R/G/B值最小是0最大是255属Byte值类型
Dim cr As Color = 控件.BackColor '获取控件背景色
Dim alpha As Byte = cr.A '透明度
Dim R As Byte = cr.R 'R值
Dim G As Byte = cr.G 'G值
Dim B As Byte = cr.B 'B值
Dim outAcr As Color = Color.FromArgb(alpha, R, G, B) '创建带有透明通道的ARGB颜色
Dim outcr As Color = Color.FromArgb(R, G, B) '创建不透明的RGB颜色