From cbb94a638ed172f149dd0e42c7c06c1856072f40 Mon Sep 17 00:00:00 2001
From: Matt Davidson <davidso1@rose-hulman.edu>
Date: Fri, 23 Oct 2015 09:31:20 -0400
Subject: [PATCH] MDL-51779 assign: PDF annotate quality

Fixes the quality of pdf content when annotating.
---
 mod/assign/feedback/editpdf/classes/pdf.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mod/assign/feedback/editpdf/classes/pdf.php b/mod/assign/feedback/editpdf/classes/pdf.php
index e2884d82d2a..86e193c1645 100644
--- a/mod/assign/feedback/editpdf/classes/pdf.php
+++ b/mod/assign/feedback/editpdf/classes/pdf.php
@@ -445,7 +445,7 @@ class pdf extends \FPDI {
             $filename = \escapeshellarg($this->filename);
             $pagenoinc = \escapeshellarg($pageno + 1);
             $command = "$gsexec -q -sDEVICE=png16m -dSAFER -dBATCH -dNOPAUSE -r$imageres -dFirstPage=$pagenoinc -dLastPage=$pagenoinc ".
-                "-dGraphicsAlphaBits=4 -dTextAlphaBits=4 -sOutputFile=$imagefilearg $filename";
+                "-dDOINTERPOLATE -dGraphicsAlphaBits=4 -dTextAlphaBits=4 -sOutputFile=$imagefilearg $filename";
 
             $output = null;
             $result = exec($command, $output);