diff --git a/libse/BluRaySup/BluRaySupPicture.cs b/libse/BluRaySup/BluRaySupPicture.cs
index 0009d0eee..91d0d50c9 100644
--- a/libse/BluRaySup/BluRaySupPicture.cs
+++ b/libse/BluRaySup/BluRaySupPicture.cs
@@ -308,6 +308,7 @@ namespace Nikse.SubtitleEdit.Core.BluRaySup
         public static byte[] CreateSupFrame(BluRaySupPicture pic, Bitmap bmp, double fps, int bottomMargin, int leftOrRightMargin, ContentAlignment alignment, Point? overridePosition = null)
         {
             var bm = new NikseBitmap(bmp);
+            bm.SetTransparentTo(Color.Transparent);
             var colorPalette = GetBitmapPalette(bm);
             var pal = new BluRaySupPalette(colorPalette.Count);
             for (int i = 0; i < colorPalette.Count; i++)
diff --git a/libse/NikseBitmap.cs b/libse/NikseBitmap.cs
index e7b603ae8..adf0c351d 100644
--- a/libse/NikseBitmap.cs
+++ b/libse/NikseBitmap.cs
@@ -1442,14 +1442,14 @@ namespace Nikse.SubtitleEdit.Core
                 return false;
             }
 
-            if (Width == bitmap.Width && Height == bitmap.Height  &&
+            if (Width == bitmap.Width && Height == bitmap.Height &&
                 Width == 0 && Height == 0)
             {
                 return true;
             }
 
 
-            for (int i=0; i<_bitmapData.Length; i++)
+            for (int i = 0; i < _bitmapData.Length; i++)
             {
                 if (_bitmapData[i] != bitmap._bitmapData[i])
                 {
@@ -1459,5 +1459,21 @@ namespace Nikse.SubtitleEdit.Core
 
             return true;
         }
+
+        public void SetTransparentTo(in Color transparent)
+        {
+            var buffer = new byte[4];
+            buffer[0] = transparent.B;
+            buffer[1] = transparent.G;
+            buffer[2] = transparent.R;
+            buffer[3] = transparent.A;
+            for (var i = 0; i < _bitmapData.Length; i += 4)
+            {
+                if (_bitmapData[i + 3] == 0)
+                {
+                    Buffer.BlockCopy(buffer, 0, _bitmapData, i, 4);
+                }
+            }
+        }
     }
 }
\ No newline at end of file
diff --git a/src/Forms/ExportPngXml.cs b/src/Forms/ExportPngXml.cs
index 68d89b1f9..27c63bbeb 100644
--- a/src/Forms/ExportPngXml.cs
+++ b/src/Forms/ExportPngXml.cs
@@ -1,9 +1,9 @@
 using Nikse.SubtitleEdit.Core;
 using Nikse.SubtitleEdit.Core.BluRaySup;
 using Nikse.SubtitleEdit.Core.Enums;
+using Nikse.SubtitleEdit.Core.Interfaces;
 using Nikse.SubtitleEdit.Core.SubtitleFormats;
 using Nikse.SubtitleEdit.Core.VobSub;
-using Nikse.SubtitleEdit.Forms.Ocr;
 using Nikse.SubtitleEdit.Logic;
 using Nikse.SubtitleEdit.Logic.VideoPlayers;
 using System;
@@ -20,7 +20,6 @@ using System.Text.RegularExpressions;
 using System.Threading;
 using System.Windows.Forms;
 using System.Xml;
-using Nikse.SubtitleEdit.Core.Interfaces;
 
 namespace Nikse.SubtitleEdit.Forms
 {