Get Grayscale Value of grayscale image

I'm making application for image recognition using grayscale image format. the problem is how to get the values ​​from the gray image.
I have a sample program but I might not be able to use this code to VB.net, because the code for vb.6. Can someone convert this code to vb.net?or do you have another solution?
I was more expecting another solution to this problem in VB.net code.

thank you very much

Code:

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For Y = 1 to Picture1.scaleheight
For x = 1 to Picture1.ScaleWidht

p = Get pixel (picture1.hdc, X,Y)
r= p and &HFF
g = (p\&H100)and &HFF
b = (p\&H10000)and &HFF

grtotr=grtotr + r
grratr = Round(gtotr/(picture1.ScaleHeight*Picture1.Scalewidht),2)

grtotg=grtotg + g
grratg = Round(gtotg/(picture1.ScaleHeight*Picture1.Scalewidht),2)

grtotb=grtotb + b
grratb = Round(gtotb/(picture1.ScaleHeight*Picture1.Scalewidht),2)

Next
Next

Text1.text = grratr
Text2.text = ggratg
Text3.text = ggratb

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Perhaps you should elucidate for us exactly what value(s) you are attempting to obtain here. As it stands it looks to be almost entirely arbitrary.

I think he wants to be able to read the image pixel values.

@Op

Read this. It shows how to use LockBits to read and write to pixels in an image.

Quote:

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Originally Posted by dunfiddlin

Perhaps you should elucidate for us exactly what value(s) you are attempting to obtain here. As it stands it looks to be almost entirely arbitrary.

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calculate the RGB values ​​of the image will then be averaged.

vb.net Code:

Dim r, g, b As Integer
        Dim bmp As New Bitmap("C:\a.png") ' bitmap format has native GetPixel function
        For i = 0 To bmp.Width - 1
            For j = 0 To bmp.Height - 1
                Dim col = bmp.GetPixel(i, j)
                r += col.R
                g += col.G
                b += col.B
            Next
        Next
        r = r \ (bmp.Width * bmp.Height)
        g = g \ (bmp.Width * bmp.Height)
        b = b \ (bmp.Width * bmp.Height)
 
        Me.Text = r & " " & g & " " & b