PngImagePlugin.py 文件源码

def chunk_tRNS(self, pos, length):

        # transparency
        s = ImageFile._safe_read(self.fp, length)
        if self.im_mode == "P":
            if _simple_palette.match(s):
                i = s.find(b"\0")
                if i >= 0:
                    self.im_info["transparency"] = i
            elif _null_palette.match(s):
                self.im_info["transparency"] = 0
            else:
                self.im_info["transparency"] = s
        elif self.im_mode == "L":
            self.im_info["transparency"] = i16(s)
        elif self.im_mode == "RGB":
            self.im_info["transparency"] = i16(s), i16(s[2:]), i16(s[4:])
        return s