Brightness Effect

The Brightness effect can be used to lighten the image or to darken it.

The value given is added to every pixel in the image. The value may be negative in which case the result is to darken rather than lighten the image.

The following show the effect of brightening or darkening an image.

[C#]
void function() {
  using (Doc doc = new Doc()) {
    AddImagePage(doc, img2); // original image
    doc.Rendering.Save("EffectBrightness.jpg");
    using (ImageLayer layer = AddImagePage(doc, img2)) {
      using (EffectOperation effect = new EffectOperation("Brightness")) {
        effect.Parameters["Amount"].Value = 20;
        effect.Apply(layer.PixMap);
      }
    }
    doc.Rendering.Save("EffectBrightness20.jpg");
    using (ImageLayer layer = AddImagePage(doc, img2)) {
      using (EffectOperation effect = new EffectOperation("Brightness")) {
        effect.Parameters["Amount"].Value = -20;
        effect.Apply(layer.PixMap);
      }
    }
    doc.Rendering.Save("EffectBrightness-20.jpg");
    using (ImageLayer layer = AddImagePage(doc, img2)) {
      using (EffectOperation effect = new EffectOperation("Brightness")) {
        effect.Parameters["Amount"].Value = 60;
        effect.Apply(layer.PixMap);
      }
    }
    doc.Rendering.Save("EffectBrightness60.jpg");
  }
}

[Visual Basic]
Sub ...
  Using doc As New Doc()
    AddImagePage(doc, img2)
    ' original image
    doc.Rendering.Save("EffectBrightness.jpg")
    Using layer As ImageLayer = AddImagePage(doc, img2)
      Using effect As New EffectOperation("Brightness")
        effect.Parameters("Amount").Value = 20
        effect.Apply(layer.PixMap)
      End Using
    End Using
    doc.Rendering.Save("EffectBrightness20.jpg")
    Using layer As ImageLayer = AddImagePage(doc, img2)
      Using effect As New EffectOperation("Brightness")
        effect.Parameters("Amount").Value = -20
        effect.Apply(layer.PixMap)
      End Using
    End Using
    doc.Rendering.Save("EffectBrightness-20.jpg")
    Using layer As ImageLayer = AddImagePage(doc, img2)
      Using effect As New EffectOperation("Brightness")
        effect.Parameters("Amount").Value = 60
        effect.Apply(layer.PixMap)
      End Using
    End Using
    doc.Rendering.Save("EffectBrightness60.jpg")
  End Using
End Sub