diff --git a/libsrc/ffdec_lib/src/com/jpexs/decompiler/flash/importers/ImageImporter.java b/libsrc/ffdec_lib/src/com/jpexs/decompiler/flash/importers/ImageImporter.java
index be2a1bef1..7adc8bbd3 100644
--- a/libsrc/ffdec_lib/src/com/jpexs/decompiler/flash/importers/ImageImporter.java
+++ b/libsrc/ffdec_lib/src/com/jpexs/decompiler/flash/importers/ImageImporter.java
@@ -106,6 +106,24 @@ public class ImageImporter extends TagImporter {
 
     public Tag importImageAlpha(ImageTag it, byte[] newData) throws IOException {
 
+        try {
+            BufferedImage img = ImageHelper.read(newData);
+            int width = img.getWidth();
+            int height = img.getHeight();
+            byte[] data = new byte[width * height];
+            int[] imgData = img.getRGB(0, 0, width, height, null, 0, width);
+            for (int y = 0; y < height; y++) {
+                for (int x = 0; x < width; x++) {
+                    int alpha = (imgData[y * width + x] >> 24) & 0xff;
+                    data[y * width + x] = (byte) alpha;
+                }
+
+            }
+
+            newData = data;
+        } catch (IOException ex) {
+        }
+
         if (it instanceof DefineBitsJPEG3Tag) {
             ((DefineBitsJPEG3Tag) it).setImageAlpha(newData);
         } else if (it instanceof DefineBitsJPEG4Tag) {
diff --git a/src/com/jpexs/decompiler/flash/gui/PreviewPanel.java b/src/com/jpexs/decompiler/flash/gui/PreviewPanel.java
index 642b1c874..6bc02d348 100644
--- a/src/com/jpexs/decompiler/flash/gui/PreviewPanel.java
+++ b/src/com/jpexs/decompiler/flash/gui/PreviewPanel.java
@@ -80,12 +80,14 @@ import java.awt.Component;
 import java.awt.Font;
 import java.awt.Insets;
 import java.awt.event.ActionEvent;
+import java.io.BufferedInputStream;
 import java.io.BufferedOutputStream;
 import java.io.ByteArrayOutputStream;
 import java.io.File;
 import java.io.FileInputStream;
 import java.io.FileOutputStream;
 import java.io.IOException;
+import java.io.InputStream;
 import java.io.OutputStream;
 import java.io.StringReader;
 import java.io.StringWriter;
@@ -1137,7 +1139,7 @@ public class PreviewPanel extends JPersistentSplitPane implements TagEditorPanel
             //Inject Loader
             if (swf.isAS3() && Configuration.autoOpenLoadedSWFs.get() && !Configuration.internalFlashViewer.get() && !DebuggerTools.hasDebugger(swf)) {
                 SWF instrSWF;
-                try (FileInputStream fis = new FileInputStream(tempFile)) {
+                try (InputStream fis = new BufferedInputStream(new FileInputStream(tempFile))) {
                     instrSWF = new SWF(fis, false, false);
                 }