Vista Tutorial - Rendering bitmap is Blurry in WPF

pym · 12-14-2008

Hello,

I am trying to convert some vector based objects into a raster bitmap.
I manage to do that, but the result is blurry, meaning, edges are blurry instead of jagged.
I assume an anti-aliasing algorithm is applied, but I do not want to be applied...

here is my simplified code in which I draw a circle and make a raster out of it to an Image Control:

Code:

DrawingVisual drawingVisual = new DrawingVisual();
DrawingContext drawingContext = drawingVisual.RenderOpen();
drawingContext.DrawEllipse(Brushes.Red, new Pen(Brushes.Red, 1), new Point(50, 50), 50, 50);
drawingContext.Close();

RenderTargetBitmap bmp = new RenderTargetBitmap(180, 180, 96, 96, PixelFormats.Pbgra32);
bmp.Render(drawingVisual);

RenderOptions.SetEdgeMode(_image, EdgeMode.Aliased);
_image.Source = bmp;

Here is an image to make it clearer.
What I want is the jagged edged circle...
ImageShack - Image Hosting :: 98299814ew8.png

Does anyone have any idea why this happens???
Thanks!

12-14-2008	#1 (permalink)
pym Newbie Join Date: Dec 2008 Vista Home Premium 32bit. 1 posts	Rendering bitmap is Blurry in WPF Hello, I am trying to convert some vector based objects into a raster bitmap. I manage to do that, but the result is blurry, meaning, edges are blurry instead of jagged. I assume an anti-aliasing algorithm is applied, but I do not want to be applied... here is my simplified code in which I draw a circle and make a raster out of it to an Image Control: Code: DrawingVisual drawingVisual = new DrawingVisual(); DrawingContext drawingContext = drawingVisual.RenderOpen(); drawingContext.DrawEllipse(Brushes.Red, new Pen(Brushes.Red, 1), new Point(50, 50), 50, 50); drawingContext.Close(); RenderTargetBitmap bmp = new RenderTargetBitmap(180, 180, 96, 96, PixelFormats.Pbgra32); bmp.Render(drawingVisual); RenderOptions.SetEdgeMode(_image, EdgeMode.Aliased); _image.Source = bmp; Here is an image to make it clearer. What I want is the jagged edged circle... ImageShack - Image Hosting :: 98299814ew8.png Does anyone have any idea why this happens??? Thanks!
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