diff --git a/cpdfimage.ml b/cpdfimage.ml
index cdecab4..b7ca2a0 100644
--- a/cpdfimage.ml
+++ b/cpdfimage.ml
@@ -235,8 +235,8 @@ let rec image_resolution_page pdf page pagenum dpi images =
                             let newpdf = Pdfpage.change_pages false pdf [page] in
                               image_resolution newpdf [pagenum] dpi
                    | (pagenum, name, Image (w, h), objnum) ->
-                       let lx = Pdfunits.points (distance_between o x) Pdfunits.Inch in
-                       let ly = Pdfunits.points (distance_between o y) Pdfunits.Inch in
+                       let lx = Pdfunits.inches (distance_between o x) Pdfunits.PdfPoint in
+                       let ly = Pdfunits.inches (distance_between o y) Pdfunits.PdfPoint in
                          let wdpi = float w /. lx
                          and hdpi = float h /. ly in
                            image_results := (pagenum, xobject, w, h, wdpi, hdpi, objnum)::!image_results
diff --git a/cpdfmanual.pdf b/cpdfmanual.pdf
index 8919b4a..ff26d4c 100644
Binary files a/cpdfmanual.pdf and b/cpdfmanual.pdf differ
diff --git a/cpdfmanual.tex b/cpdfmanual.tex
index 3037407..3a5962e 100644
--- a/cpdfmanual.tex
+++ b/cpdfmanual.tex
@@ -279,7 +279,7 @@ These examples demonstrate just a few of the facilities provided by the Coherent
 
 \noindent Dump attachments to file, given the directory to put them in.
 
-\section*{\hyperref[chap:13]{Chapter 13: Working with Images}}
+\section*{\hyperref[chap:13]{Chapter 13: Images}}
 
 \begin{framed}\noindent\texttt{cpdf -image-resolution 600 in.pdf}\end{framed}