Changes suggested by Intellij in the category "Performance".

Updated.

imageio/imageio-bmp/src/main/java/com/twelvemonkeys/imageio/plugins/bmp/BMPImageReader.java

@@ -54,6 +54,7 @@ import java.io.File;
 import java.io.IOException;
 import java.nio.ByteOrder;
 import java.util.Arrays;
+import java.util.Collections;
 import java.util.Iterator;
 
 /**
@@ -196,7 +197,7 @@ public final class BMPImageReader extends ImageReaderBase {
         checkBounds(pImageIndex);
 
         // TODO: Better implementation, include INT_RGB types for 3BYTE_BGR and 4BYTE_ABGR for INT_ARGB
-        return Arrays.asList(getRawImageType(pImageIndex)).iterator();
+        return Collections.singletonList(getRawImageType(pImageIndex)).iterator();
     }
 
     @Override