From 7af0d47e2957c7c53884904656ef8b9f39b75b53 Mon Sep 17 00:00:00 2001
From: Olaf Meeuwissen <paddy-hack@member.fsf.org>
Date: Sun, 30 Jun 2019 11:15:20 +0900
Subject: [PATCH] Keep warning out of redirected image data.  Fixes testsuite

---
 frontend/scanimage.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/frontend/scanimage.c b/frontend/scanimage.c
index 2a307309a..6906f906e 100644
--- a/frontend/scanimage.c
+++ b/frontend/scanimage.c
@@ -1975,7 +1975,7 @@ static int guess_output_format(const char* output_file)
 {
   if (output_file == NULL)
     {
-      printf("Output format is not set, using pnm as a default.\n");
+      fprintf(stderr, "Output format is not set, using pnm as a default.\n");
       return OUTPUT_PNM;
     }