Improve image preview generation to preserve transparency.

3 years ago · 35a9ec2714
1 changed files with 1 additions and 1 deletions
--- 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);