From a73bcabad80e8ae3578598364cbdf2630435da54 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Bar=C4=B1=C5=9F=20Soner=20U=C5=9Fakl=C4=B1?=
 <baris@nodebb.org>
Date: Wed, 24 Oct 2018 10:03:00 -0400
Subject: [PATCH] don't call .jpeg quality on pngs

---
 src/image.js | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/src/image.js b/src/image.js
index 5c2d233e90..7789caa0b6 100644
--- a/src/image.js
+++ b/src/image.js
@@ -32,19 +32,23 @@ image.resizeImage = function (data, callback) {
 			callback(err);
 		});
 	} else {
+		var sharpImage;
 		async.waterfall([
 			function (next) {
 				fs.readFile(data.path, next);
 			},
 			function (buffer, next) {
 				var sharp = requireSharp();
-				var sharpImage = sharp(buffer, {
+				sharpImage = sharp(buffer, {
 					failOnError: true,
 				});
+				sharpImage.metadata(next);
+			},
+			function (metadata, next) {
 				sharpImage.rotate(); // auto-orients based on exif data
 				sharpImage.resize(data.hasOwnProperty('width') ? data.width : null, data.hasOwnProperty('height') ? data.height : null);
 
-				if (data.quality) {
+				if (data.quality && metadata.format === 'jpeg') {
 					sharpImage.jpeg({ quality: data.quality });
 				}