Error processing SSI file
LEADTOOLS (Leadtools assembly)
Show in webframe

PaintGamma Property








Leadtools Namespace > RasterImage Class : PaintGamma Property
Gets or sets the current gamma correction value for the image.
Syntax
public int PaintGamma {get; set;}
'Declaration
 

Public Property PaintGamma As Integer
'Usage
 

Dim instance As RasterImage
Dim value As Integer
 
instance.PaintGamma = value
 
value = instance.PaintGamma
public int PaintGamma {get; set;}
@property (nonatomic, assign) NSUInteger paintGamma
public int getPaintGamma()
public void setPaintGamma(int value)
            
 <br/>get_PaintGamma();<br/>set_PaintGamma(value);<br/>Object.defineProperty('PaintGamma'); 
public:
property int PaintGamma {
   int get();
   void set (    int value);
}

Property Value

The current gamma correction value.
Remarks

The paint gamma value can be any number greater than 0. The default value is 100.

Because this is an unsigned integer, it is 100 times the actual gamma value. For example, use 235 to set a gamma value of 2.35. Intensity values ideally follow a logarithmic progression, because the eye perceives changes in intensity as being equal when the ratio of change is equal. For example, we would see a change from 0.1 to 0.2 as being equal to a change from 0.2 to 0.4.

Gamma is a standard constant that is used to calculate the progression. For most CRTs the gamma constant is in the range of 2.2 to 2.5.

For more information, refer to Changing Brightness and Contrast.

Example
Copy Code   
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 IntensityExample()
   Dim f As IntensityForm = New IntensityForm()
   f.ShowDialog()
End Sub
Private Class IntensityForm : Inherits Form
   Private viewer As ImageViewer
   Private gammaTrackBar As TrackBar
   Private contrastTrackBar As TrackBar
   Private intensityTrackBar As TrackBar

   Public Sub New()
      ' Create the controls
      Size = New Size(800, 600)
      Dim controlsPanel As Panel = New Panel()
      controlsPanel.Size = New Size(400, 0)
      controlsPanel.BorderStyle = BorderStyle.Fixed3D
      controlsPanel.Dock = DockStyle.Left

      Dim labelLeft As Integer = 8
      Dim y As Integer = 16
      Dim trackBarLeft As Integer = 100

      Dim gammaLabel As Label = New Label()
      gammaLabel.Text = "Gamma:"
      gammaLabel.Location = New Point(labelLeft, y)
      gammaLabel.AutoSize = True
      controlsPanel.Controls.Add(gammaLabel)

      gammaTrackBar = New TrackBar()
      gammaTrackBar.Minimum = 1
      gammaTrackBar.Maximum = 100
      gammaTrackBar.TickFrequency = (gammaTrackBar.Maximum - gammaTrackBar.Minimum) \ 10
      gammaTrackBar.Location = New Point(trackBarLeft, y)
      gammaTrackBar.Width = 200
      AddHandler gammaTrackBar.Scroll, AddressOf gammaTrackBar_Scroll
      controlsPanel.Controls.Add(gammaTrackBar)
      gammaLabel.Top = gammaTrackBar.Top + (gammaTrackBar.Height - gammaLabel.Height) \ 2
      y = gammaTrackBar.Bottom + 8

      Dim contrastLabel As Label = New Label()
      contrastLabel.Text = "Contrast:"
      contrastLabel.Location = New Point(labelLeft, y)
      contrastLabel.AutoSize = True
      controlsPanel.Controls.Add(contrastLabel)

      contrastTrackBar = New TrackBar()
      contrastTrackBar.Minimum = -1000
      contrastTrackBar.Maximum = 1000
      contrastTrackBar.TickFrequency = (contrastTrackBar.Maximum - contrastTrackBar.Minimum) \ 10
      contrastTrackBar.Location = New Point(trackBarLeft, y)
      contrastTrackBar.Width = 200
      AddHandler contrastTrackBar.Scroll, AddressOf contrastTrackBar_Scroll
      controlsPanel.Controls.Add(contrastTrackBar)
      contrastLabel.Top = contrastTrackBar.Top + (contrastTrackBar.Height - contrastLabel.Height) \ 2
      y = contrastTrackBar.Bottom + 8

      Dim intensityLabel As Label = New Label()
      intensityLabel.Text = "Intensity:"
      intensityLabel.Location = New Point(labelLeft, y)
      intensityLabel.AutoSize = True
      controlsPanel.Controls.Add(intensityLabel)
      y = intensityLabel.Bottom + 8

      intensityTrackBar = New TrackBar()
      intensityTrackBar.Minimum = -1000
      intensityTrackBar.Maximum = 1000
      intensityTrackBar.TickFrequency = (intensityTrackBar.Maximum - intensityTrackBar.Minimum) \ 10
      intensityTrackBar.Location = New Point(trackBarLeft, y)
      intensityTrackBar.Width = 200
      AddHandler intensityTrackBar.Scroll, AddressOf intensityTrackBar_Scroll
      controlsPanel.Controls.Add(intensityTrackBar)
      intensityLabel.Top = intensityTrackBar.Top + (intensityTrackBar.Height - intensityLabel.Height) \ 2
      y = intensityTrackBar.Bottom + 8

      Dim defaultButton As Button = New Button()
      defaultButton.Text = "Default"
      defaultButton.Location = New Point(labelLeft, y)
      AddHandler defaultButton.Click, AddressOf defaultButton_Click
      controlsPanel.Controls.Add(defaultButton)

      Controls.Add(controlsPanel)

      viewer = New ImageViewer()
      viewer.Dock = DockStyle.Fill
      Controls.Add(viewer)
      viewer.BringToFront()

      ' Load the image
      Using codecs As RasterCodecs = New RasterCodecs()

         Dim srcFileName As String = Path.Combine(LEAD_VARS.ImagesDir, "Image1.cmp")
         viewer.Image = codecs.Load(srcFileName)

      End Using

      gammaTrackBar.Value = viewer.Image.PaintGamma
      contrastTrackBar.Value = viewer.Image.PaintContrast
      intensityTrackBar.Value = viewer.Image.PaintIntensity
      UpdateValues()
   End Sub

   Private Sub UpdateValues()
      Dim str As String = String.Format("Gamma = {0}, Contrast = {1}, Intensity = {2}", viewer.Image.PaintGamma, viewer.Image.PaintContrast, viewer.Image.PaintIntensity)
      Text = str
   End Sub

   Private Sub gammaTrackBar_Scroll(ByVal sender As Object, ByVal e As EventArgs)
      Dim tb As TrackBar = CType(IIf(TypeOf sender Is TrackBar, sender, Nothing), TrackBar)
      viewer.Image.PaintGamma = tb.Value
      UpdateValues()
   End Sub

   Private Sub contrastTrackBar_Scroll(ByVal sender As Object, ByVal e As EventArgs)
      Dim tb As TrackBar = CType(IIf(TypeOf sender Is TrackBar, sender, Nothing), TrackBar)
      viewer.Image.PaintContrast = tb.Value
      UpdateValues()
   End Sub

   Private Sub intensityTrackBar_Scroll(ByVal sender As Object, ByVal e As EventArgs)
      Dim tb As TrackBar = CType(IIf(TypeOf sender Is TrackBar, sender, Nothing), TrackBar)
      viewer.Image.PaintIntensity = tb.Value
      UpdateValues()
   End Sub

   Private Sub defaultButton_Click(ByVal sender As Object, ByVal e As EventArgs)
      viewer.Image.PaintGamma = 100
      viewer.Image.PaintIntensity = 0
      viewer.Image.PaintContrast = 0

      gammaTrackBar.Value = viewer.Image.PaintGamma
      contrastTrackBar.Value = viewer.Image.PaintContrast
      intensityTrackBar.Value = viewer.Image.PaintIntensity

      UpdateValues()
   End Sub
End Class

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 IntensityExample()
{
   IntensityForm f = new IntensityForm();
   f.ShowDialog();
}
class IntensityForm : Form
{
   ImageViewer viewer;
   TrackBar gammaTrackBar;
   TrackBar contrastTrackBar;
   TrackBar intensityTrackBar;

   public IntensityForm()
   {
      // Create the controls
      Size = new Size(800, 600);
      Panel controlsPanel = new Panel();
      controlsPanel.Size = new Size(400, 0);
      controlsPanel.BorderStyle = BorderStyle.Fixed3D;
      controlsPanel.Dock = DockStyle.Left;

      int labelLeft = 8;
      int y = 16;
      int trackBarLeft = 100;

      Label gammaLabel = new Label();
      gammaLabel.Text = "Gamma:";
      gammaLabel.Location = new Point(labelLeft, y);
      gammaLabel.AutoSize = true;
      controlsPanel.Controls.Add(gammaLabel);

      gammaTrackBar = new TrackBar();
      gammaTrackBar.Minimum = 1;
      gammaTrackBar.Maximum = 100;
      gammaTrackBar.TickFrequency = (gammaTrackBar.Maximum - gammaTrackBar.Minimum) / 10;
      gammaTrackBar.Location = new Point(trackBarLeft, y);
      gammaTrackBar.Width = 200;
      gammaTrackBar.Scroll += new EventHandler(gammaTrackBar_Scroll);
      controlsPanel.Controls.Add(gammaTrackBar);
      gammaLabel.Top = gammaTrackBar.Top + (gammaTrackBar.Height - gammaLabel.Height) / 2;
      y = gammaTrackBar.Bottom + 8;

      Label contrastLabel = new Label();
      contrastLabel.Text = "Contrast:";
      contrastLabel.Location = new Point(labelLeft, y);
      contrastLabel.AutoSize = true;
      controlsPanel.Controls.Add(contrastLabel);

      contrastTrackBar = new TrackBar();
      contrastTrackBar.Minimum = -1000;
      contrastTrackBar.Maximum = 1000;
      contrastTrackBar.TickFrequency = (contrastTrackBar.Maximum - contrastTrackBar.Minimum) / 10;
      contrastTrackBar.Location = new Point(trackBarLeft, y);
      contrastTrackBar.Width = 200;
      contrastTrackBar.Scroll += new EventHandler(contrastTrackBar_Scroll);
      controlsPanel.Controls.Add(contrastTrackBar);
      contrastLabel.Top = contrastTrackBar.Top + (contrastTrackBar.Height - contrastLabel.Height) / 2;
      y = contrastTrackBar.Bottom + 8;

      Label intensityLabel = new Label();
      intensityLabel.Text = "Intensity:";
      intensityLabel.Location = new Point(labelLeft, y);
      intensityLabel.AutoSize = true;
      controlsPanel.Controls.Add(intensityLabel);
      y = intensityLabel.Bottom + 8;

      intensityTrackBar = new TrackBar();
      intensityTrackBar.Minimum = -1000;
      intensityTrackBar.Maximum = 1000;
      intensityTrackBar.TickFrequency = (intensityTrackBar.Maximum - intensityTrackBar.Minimum) / 10;
      intensityTrackBar.Location = new Point(trackBarLeft, y);
      intensityTrackBar.Width = 200;
      intensityTrackBar.Scroll += new EventHandler(intensityTrackBar_Scroll);
      controlsPanel.Controls.Add(intensityTrackBar);
      intensityLabel.Top = intensityTrackBar.Top + (intensityTrackBar.Height - intensityLabel.Height) / 2;
      y = intensityTrackBar.Bottom + 8;

      Button defaultButton = new Button();
      defaultButton.Text = "Default";
      defaultButton.Location = new Point(labelLeft, y);
      defaultButton.Click += new EventHandler(defaultButton_Click);
      controlsPanel.Controls.Add(defaultButton);

      Controls.Add(controlsPanel);

      viewer = new ImageViewer();
      viewer.Dock = DockStyle.Fill;
      Controls.Add(viewer);
      viewer.BringToFront();

      // Load the image
      using (RasterCodecs codecs = new RasterCodecs())
      {
         string srcFileName = Path.Combine(ImagesPath.Path, "Image1.cmp");
         viewer.Image = codecs.Load(srcFileName);
      }

      gammaTrackBar.Value = viewer.Image.PaintGamma;
      contrastTrackBar.Value = viewer.Image.PaintContrast;
      intensityTrackBar.Value = viewer.Image.PaintIntensity;
      UpdateValues();
   }

   void UpdateValues()
   {
      string str = string.Format(
         "Gamma = {0}, Contrast = {1}, Intensity = {2}",
         viewer.Image.PaintGamma, viewer.Image.PaintContrast, viewer.Image.PaintIntensity);
      Text = str;
   }

   void gammaTrackBar_Scroll(object sender, EventArgs e)
   {
      TrackBar tb = sender as TrackBar;
      viewer.Image.PaintGamma = tb.Value;
      UpdateValues();
   }

   void contrastTrackBar_Scroll(object sender, EventArgs e)
   {
      TrackBar tb = sender as TrackBar;
      viewer.Image.PaintContrast = tb.Value;
      UpdateValues();
   }

   void intensityTrackBar_Scroll(object sender, EventArgs e)
   {
      TrackBar tb = sender as TrackBar;
      viewer.Image.PaintIntensity = tb.Value;
      UpdateValues();
   }

   void defaultButton_Click(object sender, EventArgs e)
   {
      viewer.Image.PaintGamma = 100;
      viewer.Image.PaintIntensity = 0;
      viewer.Image.PaintContrast = 0;

      gammaTrackBar.Value = viewer.Image.PaintGamma;
      contrastTrackBar.Value = viewer.Image.PaintContrast;
      intensityTrackBar.Value = viewer.Image.PaintIntensity;

      UpdateValues();
   }
}
Requirements

Target Platforms

See Also

Reference

RasterImage Class
RasterImage Members

Error processing SSI file