = codecs.readComment(combine(LEAD_VARS.ImagesDir, "IMAGE_TEST_COMMENTS.TIF"), 1, RasterCommentMetadataType.ARTIST); 
   displayComment(comment); 
   assertTrue("Comment Meta Data is ASCII",comment.getDataType() == RasterCommentMetadataDataType.ASCII); 
   codecs.dispose(); 
} 
 
private void displayComment(RasterCommentMetadata comment) 
{ 
   switch (comment.getDataType()) 
   { 
      case ASCII: 
         System.out.println("Comment of type " + comment.getDataType().toString() + " = " + comment.toAscii()); 
         break; 
      case BYTE: 
      case INT_16: 
      case RATIONAL: 
      case URATIONAL: 
      default: 
         break; 
   } 
} 
 
 
public class LEAD_VARS 
{ 
   public final static String ImagesDir = "C:\LEADTOOLS22\Resources\Images"; 
}

Requirements

Target Platforms

Reference

RasterImage Class

RasterImage Members

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Help Version 22.0.2023.5.16

Leadtools Assembly

Introduction

Getting Started

Namespaces

Leadtools Namespace

Leadtools.ImageProcessing Namespace

Assemblies