GDI+ - how can I deactivate antialiasing?

Michael Rettkowitz

16y18.9kGDI+

Hi,
if using the code below to fill an area on a bitmap...

 

Dim ImgBg As Bitmap = System.Drawing.Bitmap.FromFile(Filename1)
ImgBg.SetResolution(72, 72) 
Dim g As Graphics = Graphics.FromImage(ImgBg)
g.SmoothingMode = Drawing2D.SmoothingMode.None
Dim mybrush As Brush = Brushes.Beige
g.FillRectangle(mybrush, rect)
g.Dispose()
ImgBg.Save(Filename2)

also the pixels around the 'rect' area are manipulated, but they should remain, as they are.
The same effect I'm having, when inserting images using g.DrawImage(...), g.DrawImageUnscaled(...), g.DrawImageUnscaledAndClipped(...)
Does anyone know, how to prevent this?
Michael

1 Reply

Know the answer? Post it — somebody with the same question will find it here.

Ibrahim Ersoy15y ago
you can disable it by using:
g.SmoothingMode = SmoothingMode.None
Thats true.But in where are you using the codes above?
Did you refer to PaintEventArgs while creating your graphics object.
And one more thing "Dispose" it after you saved the image file.Maybe this can help