From 35a9ec27142782056acdbf8484866c91d5d2ba24 Mon Sep 17 00:00:00 2001
From: Igor Kulikov <ikulikov@thingsboard.io>
Date: Tue, 5 Dec 2023 14:55:55 +0200
Subject: [PATCH] Improve image preview generation to preserve transparency.

---
 .../main/java/org/thingsboard/server/dao/util/ImageUtils.java   | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/dao/src/main/java/org/thingsboard/server/dao/util/ImageUtils.java b/dao/src/main/java/org/thingsboard/server/dao/util/ImageUtils.java
index 128f9da304..466e9d4bab 100644
--- a/dao/src/main/java/org/thingsboard/server/dao/util/ImageUtils.java
+++ b/dao/src/main/java/org/thingsboard/server/dao/util/ImageUtils.java
@@ -130,7 +130,7 @@ public class ImageUtils {
             }
         }
 
-        BufferedImage thumbnail = new BufferedImage(preview.getWidth(), preview.getHeight(), BufferedImage.TYPE_INT_RGB);
+        BufferedImage thumbnail = new BufferedImage(preview.getWidth(), preview.getHeight(), BufferedImage.TYPE_INT_ARGB);
         thumbnail.getGraphics().drawImage(bufferedImage, 0, 0, preview.getWidth(), preview.getHeight(), null);
         ByteArrayOutputStream out = new ByteArrayOutputStream();
         ImageIO.write(thumbnail, "png", out);