GammaInfo Property

Helper property to get the range, default value, and other information for the Gamma property.

Syntax

Visual Basic
C#
C++/CLI

'Declaration
 
Public ReadOnly Property GammaInfo As VideoProcAmpInfo

'Usage
 
Dim instance As VideoProcAmp
Dim value As VideoProcAmpInfo
 
value = instance.GammaInfo

public VideoProcAmpInfo GammaInfo {get;}

public:
property VideoProcAmpInfo^ GammaInfo {
   VideoProcAmpInfo^ get();
}

Property Value

A VideoProcAmpInfo object.

Remarks

The information returned for this property is a VideoProcAmpInfo object containing all the related property information.

Example

Visual Basic
C#
WinRT C#
WinRT JavaScript
Silverlight C#
Silverlight VB

Copy Code

Imports Leadtools
Imports Leadtools.Multimedia
Imports LeadtoolsMultimediaExamples.Fixtures

Public _result As Boolean = False
Public _form As CaptureCtrlForm = New CaptureCtrlForm()
Public _videoprocamp As VideoProcAmp
Public _outFile As String = Path.Combine(LEAD_VARS.MediaDir, "VideoProcAmp_SetAutoValueExample.avi")
' this example demonstrates how to set an auto value on the
' video proc amp object.

Public Sub SetManualValueExample()
   ' reference the capture control
   Dim capturectrl As CaptureCtrl = _form.CaptureCtrl

   Try
      ' select the first device with analog in it's name
      ' Replace "Analog" with your video capture device name
      If capturectrl.VideoDevices("Logitech") Is Nothing Then
         Throw New Exception("No Logitech video devices available!")
      End If

      capturectrl.VideoDevices("Logitech").Selected = True

      ' set a video compressor
      capturectrl.VideoCompressors.Mpeg2.Selected = True

      ' set the target file
      capturectrl.TargetFile = _outFile

      ' reference the video proc amp
      _videoprocamp = capturectrl.VideoProcAmp

      ' try to set the auto value
      If Not _videoprocamp Is Nothing Then
         ' set the saturation to the maximum supported value
         _videoprocamp.Saturation = _videoprocamp.SaturationInfo.Max

         ' set the sharpness to the minimum value
         _videoprocamp.Sharpness = _videoprocamp.SharpnessInfo.Min

         ' set the white balace to the maximum value
         _videoprocamp.WhiteBalance = _videoprocamp.WhiteBalanceInfo.Max

         ' set the hue to the minimum value
         ' later in the timer we will bump this value using the stepDelta
         _videoprocamp.Hue = _videoprocamp.HueInfo.Min

         ' subscribe to the capture progress event 
         ' so we can play with the hue setting above
         AddHandler capturectrl.Progress, AddressOf CaptureCtrl_Progress
      End If

      ' check for video capture available
      If capturectrl.IsModeAvailable(CaptureMode.Video) Then
         ' capture 15 seconds of video
         capturectrl.UseTimeLimit = True
         capturectrl.TimeLimit = 15

         ' subscribe to the compete event
         AddHandler capturectrl.Complete, AddressOf CaptureCtrl_Complete
         ' start the capture
         capturectrl.StartCapture(CaptureMode.Video)
      End If
   Catch e1 As Exception
      _result = False
   End Try

   ' we'll loop on the state and pump messages for this example.
   ' but you should not need to if running from a Windows Forms application.
   Do While capturectrl.State = CaptureState.Running
      Application.DoEvents()
   Loop
End Sub

Private Sub CaptureCtrl_Progress(ByVal sender As Object, ByVal e As ProgressEventArgs)
   If Not _videoprocamp Is Nothing Then
      ' roll the hue value around while capturing
      _videoprocamp.Hue += _videoprocamp.HueInfo.StepDelta

      ' reset it to the minimum if we reach the max
      If _videoprocamp.Hue >= _videoprocamp.HueInfo.Max Then
         _videoprocamp.Hue = _videoprocamp.HueInfo.Min
      End If
   End If
End Sub

Private Sub CaptureCtrl_Complete(ByVal sender As Object, ByVal e As EventArgs)
   ' set the result to what we expect
   _result = File.Exists(_outFile)
End Sub

Public NotInheritable Class LEAD_VARS
Public Const MediaDir As String = "C:\Program Files (x86)\LEAD Technologies\LEADTOOLS 18\Media"
End Class

using Leadtools;
using Leadtools.Multimedia;
using LeadtoolsMultimediaExamples.Fixtures;

public bool _result = false;
public CaptureCtrlForm _form = new CaptureCtrlForm();
public VideoProcAmp _videoprocamp;
public string _outFile = Path.Combine(LEAD_VARS.MediaDir, "VideoProcAmp_SetAutoValueExample.avi");
// this example demonstrates how to set an auto value on the
// video proc amp object.

public void SetManualValueExample()
{
   // reference the capture control
   CaptureCtrl capturectrl = _form.CaptureCtrl;

   try
   {
      // select the first device with analog in it's name
      // Replace "Analog" with your video capture device name
      if (capturectrl.VideoDevices["Logitech"] == null)
         throw new Exception("No Logitech video devices available!");

      capturectrl.VideoDevices["Logitech"].Selected = true;

      // set a video compressor
      capturectrl.VideoCompressors.Mpeg2.Selected = true;

      // set the target file
      capturectrl.TargetFile = _outFile;

      // reference the video proc amp
      _videoprocamp = capturectrl.VideoProcAmp;

      // try to set the auto value
      if (_videoprocamp != null)
      {
         // set the saturation to the maximum supported value
         _videoprocamp.Saturation = _videoprocamp.SaturationInfo.Max;

         // set the sharpness to the minimum value
         _videoprocamp.Sharpness = _videoprocamp.SharpnessInfo.Min;

         // set the white balace to the maximum value
         _videoprocamp.WhiteBalance = _videoprocamp.WhiteBalanceInfo.Max;

         // set the hue to the minimum value
         // later in the timer we will bump this value using the stepDelta
         _videoprocamp.Hue = _videoprocamp.HueInfo.Min;

         // subscribe to the capture progress event 
         // so we can play with the hue setting above
         capturectrl.Progress += new ProgressEventHandler(CaptureCtrl_Progress);
      }

      // check for video capture available
      if (capturectrl.IsModeAvailable(CaptureMode.Video))
      {
         // capture 15 seconds of video
         capturectrl.UseTimeLimit = true;
         capturectrl.TimeLimit = 15;

         // subscribe to the compete event
         capturectrl.Complete += new EventHandler(CaptureCtrl_Complete);
         // start the capture
         capturectrl.StartCapture(CaptureMode.Video);
      }
   }
   catch (Exception)
   {
      _result = false;
   }

   // we'll loop on the state and pump messages for this example.
   // but you should not need to if running from a Windows Forms application.
   while (capturectrl.State == CaptureState.Running)
      Application.DoEvents();
}

void CaptureCtrl_Progress(object sender, ProgressEventArgs e)
{
   if (_videoprocamp != null)
   {
      // roll the hue value around while capturing
      _videoprocamp.Hue += _videoprocamp.HueInfo.StepDelta;

      // reset it to the minimum if we reach the max
      if (_videoprocamp.Hue >= _videoprocamp.HueInfo.Max)
         _videoprocamp.Hue = _videoprocamp.HueInfo.Min;
   }
}

void CaptureCtrl_Complete(object sender, EventArgs e)
{
   // set the result to what we expect
   _result = File.Exists(_outFile);
}

static class LEAD_VARS
{
public const string MediaDir = @"C:\Program Files (x86)\LEAD Technologies\LEADTOOLS 18\Media";
}

Requirements

Target Platforms

Reference

VideoProcAmp Class
VideoProcAmp Members