Draw Anti-Aliased Text Image like Graphics Software

I would like to generate text images like the following (source: http://www.zune.开发者_Python百科net/en-US):

The text has a nice thickness and is perfectly anti-aliased. Vector graphics software – such as Inkscape – produces the same result. However, the images I managed to create using GDI+ look like this:

These rendered text is too thin although the font family, size, weight etc. are identical. How can I increase the thickness of the text? Does WPF provide functionality to render the text as described above?

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[Update] I created the following images using TextRenderer.DrawText(). The first one uses TextRenderingHint.ClearTypeGridFit, the second one TextRenderingHint.AntiAlias:

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I managed to create nice-looking text images by rendering a WPF User Control containing a TextBlock inside a Canvas to a RenderTargetBitmap that – using a PngBitmapEncoder – is saved to a MemoryStream and turned to an image using Image.FromStream(Stream).