Fix calculation of image printed area (used in finding weighted DPI f…

…or OCR)

Fixes #1334

src/ocrmypdf/pdfinfo/info.py

@@ -491,7 +491,7 @@ def printed_area(self) -> float:
         """Physical area of the image in square inches."""
         if not self.renderable:
             return 0.0
-        return float(self.width * self.dpi.x * self.height * self.dpi.y)
+        return float((self.width / self.dpi.x) * (self.height / self.dpi.y))
 
     def __repr__(self):
         """Return a string representation of the image."""