From 795ab3471475307d4d3482c32a6aaf0a19e85d8c Mon Sep 17 00:00:00 2001
From: Jonas Havelka <jonas.havelka@moznabude.cz>
Date: Tue, 6 Apr 2021 23:11:22 +0200
Subject: [PATCH] Fix convert to gs

---
 seminar/models.py | 19 ++++++++++++-------
 1 file changed, 12 insertions(+), 7 deletions(-)

diff --git a/seminar/models.py b/seminar/models.py
index 63c9bdfa..afa54367 100644
--- a/seminar/models.py
+++ b/seminar/models.py
@@ -602,13 +602,18 @@ class Cislo(SeminarModelBase):
 			png_filename = pathlib.Path(tempfile.mkdtemp(), 'nahled.png')
 
 			subprocess.run([
-				"convert",
-				"-density", "300x300",
-				"-geometry", "{}x{}".format(VYSKA, sirka),
-				"-background", "white",
-				"-flatten",
-				"{}[0]".format(self.pdf.path),  # titulní strana
-				png_filename
+				"gs",
+				"-sstdout=%stderr",
+				"-dSAFER",
+				"-dNOPAUSE",
+				"-dBATCH",
+				"-dNOPROMPT",
+				"-sDEVICE=pngalpha",
+				"-r{}x{}".format(VYSKA, sirka),
+				"-dFirstPage=1d",
+				"-dLastPage=1d",
+				"-sOutputFile=" + str(png_filename),
+				"-f%s" % self.pdf.path
 				],
 				check=True,
 				capture_output=True