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jmseight · 04-26-2012, 11:16 PM

Hi,

I removed the K3G browser resize artifact by setting the screen to 706x600.

This makes perfect dithering.

Code:

#!/usr/bin/python
#eMonitor
#Version 4 modified by jmseight for Kindle/Story (4-26-2012)
#  Rotate screen 90 deg
#  Support Dithering if turned on (no flash on videos)
#    support cropping of dithering table
#    pre-multiple dither table for faster run time
#    saves as png for dithered
#    saves as jpeg and png for grayscale, compare file sizes, then send the smaller file
#  Reduce quality for faster load
#  Uses GeekMaster's Dithering Formula (MIT license)
#  Set to Story HD resolution

#based on eMonitor by Kranu
#Version 2 (9-1-2011)

#Tested on Windows 7 x64, Python 2.7.2, wxPython 2.8
#For more information, see: http://goo.gl/rJoLp

#BEGIN SETUP

#HTTP Server
port=8000              #port of http server (http://127.0.0.1:8000/)

#capture region
l,t=(0,0)              #left and right offset from primary monitor
w,h=(706,600)          #width and height of capture region
fn1 ='shot1.png'         #file name of screenshot
fn2 ='shot1.jpg'
fn = 'shot.png'
quality = "50"

dt = [
    3,129,34,160,10,136,42,168,192,66,223,97,200,73,231,105,50,
    176,18,144,58,184,26,152,239,113,207,81,247,121,215,89,14,
    140,46,180,7,133,38,164,203,77,235,109,196,70,227,101,62,188,
    30,156,54,180,22,148,251,125,219,93,243,117,211,85 ] # 0-255 dither table

white = 255     #white threshold
black = 0       #black threshold
dithered = True  #dithered or not

#//END SETUP

import wx,socket,os
from BaseHTTPServer import BaseHTTPRequestHandler, HTTPServer

class serv(BaseHTTPRequestHandler):
  def do_GET(self):
    self.send_response(200)
    if self.path.startswith('/'+fn):
      self.send_header('Content-type','image/jpeg')
      self.end_headers()
  
      app=wx.PySimpleApp()
      context=wx.ScreenDC()
      bitmap=wx.EmptyBitmap(w, h, -1)
 
      memory=wx.MemoryDC()
      memory.SelectObject(bitmap)
      memory.Blit(0, 0, w, h, context, l, t)
      memory.SelectObject(wx.NullBitmap)
 
      image=wx.ImageFromBitmap(bitmap)
      data=list(image.GetData())

#      for i in xrange(0,len(data),3):
#        data[i]=data[i+1]=data[i+2]=chr(int(0.2989*float(ord(data[i]))+0.5870*float(ord(data[i+1]))+0.1140*float(ord(data[i+2]))))

      i=0

      if dithered:
        for y in xrange(0,h,1):
          yy=(y&7)<<3
#          i=y*w*3
          for x in xrange(0,w,1):
#            j = ((y&7)<<3)|x&7
#            if dt[yy|x&7] < (ord(data[i])+(ord(data[i+1])<<1)+ord(data[i+2]))>>2:
#            if dt[((y&7)*8)|x&7] < (299*ord(data[i])+587*ord(data[i+1])+114*ord(data[i+2]))/1000 :
            if dt[yy|x&7] < (ord(data[i])+(ord(data[i+1])<<1)+ord(data[i+2])):
              data[i] = '\xff'
            else:
              data[i] = '\x00'
            i=i+3
      else:
        for y in xrange(0,h,1):
          for x in xrange(0,w,1):
#            i = (y*w + x)*3
#            j = ((y&7)<<3)|x&7
            data[i+2]=data[i+1]=data[i]= chr((ord(data[i])+(ord(data[i+1])<<1)+ord(data[i+2]))>>2)
#            data[i] = chr((ord(data[i])+(ord(data[i+1])<<1)+ord(data[i+2]))>>2)
#            data[i] = chr(int((299*ord(data[i])+587*ord(data[i+1])+144*ord(data[i+2]))/1000))
            i=i+3

      image.SetData("".join(data))
      image = image.Rotate90(False)

      image.SetOption(wx.IMAGE_OPTION_PNG_FORMAT, str(wx.PNG_TYPE_GREY_RED))
      image.SetOption(wx.IMAGE_OPTION_PNG_BITDEPTH, "8")

      if dithered:
        image.SaveFile(fn,wx.BITMAP_TYPE_PNG)
      else:
        image.SaveFile(fn1,wx.BITMAP_TYPE_PNG)
        image.SetOption("quality", quality)
        image.SaveFile(fn2,wx.BITMAP_TYPE_JPEG)
        size1 = os.stat(fn1).st_size
        size2 = os.stat(fn2).st_size
        if size2 < size1:
          image.SaveFile(fn,wx.BITMAP_TYPE_JPEG)
        else:
          image.SaveFile(fn,wx.BITMAP_TYPE_PNG)

      f=open(fn,'rb')
      self.wfile.write(f.read())
    else:
      self.send_header('Content-type','text/html')
      self.end_headers()
      self.wfile.write('<!doctype html>'\
        '<html lang="en">'\
        '<head>'\
        '<title>eMonitor by Kranu</title>'\
        '</head>'\
        '<body style="margin:0px;">'\
        '<img id="pic" src="'+fn+'" style="float:left;width:100%;height:100%;">'\
        '<script type="text/javascript">'\
        'document.getElementById("pic").onload=function() {'\
        '  document.getElementById("pic").src="'+fn+'?"+(new Date()).getTime();'\
        '}'\
        '</script>'\
        '</body>'\
        '</html>')
try:
  print 'eMonitor by jmseight (based on Kranu)'

  for j in xrange(0, len(dt), 1):
    if dt[j] < black:
      dt[j] = black
    if dt[j] > white:
      dt[j] = white
  for j in xrange(0, len(dt), 1):
    dt[j] = dt[j] * 4
    
  #Amazon's website is used here for its reliablity. Feel free to change it.
  s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
  s.connect(("amazon.com",80))

  print 'Starting.. ',
  server=HTTPServer(('',port),serv)
  print 'Press Ctrl+C to stop'
  print

  print 'On your Kindle/Story, visit http://'+s.getsockname()[0]+':'+str(port)+'/'

  server.serve_forever()
except KeyboardInterrupt:
  print 'Stopping.. ',
  server.socket.close()
  print 'Have a nice day!'

Thanks,
James