VB.Net Color Variation like in Autoit - vb.net

Question

I have a simple pixelsearch function searching for a certain Argb Color on screen.
This already works great and it finds the pixel with the color but I would like to add a Color Variation detection to it.
The Color of the pixel it should detect changes sometimes from (255, 100, 100, 100) to (255, 110, 94, 102) or something else (values are changing 10 points). Now the Pixelsearch function should have a Variationdetection so it would detect pixels with a near similar color so instead of only searching for color (255, 100, 100, 100) it should also search for (255, 101, 99, 102)... and more.
Is it possible to code that instead of Dim each Color and search for it?
Thats the code that I have already:
Private Sub BackgroundWorker1_DoWork(sender As Object, e As System.ComponentModel.DoWorkEventArgs) Handles BackgroundWorker1.DoWork
Dim xd3 = Color.FromArgb(255, 100, 100, 100) 'Searching for this color on the screen
Dim b As New Bitmap(2210, 1100) 'Position of Bitmap
Dim g As System.Drawing.Graphics = System.Drawing.Graphics.FromImage(b)
g.CopyFromScreen(Me.Left, Me.Top, 0, 0, b.Size) 'Searching on Screen
For i = 0 To (Me.Width - 0) 'searching each pixel
For j = 0 To (Me.Height - 0) 'searching each pixel
If b.GetPixel(i, j) = xd3 Then 'If pixel has same color that im searching for it will show a messagebox true
MessageBox.Show("true")
End If
Next
Next
End Sub

Answer 1

I suggest something like this :
If Color_Is_In_The_Target_Variations(10, b.GetPixel(i, j), xd3) Then
MessageBox.Show("true")
End If
and
Private Function Color_Is_In_The_Target_Variations(variation As Integer, tested As Color, target As Color) As Boolean
If tested.R >= target.R - variation And tested.R <= target.R + variation And
tested.G >= target.G - variation And tested.G <= target.G + variation And
tested.B >= target.B - variation And tested.B <= target.B + variation Then
Return True
Else
Return False
End If
End Function