View difference between Paste ID: wJYSQmQE and s7DTfGYu

 ###########steg.py##############
 #reddit.com/r/dailyprogrammer
 #int-101
 #puts data in image
 
 import sys, Image
 
 #verify correct number of arguments entered
 if len(sys.argv) != 3:
     print 'Please specify correct arguments'
     print 'Usage: steg.py {image file} {data file}'
     sys.exit()
 
 #get file names from arguments
 image_fn = sys.argv[1]
 data_fn = sys.argv[2]
 
 #read in our image file and declare variables
 img = Image.open(image_fn)
 pixels = img.load()
 im_width = img.size[0]
 im_height = img.size[1]
 
 #read in our data file and declare variables
 with open(data_fn, 'r') as f:
     data = f.read()
 b_data = ""
 for char in data:
     b_data += '%08d'%int(bin(ord(char))[2:])
 
 b_data += '11111111' #used to find end when getting data out
 
 #add data to image file
 for x in range(im_width):
     for y in range(im_height):
         if len(b_data) == 0:
             break
 
         pix = pixels[x,y]
 
         blueBase = bin(pix[2])[2:] #current pixels blue binary value
         newBlue = blueBase[:-2] + b_data[0:2] #create new binary value
 
         b_data = b_data[2:] #remove used bits from b_data
 
         pixels[x,y] = (pix[0],pix[1],int(newBlue,2)) #put new pixel into image file
     else:
         continue
     break
 
 #save new image
-img.save('steg'+image_fn)
+img.save('steg.png')
 
 ###########desteg.py#############
 #desteg.py
 #reddit.com/r/dailyprogrammer
 #int-101
 #pulls data out of image
 
 import sys, Image
 
 #verify correct number of arguments entered
 if len(sys.argv) != 2:
     print 'Please specify correct arguments'
     print 'Usage: desteg.py {image file}'
     sys.exit()
 
 #get file names from arguments
 image_fn = sys.argv[1]
 
 #read in our image file and declare variables
 img = Image.open(image_fn)
 pixels = img.load()
 im_width = img.size[0]
 im_height = img.size[1]
 
 #get bianry data
 b_data = ""
 for x in range(im_width):
     for y in range(im_height):
         pix = pixels[x,y]
         b_data += bin(pix[2])[-2:]
 
 #get actual data
 s_data = ""
 for x in range(0,len(b_data),8):
     chunk = b_data[x:x+8]
     if chunk == '11111111':
         break #end of steganography data
 
     char = chr(int(chunk,2))
     s_data += char
 
 print s_data