a small script used to split each scanned pdf page into two images, and generate one pdf file.

splitpdfpage.py

#!/usr/bin/python

# for scanned page, this simple script
# split and dump each page into two png files.
#
# then these pages can be combined into one pdf
# file again.
#
# To merge png files into one pdf, I prefer to
# load pngs files with f-spot, and print the images
# into one pdf file. (set the printer to use scale, and
# one image per page.

import poppler
import gtk
import urllib
import sys

width = 2000 

# split pages 
def toimags(filename):
	doc = poppler.document_new_from_file('file://%s' % urllib.pathname2url(filename),
										password=None)
	for i in range(doc.get_n_pages()): 
		j = 2 * i;
		page = doc.get_page(i)
		height = (width * page.get_size()[1] / page.get_size()[0]) * 0.5
		pixbuf1 = gtk.gdk.Pixbuf(gtk.gdk.COLORSPACE_RGB, True, 8, width, height)
		pixbuf2 = gtk.gdk.Pixbuf(gtk.gdk.COLORSPACE_RGB, True, 8, width, height)
		page.render_to_pixbuf(src_x=0, src_y=0, src_width=width,
							  src_height=height,
							  scale=width/page.get_size()[0],
							  rotation=0, pixbuf=pixbuf1)
		page.render_to_pixbuf(src_x=0, src_y=height, src_width=width,
							  src_height=height,
							  scale=width/page.get_size()[0],
							  rotation=0, pixbuf=pixbuf2)
		pixbuf2.rotate_simple(270).save('test-%03d.png' % j, 'png')
		j = j + 1
		pixbuf1.rotate_simple(270).save('test-%03d.png' % j, 'png')
						  


if __name__ == '__main__':
	toimags(sys.argv[1])