Disable Image blending on a PictureBox

Question

In my Windows Forms program, I have a PictureBox. The bitmap image inside it is small, 5 x 5 pixels.
When assigned to a PictureBox

Answer 1

A solution I've seen around a couple of times is to make an overriding class of PictureBox which has the InterpolationMode as class property. Then all you need to do is use this class on the UI instead of .Net's own PictureBox, and set that mode to NearestNeighbor.

Public Class PixelBox
    Inherits PictureBox

    
    
    Public Property InterpolationMode As InterpolationMode = InterpolationMode.NearestNeighbor

    Protected Overrides Sub OnPaint(pe As PaintEventArgs)
        Dim g As Graphics = pe.Graphics
        g.InterpolationMode = Me.InterpolationMode
        ' Fix half-pixel shift on NearestNeighbor
        If Me.InterpolationMode = InterpolationMode.NearestNeighbor Then _
            g.PixelOffsetMode = PixelOffsetMode.Half
        MyBase.OnPaint(pe)
    End Sub
End Class

As was remarked in the comments, for Nearest Neighbor mode, you need to set the PixelOffsetMode to Half. I honestly don't understand why they bothered exposing that rather than making it an automatic choice inside the internal rendering process.

The size can be controlled by setting the control's SizeMode property. Putting it to Zoom will make it automatically center and expand without clipping in the control's set size.