双层PDF就是有两层结构的文件，一层是图片，一层是文字。
双层PDF的优点显而易见，既保留了原文件尤其是原图片的真实状态，又因为具有文本层，方便了数据管理和索引。
采用reportlab 来生成双层pdf
#!/usr/local/python3/bin/python3
# -*- coding: utf-8 -*
import os
# import urllib2
import time
from reportlab import platypus
from reportlab.lib.pagesizes import letter
from reportlab.lib.units import inch
from reportlab.platypus import SimpleDocTemplate, Image
from reportlab.pdfgen import canvas
image_file = "/data/wwwroot/default/asset/pdf.png"
# Use Canvas to generate pdf
c = canvas.Canvas('/data/wwwroot/default/Data/reportlab_canvasdemo.pdf', pagesize=letter)
width, height = letter
c.setFillColorRGB(0,0.77,0.77)
# say hello (note after rotate the y coord needs to be negative!)
c.drawString( 3*inch, 3*inch, "Hello World")
c.drawImage(image_file, 0 , 0)
c.showPage()
c.save()
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