تبدیل یک تصویر رنگی به معادل GrayScal آن
https://barnamenevis.org/showpo...9&postcount=96
Imports System.Drawing.Imaging
Public Shared Function MakeGrayscale(ByVal original As Bitmap) As Bitmap
' //create a blank bitmap the same size as original
Dim newBitmap As Bitmap = New Bitmap(original.Width, original.Height)
'//get a graphics object from the new image
Dim g As Graphics = Graphics.FromImage(newBitmap)
'//create the grayscale ColorMatrix
Dim array()() As Single = New Single()() {New Single() {0.3F, 0.3F, 0.3F, 0, 0}, _
New Single() {0.59F, 0.59F, 0.59F, 0, 0}, _
New Single() {0.11F, 0.11F, 0.11F, 0, 0}, _
New Single() {0, 0, 0, 1, 0}, _
New Single() {0, 0, 0, 0, 1}}
Dim colorMatrix As ColorMatrix = New ColorMatrix(array)
'//create some image attributes
Dim attributes As ImageAttributes = New ImageAttributes()
'//set the color matrix attribute
attributes.SetColorMatrix(colorMatrix)
'//draw the original image on the new image
'//using the grayscale color matrix
g.DrawImage(original, New Rectangle(0, 0, original.Width, _
original.Height), 0, 0, original.Width, _
original.Height, GraphicsUnit.Pixel, attributes)
'//dispose the Graphics object
g.Dispose()
Return newBitmap
End Function
Private Sub button1_Click(ByVal sender As Object, ByVal e As EventArgs) Handles Button1.Click
Dim b As Bitmap = PictureBox1.Image
PictureBox2.Image = MakeGrayscale(b)
End Sub
