Nur in pdfposter.git.new/: build.
Nur in pdfposter.git.new/: dist.
Nur in pdfposter.git.new/: ez_setup.pyc.
Nur in pdfposter.git.new/pdftools: __init__.pyc.
diff -u -r pdfposter.git/pdftools/pdfposter/cmd.py pdfposter.git.new/pdftools/pdfposter/cmd.py
--- pdfposter.git/pdftools/pdfposter/cmd.py	2015-03-27 22:58:00.000000000 +0100
+++ pdfposter.git.new/pdftools/pdfposter/cmd.py	2015-07-18 14:28:56.339082584 +0200
@@ -23,7 +23,7 @@
 __copyright__ = "Copyright 2008-2013 by Hartmut Goebel <h.goebel@crazy-compilers.com>"
 __licence__ = "GNU General Public License version 3 (GPL v3)"
 
-from . import main, __version__, DEFAULT_MEDIASIZE, papersizes, DecryptionError
+from . import main, __version__, DEFAULT_OVERLAP_PERCENT, DEFAULT_MEDIASIZE, papersizes, DecryptionError
 import re
 import PyPDF2.utils
 
@@ -107,6 +107,8 @@
                      help='Specify the poster size (defaults to media size). ')
     group.add_option('-s', '--scale', type=float,
                      help='Specify a linear scaling factor to produce the poster.')
+    group.add_option('-O', '--overlap-percent', type=float, default = DEFAULT_OVERLAP_PERCENT,
+                     help='Image overlap (default: %g).' % DEFAULT_OVERLAP_PERCENT)
 
     opts, args = parser.parse_args()
 
Nur in pdfposter.git.new/pdftools/pdfposter: cmd.py.orig.
diff -u -r pdfposter.git/pdftools/pdfposter/__init__.py pdfposter.git.new/pdftools/pdfposter/__init__.py
--- pdfposter.git/pdftools/pdfposter/__init__.py	2015-03-27 22:58:00.000000000 +0100
+++ pdfposter.git.new/pdftools/pdfposter/__init__.py	2015-07-20 15:04:19.739936143 +0200
@@ -33,6 +33,7 @@
 import math
 
 DEFAULT_MEDIASIZE = 'a4'
+DEFAULT_OVERLAP_PERCENT = 0
 
 mm = 72 / 25.4
 
@@ -138,17 +139,17 @@
         log(18, 'Rotating %s specs to portrait format', which)
         return True
 
-def decide_num_pages(inbox, mediabox, posterbox, scale=None):
+def decide_num_pages(inbox, mediabox, posterbox, scale=None, overlap=0.01*DEFAULT_OVERLAP_PERCENT):
     """decide on number of pages"""
     # avoid changing original posterbox when handling multiple pages
     # (if --scale, posterbox is None)
     posterbox = posterbox and posterbox.copy()
-    cutmargin   = {'x': 0, 'y': 0} # todo
     whitemargin = {'x': 0, 'y': 0} # todo
     # media and image sizes (inbox) are fixed already
     # available drawing area per sheet
-    drawable_x = mediabox['width' ] - 2*cutmargin['x']
-    drawable_y = mediabox['height'] - 2*cutmargin['y']
+    drawable_x = mediabox['width' ] * (1-2*overlap)
+    drawable_y = mediabox['height'] * (1-2*overlap)
+    log(17, 'drawable dimensions: %.2f %.2f (calculated)', drawable_x, drawable_y)
 
     rotate = False
 
@@ -256,12 +257,13 @@
     page[NameObject('/Contents')] = outpdf._addObject(content)
 
 
-def posterize(outpdf, page, mediabox, posterbox, scale, use_ArtBox=False):
+def posterize(outpdf, page, mediabox, posterbox, scale, use_ArtBox=False, overlap=0.01*DEFAULT_OVERLAP_PERCENT):
     """
     page: input page
     mediabox : size secs of the media to print on
     posterbox: size secs of the resulting poster
     scale: scale factor (to be used instead of posterbox)
+    overlap: proportion of expected overlap per output page
     """
     if use_ArtBox:
         inbox = rectangle2box(page.artBox)
@@ -270,7 +272,7 @@
     _clip_pdf_page(page, inbox['offset_x'], inbox['offset_y'],
                    inbox['width'], inbox['height'])
     ncols, nrows, scale, rotate = decide_num_pages(inbox, mediabox,
-                                                   posterbox, scale)
+                                                   posterbox, scale, overlap)
     mediabox = mediabox.copy()
     _scale_pdf_page(outpdf, page, scale)
     if rotate:
@@ -278,7 +280,7 @@
         rotate_box(inbox)
         rotate_box(mediabox)
     # area to put on each page (allows for overlay of margin)
-    h_step = mediabox['width']  - mediabox['offset_x']
+    h_step = mediabox['width'] - mediabox['offset_x'] 
     v_step = mediabox['height'] - mediabox['offset_y']
     
     if use_ArtBox:
@@ -288,7 +290,7 @@
     h_pos = float(trimbox['offset_x'])
     h_max, v_max = float(trimbox['width']), float(trimbox['height'])
     for col in range(ncols):
-        v_pos = float(trimbox['offset_y']) + (nrows-1) * v_step
+        v_pos = float(trimbox['offset_y']) + (nrows-1) * v_step * (1-2*overlap)
         for row in range(nrows):
             log(17, 'Creating page with offset: %.2f %.2f' % (h_pos, v_pos))
             newpage = copyPage(page)
@@ -303,8 +305,8 @@
                                                min(v_max, v_pos + v_step)))
             newpage.artBox = newpage.trimBox
             outpdf.addPage(newpage)
-            v_pos -= v_step
-        h_pos += h_step
+            v_pos -= v_step*(1-2*overlap)
+        h_pos += h_step*(1-2*overlap)
 
 def password_hook():
     import getpass
@@ -341,7 +343,7 @@
         page = inpdf.getPage(i)
         log(19, '---- processing page %i -----', i+1)
         posterize(outpdf, page, opts.media_size, opts.poster_size, opts.scale,
-                  opts.use_ArtBox)
+                  opts.use_ArtBox, opts.overlap_percent/100.0)
 
     if not opts.dry_run:
         outpdf.write(open(outfilename, 'wb'))