Sub SeekBar1_ValueChanged (Value As Int, UserChanged As Boolean)
Private abd As ABExtDrawing
Private recta As Rect
recta.Initialize(0,0,imgPhoto.Width,imgPhoto.Height)
lblSeek1.Text="Brightness: " & c
paint.SetColorMatrixColorFilter(Array As Float(1, 0, 0, 0, c,0, 1, 0, 0, c,0, 0, 1, 0, c,0, 0, 0, 1, 0,0, 0, 0, 0, 1))
abd.drawBitmap(canvas2,bm,Null,recta,paint) 'canvas2 is a canvas to be drawn, bm is my photo bitmap, recta is as Rect where to be drawn, paint is the brightness filter
Activity.Invalidate2(recta) 'realtime seekbar change
End Sub