8 bit grayscale?

[Omelskitot]

Is this a code for generating 8 bit grayscale??

1.Private Sub CMDGRAY_Click()
2.Dim X As Integer, Y As Integer
3.Dim R As Integer, G As Integer, B As Integer, A As Integer
4.For X = 1 To ubx
5.For Y = 1 To uby
6.pixels(X, Y) = Picture1.Point(X, Y)
7.Next Y
8.Next X
9. 
10.For X = 1 To ubx
11.For Y = 1 To uby
12.R = pixels(X, Y) And &HFF
13.G = ((pixels(X, Y) And &HFF00) / &H100) Mod &H100
14.B = ((pixels(X, Y) And &HFF0000) / &H10000) Mod &H100
15.A = (R + G + B) / 3
16.pixels(X, Y) = RGB(A, A, A)
17.Next Y
18.Next X
19.For X = 1 To ubx
20.For Y = 1 To uby
21.Picture2.PSet (X, Y), pixels(X, Y)
22.Next Y
23.Next X

[Rabbit]

It should be relatively easy to see if that's the case by running the code.

[Killer42]

Note that for a better grayscale the colours aren't given equal weight. In other words, red, green and blue don't all contribute the same amount to the darkness of the resulting gray.

I forget the exact proportions, but the ColourToGreyscale function in this article looks as though it may help.