SpiderImagePlugin.py 文件源码

def convert2byte(self, depth=255):
        (minimum, maximum) = self.getextrema()
        m = 1
        if maximum != minimum:
            m = depth / (maximum-minimum)
        b = -m * minimum
        return self.point(lambda i, m=m, b=b: i * m + b).convert("L")

    # returns a ImageTk.PhotoImage object, after rescaling to 0..255