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| Title | Invert the colors in an image using VB .NET |
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| Keywords | VB .NET, graphics, image, grayscale, image processing |
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| Categories | Graphics |
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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 and changes the red, green, and blue color components to 225 minus their original 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 r As Integer
Dim g As Integer
Dim b As Integer
For X = 0 To bm.Width - 1
For Y = 0 To bm.Height - 1
r = 255 - bm.GetPixel(X, Y).R
g = 255 - bm.GetPixel(X, Y).G
b = 255 - bm.GetPixel(X, Y).B
bm.SetPixel(X, Y, Color.FromArgb(r, g, b))
Next Y
Next X
picCanvas.Image = bm
End Sub
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