diff --git a/ocrmypdf/__main__.py b/ocrmypdf/__main__.py
index b8302631..07b943c5 100755
--- a/ocrmypdf/__main__.py
+++ b/ocrmypdf/__main__.py
@@ -1529,7 +1529,10 @@ def run_pipeline():
         _log.info("Output sent to stdout")
 
     with _pdfinfo_lock:
-        _log.debug(_pdfinfo)
+        if options.verbose:
+            from pprint import pformat
+            referent = _pdfinfo._getvalue()  # get the real list out of proxy
+            _log.debug(pformat(referent))
         direction = {0: 'n', 90: 'e',
                      180: 's', 270: 'w'}
         orientations = []
diff --git a/ocrmypdf/pageinfo.py b/ocrmypdf/pageinfo.py
index 216562a5..9470f37c 100644
--- a/ocrmypdf/pageinfo.py
+++ b/ocrmypdf/pageinfo.py
@@ -326,9 +326,11 @@ def _find_page_regular_images(page, pageinfo, contentsinfo):
             image['dpi_w'] = max(dpi_w, image.get('dpi_w', 0))
             image['dpi_h'] = max(dpi_h, image.get('dpi_h', 0))
 
-        image['dpi_w'] = Decimal(image['dpi_w'])
-        image['dpi_h'] = Decimal(image['dpi_h'])
-        image['dpi'] = (image['dpi_w'] * image['dpi_h']) ** Decimal(0.5)
+        DPI_PREC = Decimal('1.000')
+        image['dpi_w'] = Decimal(image['dpi_w']).quantize(DPI_PREC)
+        image['dpi_h'] = Decimal(image['dpi_h']).quantize(DPI_PREC)
+        dpi = Decimal(image['dpi_w'] * image['dpi_h']).sqrt()
+        image['dpi'] = dpi.quantize(DPI_PREC)
         yield image