RasterTagMetadata Class

Summary

Extends the RasterMetadata class to provide functionality for dealing with tag metadata stored within various image file formats.

Syntax

Objective-C

C++

Java

[SerializableAttribute()] 
public class RasterTagMetadata : RasterMetadata

<SerializableAttribute()> 
Public Class RasterTagMetadata  
   Inherits RasterMetadata

@interface LTRasterTagMetadata : LTRasterMetadata

public class RasterTagMetadata extends RasterMetadata implements Serializable

[SerializableAttribute()] 
public ref class RasterTagMetadata : public RasterMetadata

Remarks

The TIFF file formats support a number of comments that are saved and loaded using predefined tags.

If the comments do not meet your needs, you can define your own tag for saving additional non-raster data in a TIFF file. For example, you may want to define a tag to save annotations.

The TIFF 6.0 Specification sets aside a range of private tags that developers can define. To avoid conflicts with files created by other developers, you can register your tag by contacting Adobe Developer Relations. The E-Mail address posted on The Unofficial TIFF Home Page is gapdevsup@adobe.com.

Some restrictions apply to this function if you use an IFD to indicate to which page to write the metadata. See the Loading And Saving Large TIFF Files topic for more information.

Example

This example will save then load some tags to/from a tif file.

using Leadtools; 
using Leadtools.Codecs; 
 
 
public void RasterTagMetadataExample() 
{ 
	RasterCodecs codecs = new RasterCodecs(); 
	codecs.ThrowExceptionsOnInvalidImages = true; 
 
	string srcFileName = Path.Combine(LEAD_VARS.ImagesDir, "Image1.cmp"); 
	string destFileName = Path.Combine(LEAD_VARS.ImagesDir, "Image1_tags.tif"); 
 
	// Load the image 
	RasterImage image = codecs.Load(srcFileName); 
 
	// add the tags 
	const int tagSoftware = 0x8001; 
 
	RasterTagMetadata tag; 
 
	// Ascii 
	tag = new RasterTagMetadata(); 
	tag.Id = tagSoftware; 
	tag.DataType = RasterTagMetadataDataType.Ascii; 
	tag.FromAscii("Test String"); 
	image.Tags.Add(tag); 
 
	// Byte 
	tag = new RasterTagMetadata(); 
	tag.Id = tagSoftware; 
	tag.DataType = RasterTagMetadataDataType.Byte; 
	byte[] byteArray = new byte[1]; 
	byteArray[0] = 10; 
	tag.FromByte(byteArray); 
	image.Tags.Add(tag); 
 
	// SByte 
	tag = new RasterTagMetadata(); 
	tag.Id = tagSoftware; 
	tag.DataType = RasterTagMetadataDataType.SByte; 
	sbyte[] sbyteArray = new sbyte[1]; 
	sbyteArray[0] = -45; 
	tag.FromSByte(sbyteArray); 
	image.Tags.Add(tag); 
 
	// Int16 
	tag = new RasterTagMetadata(); 
	tag.Id = tagSoftware; 
	tag.DataType = RasterTagMetadataDataType.Int16; 
	short[] shortArray = new short[1]; 
	shortArray[0] = 64; 
	tag.FromInt16(shortArray); 
	image.Tags.Add(tag); 
 
	// Uint16 
	tag = new RasterTagMetadata(); 
	tag.Id = tagSoftware; 
	tag.DataType = RasterTagMetadataDataType.UInt16; 
	ushort[] uint16Array = new ushort[1]; 
	uint16Array[0] = 50; 
	tag.FromUInt16(uint16Array); 
	image.Tags.Add(tag); 
 
	// Int32 
	tag = new RasterTagMetadata(); 
	tag.Id = tagSoftware; 
	tag.DataType = RasterTagMetadataDataType.Int32; 
	int[] intArray = new int[1]; 
	intArray[0] = -1326; 
	tag.FromInt32(intArray); 
	image.Tags.Add(tag); 
 
	// Uint32 
	tag = new RasterTagMetadata(); 
	tag.Id = tagSoftware; 
	tag.DataType = RasterTagMetadataDataType.UInt32; 
	uint[] uintArray = new uint[1]; 
	uintArray[0] = 1326; 
	tag.FromUInt32(uintArray); 
	image.Tags.Add(tag); 
 
	// single 
	tag = new RasterTagMetadata(); 
	tag.Id = tagSoftware; 
	tag.DataType = RasterTagMetadataDataType.Single; 
	float[] singleArray = new float[1]; 
	singleArray[0] = 4.53f; 
	tag.FromSingle(singleArray); 
	image.Tags.Add(tag); 
 
	// Double 
	tag = new RasterTagMetadata(); 
	tag.Id = tagSoftware; 
	tag.DataType = RasterTagMetadataDataType.Double; 
	double[] doubleArray = new double[1]; 
	doubleArray[0] = 7.1; 
	tag.FromDouble(doubleArray); 
	image.Tags.Add(tag); 
 
	// Rational 
	tag = new RasterTagMetadata(); 
	tag.Id = tagSoftware; 
	tag.DataType = RasterTagMetadataDataType.Rational; 
	RasterMetadataRational[] rational = new RasterMetadataRational[1]; 
	rational[0] = new RasterMetadataRational(); 
	rational[0].Numerator = 3; 
	rational[0].Denominator = 2; 
	tag.FromRational(rational); 
	image.Tags.Add(tag); 
 
	// URational 
	tag = new RasterTagMetadata(); 
	tag.Id = tagSoftware; 
	tag.DataType = RasterTagMetadataDataType.URational; 
	RasterMetadataURational[] urational = new RasterMetadataURational[1]; 
	urational[0] = new RasterMetadataURational(3, 2); 
	tag.FromURational(urational); 
	image.Tags.Add(tag); 
 
	// Save the image and its tags to the destination tiff file 
	codecs.Options.Save.Tags = true; 
	codecs.Save(image, destFileName, RasterImageFormat.Tif, 1); 
 
	// Enumerate the tags from the file 
	codecs.TagFound += new EventHandler<CodecsEnumTagsEventArgs>(codecs_TagFound); 
	codecs.EnumTags(destFileName, 1); 
 
	// clean up 
	image.Dispose(); 
	codecs.Dispose(); 
} 
 
void codecs_TagFound(object sender, CodecsEnumTagsEventArgs e) 
{ 
	Console.WriteLine("Found tag id = {0}, count = {1}, type = {2}", e.Id, e.Count, e.MetadataType); 
} 
 
static class LEAD_VARS 
{ 
   public const string ImagesDir = @"C:\LEADTOOLS21\Resources\Images"; 
}

Imports Leadtools 
Imports Leadtools.Codecs 
 
Public Sub RasterTagMetadataExample() 
   Dim codecs As RasterCodecs = New RasterCodecs() 
   codecs.ThrowExceptionsOnInvalidImages = True 
 
   Dim srcFileName As String = Path.Combine(LEAD_VARS.ImagesDir, "Image1.cmp") 
   Dim destFileName As String = Path.Combine(LEAD_VARS.ImagesDir, "Image1_tags.tif") 
 
   ' Load the image 
   Dim image As RasterImage = codecs.Load(srcFileName) 
 
   ' add the tags 
   Const tagSoftware As Integer = &H8001 
 
   Dim tag As RasterTagMetadata 
 
   ' Ascii 
   tag = New RasterTagMetadata() 
   tag.Id = tagSoftware 
   tag.DataType = RasterTagMetadataDataType.Ascii 
   tag.FromAscii("Test String") 
   image.Tags.Add(tag) 
 
   ' Byte 
   tag = New RasterTagMetadata() 
   tag.Id = tagSoftware 
   tag.DataType = RasterTagMetadataDataType.Byte 
   Dim byteArray As Byte() = New Byte(0) {} 
   byteArray(0) = 10 
   tag.FromByte(byteArray) 
   image.Tags.Add(tag) 
 
   ' SByte 
   tag = New RasterTagMetadata() 
   tag.Id = tagSoftware 
   tag.DataType = RasterTagMetadataDataType.SByte 
   Dim sbyteArray As SByte() = New SByte(0) {} 
   sbyteArray(0) = -45 
   tag.FromSByte(sbyteArray) 
   image.Tags.Add(tag) 
 
   ' Int16 
   tag = New RasterTagMetadata() 
   tag.Id = tagSoftware 
   tag.DataType = RasterTagMetadataDataType.Int16 
   Dim shortArray As Short() = New Short(0) {} 
   shortArray(0) = 64 
   tag.FromInt16(shortArray) 
   image.Tags.Add(tag) 
 
   ' Uint16 
   tag = New RasterTagMetadata() 
   tag.Id = tagSoftware 
   tag.DataType = RasterTagMetadataDataType.UInt16 
   Dim uint16Array As System.UInt16() = New System.UInt16(0) {} 
   uint16Array(0) = 50 
   tag.FromUInt16(uint16Array) 
   image.Tags.Add(tag) 
 
   ' Int32 
   tag = New RasterTagMetadata() 
   tag.Id = tagSoftware 
   tag.DataType = RasterTagMetadataDataType.Int32 
   Dim intArray As Integer() = New Integer(0) {} 
   intArray(0) = -1326 
   tag.FromInt32(intArray) 
   image.Tags.Add(tag) 
 
   ' Uint32 
   tag = New RasterTagMetadata() 
   tag.Id = tagSoftware 
   tag.DataType = RasterTagMetadataDataType.UInt32 
   Dim uintArray As System.UInt32() = New System.UInt32(0) {} 
   uintArray(0) = 1326 
   tag.FromUInt32(uintArray) 
   image.Tags.Add(tag) 
 
   ' single 
   tag = New RasterTagMetadata() 
   tag.Id = tagSoftware 
   tag.DataType = RasterTagMetadataDataType.Single 
   Dim singleArray As Single() = New Single(0) {} 
   singleArray(0) = 4.53F 
   tag.FromSingle(singleArray) 
   image.Tags.Add(tag) 
 
   ' Double 
   tag = New RasterTagMetadata() 
   tag.Id = tagSoftware 
   tag.DataType = RasterTagMetadataDataType.Double 
   Dim doubleArray As Double() = New Double(0) {} 
   doubleArray(0) = 7.1 
   tag.FromDouble(doubleArray) 
   image.Tags.Add(tag) 
 
   ' Rational 
   tag = New RasterTagMetadata() 
   tag.Id = tagSoftware 
   tag.DataType = RasterTagMetadataDataType.Rational 
   Dim rational As RasterMetadataRational() = New RasterMetadataRational(0) {} 
   rational(0) = New RasterMetadataRational() 
   rational(0).Numerator = 3 
   rational(0).Denominator = 2 
   tag.FromRational(rational) 
   image.Tags.Add(tag) 
 
   ' URational 
   tag = New RasterTagMetadata() 
   tag.Id = tagSoftware 
   tag.DataType = RasterTagMetadataDataType.URational 
   Dim urational As RasterMetadataURational() = New RasterMetadataURational(0) {} 
   urational(0) = New RasterMetadataURational(3, 2) 
   tag.FromURational(urational) 
   image.Tags.Add(tag) 
 
   ' Save the image and its tags to the destination tiff file 
   codecs.Options.Save.Tags = True 
   codecs.Save(image, destFileName, RasterImageFormat.Tif, 1) 
 
   ' Enumerate the tags from the file 
   AddHandler codecs.TagFound, AddressOf codecs_TagFound 
   codecs.EnumTags(destFileName, 1) 
 
   ' clean up 
   image.Dispose() 
End Sub 
 
Private Sub codecs_TagFound(ByVal sender As Object, ByVal e As CodecsEnumTagsEventArgs) 
   Console.WriteLine("Found tag id = {0}, count = {1}, type = {2}", e.Id, e.Count, e.MetadataType) 
End Sub 
 
Public NotInheritable Class LEAD_VARS 
   Public Const ImagesDir As String = "C:\LEADTOOLS21\Resources\Images" 
End Class

Requirements

Target Platforms

Reference

RasterTagMetadata Members

Leadtools Namespace

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