Markers Property

public RasterCollection<RasterMarkerMetadata> Markers {get;}

public RasterCollection<RasterMarkerMetadata> Markers {get;}

@property (nonatomic, assign, readonly, nullable) NSMutableArray<LTRasterMarkerMetadata *> *markers

public RasterCollection<RasterMarkerMetadata> getMarkers()

 get_Markers();

public:
property RasterCollection<RasterMarkerMetadata^>^ Markers {
   RasterCollection<RasterMarkerMetadata^>^ get();
}

'Declaration

Public ReadOnly Property Markers As RasterCollection(Of RasterMarkerMetadata)

'Usage

Dim instance As RasterImage
Dim value As RasterCollection(Of RasterMarkerMetadata)
 
value = instance.Markers

Property Value

A collection of RasterMarkerMetadata used when reading and writing certain file formats (including JPEG).

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

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

By setting the CodecsSaveOptions.Markers property to true before calling RasterCodecs.Save, you can save the markers 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.ReadMarkers method to load the markers directly from an existing file and the RasterCodecs.WriteMarkers method to save the markers to an existing file.

For more information, refer to Non Image Data.

Imports Leadtools
Imports Leadtools.Codecs
Imports Leadtools.ImageProcessing
Imports Leadtools.ImageProcessing.Core
Imports Leadtools.ImageProcessing.Color
Imports Leadtools.Controls
Imports Leadtools.Dicom
Imports Leadtools.Drawing
Imports Leadtools.Svg

      
Public Sub MarkersExample()
   Dim codecs As RasterCodecs = New RasterCodecs()
   Dim image As RasterImage = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "IMAGE1.CMP"))
   Dim byteData As Byte() = New Byte(0) {}
   byteData(0) = 40
   ' write APP5 (since nobody writes that)
   Dim markerData As RasterMarkerMetadata = New RasterMarkerMetadata(RasterMarkerMetadata.App0 + 5, byteData)
   image.Markers.Add(markerData)

   codecs.Options.Save.Markers = True
   codecs.Save(image, Path.Combine(LEAD_VARS.ImagesDir, "IMAGE1_MARKERS.JPG"), RasterImageFormat.Jpeg, 0)

   ' load the marker together with the image
   Dim marker As RasterCollection(Of RasterMarkerMetadata) = codecs.ReadMarkers(Path.Combine(LEAD_VARS.ImagesDir, "IMAGE1_MARKERS.JPG"))
   ' look for the APP5 marker, because there might be other markers (like APP0, APP1)
   For Each markerItem As RasterMarkerMetadata In marker
      If markerItem.Id = RasterMarkerMetadata.App0 + 5 Then
         MessageBox.Show("marker Id :" & markerItem.Id.ToString() & " = " & markerItem.GetData().ToString())
      End If
   Next markerItem

   codecs.Dispose()
End Sub

Public NotInheritable Class LEAD_VARS
Public Const ImagesDir As String = "C:\Users\Public\Documents\LEADTOOLS Images"
End Class

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 MarkersExample()
{
   RasterCodecs codecs = new RasterCodecs();
   RasterImage image = codecs.Load(Path.Combine(ImagesPath.Path,"IMAGE1.CMP"));
   byte[] byteData = new byte[1];
   byteData[0] = 40;
   // write APP5 (since nobody writes that)
   RasterMarkerMetadata markerData = new RasterMarkerMetadata(RasterMarkerMetadata.App0 + 5, byteData);
   image.Markers.Add(markerData);

   codecs.Options.Save.Markers = true;
   codecs.Save(image, Path.Combine(ImagesPath.Path, "IMAGE1_MARKERS.JPG"), RasterImageFormat.Jpeg, 0);

   // load the marker together with the image
   RasterCollection<RasterMarkerMetadata> marker = codecs.ReadMarkers(Path.Combine(ImagesPath.Path,"IMAGE1_MARKERS.JPG"));
   // look for the APP5 marker, because there might be other markers (like APP0, APP1)
   foreach(RasterMarkerMetadata markerItem in marker)
      if(markerItem.Id == RasterMarkerMetadata.App0 + 5)
         MessageBox.Show("marker Id :" + markerItem.Id.ToString() + " = " + markerItem.GetData().ToString());

   codecs.Dispose();
}

RasterImageExamples.prototype.MarkersExample = function () {
   Tools.SetLicense();
   with (Leadtools) {
      with (Leadtools.Codecs) {
         var codecs = new RasterCodecs();
         var srcFileName = "Assets\\Image1.cmp";
         var image;

         return Tools.AppInstallFolder().getFileAsync(srcFileName).then(function (loadFile) {

            return codecs.loadAsync(LeadStreamFactory.create(loadFile))
         })
            .then(function (img) {
               image = img;

               var byteData = new Array(1);
               byteData[0] = 40;
               // write APP5 (since nobody writes that)
               var markerData = new RasterMarkerMetadata(RasterMarkerMetadata.app0 + 5, byteData);
               image.markers.append(markerData);

               codecs.options.save.markers = true;
               return Tools.AppLocalFolder().createFileAsync("IMAGE1_MARKERS.JPG")
            })
            .then(function (saveFile) {
               var saveStream = LeadStreamFactory.create(saveFile);
               return codecs.saveAsync(image, saveStream, RasterImageFormat.jpeg, 0)
            })
            .then(function () {
               // load the marker together with the image
               return Tools.AppLocalFolder().getFileAsync("IMAGE1_MARKERS.JPG")
            })
            .then(function (loadFile) {
               return codecs.readMarkersAsync(LeadStreamFactory.create(loadFile))
            })
            .then(function (marker) {
               // look for the APP5 marker, because there might be other markers (like APP0, APP1)
               for (var i = 0; i < marker.length; i++) {
                  var markerItem = marker[i];

                  if (markerItem.id == RasterMarkerMetadata.app0 + 5)
                     console.info("marker Id :" + markerItem.id + " Length : " + markerItem.getData().length);
               }
               image.close();
               codecs.close();
            });
      }
   }
}

using Leadtools;
using Leadtools.Codecs;
using Leadtools.ImageProcessing;
using Leadtools.ImageProcessing.Core;
using Leadtools.ImageProcessing.Color;
using Leadtools.Dicom;

      
public async Task MarkersExample()
{
   RasterCodecs codecs = new RasterCodecs();
   string srcFileName = @"Assets\Image1.cmp";
   StorageFile loadFile = await Tools.AppInstallFolder.GetFileAsync(srcFileName);
   RasterImage image = await codecs.LoadAsync(LeadStreamFactory.Create(loadFile));
   byte[] byteData = new byte[1];
   byteData[0] = 40;
   // write APP5 (since nobody writes that)
   RasterMarkerMetadata markerData = new RasterMarkerMetadata(RasterMarkerMetadata.App0 + 5, byteData);
   image.Markers.Add(markerData);

   codecs.Options.Save.Markers = true;
   StorageFile saveFile = await Tools.AppLocalFolder.CreateFileAsync("IMAGE1_MARKERS.JPG");
   ILeadStream saveStream = LeadStreamFactory.Create(saveFile);
   await codecs.SaveAsync(image, saveStream, RasterImageFormat.Jpeg, 0);

   // load the marker together with the image
   loadFile = await Tools.AppLocalFolder.GetFileAsync("IMAGE1_MARKERS.JPG");
   IList<RasterMarkerMetadata> marker = await codecs.ReadMarkersAsync(LeadStreamFactory.Create(loadFile));
   // look for the APP5 marker, because there might be other markers (like APP0, APP1)
   foreach (RasterMarkerMetadata markerItem in marker)
   {
      if (markerItem.Id == RasterMarkerMetadata.App0 + 5)
         Debug.WriteLine("marker Id :" + markerItem.Id + " Length : " + markerItem.GetData().Length);
   }

   codecs.Dispose();
}

using Leadtools;
using Leadtools.Codecs;
using Leadtools.Dicom;
using Leadtools.ImageProcessing;
using Leadtools.ImageProcessing.Core;
using Leadtools.ImageProcessing.Color;
using Leadtools.Examples;
using Leadtools.Windows.Media;

public void MarkersExample(RasterImage image, Stream destStream)
{
   byte[] byteData = new byte[1];
   byteData[0] = 40;
   // write APP5 (since nobody writes that)
   RasterMarkerMetadata markerData = new RasterMarkerMetadata(RasterMarkerMetadata.App0 + 5, byteData);
   image.Markers.Add(markerData);
   RasterCodecs codecs = new RasterCodecs();
   codecs.Options.Save.Markers = true;
   codecs.Save(image, destStream, RasterImageFormat.Jpeg, 0);

   // load the marker together with the image
   RasterCollection<RasterMarkerMetadata> marker = codecs.ReadMarkers(destStream);
   // look for the APP5 marker, because there might be other markers (like APP0, APP1)
   foreach (RasterMarkerMetadata markerItem in marker)
      if (markerItem.Id == RasterMarkerMetadata.App0 + 5)
         Debug.WriteLine("marker Id :" + markerItem.Id.ToString() + " = " + markerItem.GetData().ToString());
}

Imports Leadtools
Imports Leadtools.Codecs
Imports Leadtools.Dicom
Imports Leadtools.ImageProcessing
Imports Leadtools.ImageProcessing.Core
Imports Leadtools.ImageProcessing.Color
Imports Leadtools.Windows.Media

Public Sub MarkersExample(ByVal image As RasterImage, ByVal destStream As Stream)
   Dim byteData As Byte() = New Byte(0){}
   byteData(0) = 40
   ' write APP5 (since nobody writes that)
   Dim markerData As RasterMarkerMetadata = New RasterMarkerMetadata(RasterMarkerMetadata.App0 + 5, byteData)
   image.Markers.Add(markerData)
   Dim codecs As RasterCodecs = New RasterCodecs()
   codecs.Options.Save.Markers = True
   codecs.Save(image, destStream, RasterImageFormat.Jpeg, 0)

   ' load the marker together with the image
   Dim marker As RasterCollection(Of RasterMarkerMetadata) = codecs.ReadMarkers(destStream)
   ' look for the APP5 marker, because there might be other markers (like APP0, APP1)
   For Each markerItem As RasterMarkerMetadata In marker
      If markerItem.Id = RasterMarkerMetadata.App0 + 5 Then
         Debug.WriteLine("marker Id :" & markerItem.Id.ToString() & " = " & markerItem.GetData().ToString())
      End If
   Next markerItem
End Sub

Target Platforms

Reference

RasterImage Class
RasterImage Members