efficient way to compare 2 images?

[bplus]

yeah alpha = 255 then no difference to no alpha color

Code: (Select All)

Screen _NewImage(800, 600, 32)
Dim i As Long
For i = 0 To 255
    Cls
    Line (100, 100)-Step(100, 100), _RGB32(255, 0, 0, i), BF
    Line (300, 100)-Step(100, 100), _RGB32(255, 0, 0), BF
    If Point(150, 150) = Point(350, 150) Then
        Print "When alpha ="; i; " have NO difference, zzz ..."
    Else
        Print "When alpha ="; i; " have difference, zzz ..."
    End If
    Sleep
Next