Add pdftopng

camelot/parsers/lattice.py

@@ -208,17 +208,10 @@ def _copy_spanning_text(t, copy_text=None):
         return t
 
     def _generate_image(self):
-        from ..ext.ghostscript import Ghostscript
+        from pdftopng import pdftopng
 
         self.imagename = "".join([self.rootname, ".png"])
-        gs_call = "-q -sDEVICE=png16m -o {} -r300 {}".format(
-            self.imagename, self.filename
-        )
-        gs_call = gs_call.encode().split()
-        null = open(os.devnull, "wb")
-        with Ghostscript(*gs_call, stdout=null) as gs:
-            pass
-        null.close()
+        pdftopng.convert(pdf_path=self.filename, png_path=self.rootname)
 
     def _generate_table_bbox(self):
         def scale_areas(areas):

setup.py

@@ -23,8 +23,9 @@
     'PyPDF2>=1.26.0'
 ]
 
-cv_requires = [
-    'opencv-python>=3.4.2.17'
+base_requires = [
+    'opencv-python>=3.4.2.17',
+    'pdftopng>=0.1.0'
 ]
 
 plot_requires = [
@@ -40,7 +41,7 @@
     'Sphinx>=3.1.2'
 ]
 
-all_requires = cv_requires + plot_requires
+all_requires = base_requires + plot_requires
 dev_requires = dev_requires + all_requires
 
 
@@ -58,7 +59,7 @@ def setup_package():
                     install_requires=requires,
                     extras_require={
                         'all': all_requires,
-                        'cv': cv_requires,
+                        'base': base_requires,
                         'dev': dev_requires,
                         'plot': plot_requires
                     },