Remove logger.info and use shutil.which to find pdftopng executable

camelot/backends/image_conversion.py

@@ -24,8 +24,6 @@ class ImageConversionBackend(object):
 
             if self.use_fallback:
                 for fallback in self.fallbacks:
-                    logger.info(f"Falling back on '{fallback}'")
-
                     try:
                         converter = backends[fallback]()
                         converter.convert(pdf_path, png_path)

camelot/backends/poppler_backend.py

@@ -1,11 +1,18 @@
 # -*- coding: utf-8 -*-
 
+import shutil
 import subprocess
 
 
 class PopplerBackend(object):
     def convert(self, pdf_path, png_path):
-        pdftopng_command = ["pdftopng", pdf_path, png_path]
+        pdftopng_executable = shutil.which("pdftopng")
+        if pdftopng_executable is None:
+            raise OSError(
+                "pdftopng is not installed. Please install it using the `pip install pdftopng` command."
+            )
+
+        pdftopng_command = [pdftopng_executable, pdf_path, png_path]
 
         try:
             subprocess.check_output(