diff --git a/korektury/models.py b/korektury/models.py
index 1430ec75..e5b6e01a 100644
--- a/korektury/models.py
+++ b/korektury/models.py
@@ -82,16 +82,25 @@ class KorekturovanePDF(models.Model):
         self.stran = 0
         while True:
             res = subprocess.call([
-                "convert",
-                "-density", "180x180",
-                "-geometry", " 1024x1448",
-                "%s[%d]" % (self.pdf.path, self.stran),
-                os.path.join(
+                #Parametry inspirovány chybovou hláškou imagemagicku
+                "gs",
+                "-sstdout=%stderr",
+                "-dSAFER",
+                "-dNOPAUSE",
+                "-dBATCH",
+                "-dNOPROMPT",
+                "-sDEVICE=pngalpha",
+                "-r180x180",
+                "-dFirstPage=%d" % (self.stran+1),
+                "-dLastPage=%d" % (self.stran+1),
+                "-sOutputFile="+os.path.join(
                     dirname,
-                    "%s-%d.png" % (self.get_prefix(), self.stran)
-                )
+                    "%s-%d.png" % (self.get_prefix(), self.stran)),
+                "-f%s" % (self.pdf.path)
             ])
-            if res == 1:
+            if not os.path.exists(os.path.join(
+                    dirname,
+                    "%s-%d.png" % (self.get_prefix(), self.stran))):
                 break
             self.stran += 1
         # Změnil se počet stran, ukládáme