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:


测试代码:

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;