Undesired anti-aliasing when drawing bitmap on a window

Question

I\'m rendering an image into a System.Drawing.Bitmap and subsequently drawing it into a window, however I can see that the edges are being anti-aliased. How do prevent this?

Answer 1

Set the InterpolationMode property to NearestNeighbor and PixelOffsetMode to None.

pea.Graphics.InterpolationMode = InterpolationMode.NearestNeighbor;
pea.Graphics.PixelOffsetMode = PixelOffsetMode.None; // or PixelOffsetMode.Half

Drawing the bitmap unscaled is best. In which case you probably want to use the ClientSize.Width and Height properties to initialize the bitmap. Odds are good that you are making the bitmap too large right now by including the form's border and caption. I can't tell from the snippet.