GdiPlus[15]: IGPLinearGradientBrush 之 GammaCorrection

GammaCorrection 属性是一个 Boolean 值, 默认 False; 为 True 表示启用了灰度校正.

测试图中的第二个图形使用了灰度校正:

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测试代码:

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uses GdiPlus;



procedure TForm1.FormPaint(Sender: TObject);

var

  Graphics: IGPGraphics;

  Rect: TGPRectF;

  Brush: IGPLinearGradientBrush;

begin

  Graphics := TGPGraphics.Create(Canvas.Handle);

  Rect.Initialize(20, 10, 150, 200);

  Brush := TGPLinearGradientBrush.Create(Rect, $FFFF0000, $FF0000FF, 0);



  Graphics.FillEllipse(Brush, Rect);



  Brush.GammaCorrection := True;



  Graphics.TranslateTransform(Rect.X + Rect.Width, 0);

  Graphics.FillEllipse(Brush, Rect);

end;