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| Title | Convert an image to grayscale using VB .NET |
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| Keywords | VB .NET, graphics, image, grayscale, image processing |
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| Categories | Database, VB.NET |
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The program creates a Bitmap object initialized from the picture. That sets the Bitmap's size and color support.
The code then loops through each pixel in the bitmap, averaging the red, green, and blue components and using the result to set the pixel's new value. When it has set each pixel's value, the program sets the picture box's Image property to the bitmap.
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Private Sub btnGo_Click(ByVal sender As System.Object, _
ByVal e As System.EventArgs) Handles btnGo.Click
Dim bm As New Bitmap(picCanvas.Image)
Dim X As Integer
Dim Y As Integer
Dim clr As Integer
For X = 0 To bm.Width - 1
For Y = 0 To bm.Height - 1
clr = (CInt(bm.GetPixel(X, Y).R) + _
bm.GetPixel(X, Y).G + _
bm.GetPixel(X, Y).B) \ 3
bm.SetPixel(X, Y, Color.FromArgb(clr, clr, clr))
Next Y
Next X
picCanvas.Image = bm
End Sub
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