diff --git a/scala-package/core/src/main/scala/org/apache/mxnet/Image.scala b/scala-package/core/src/main/scala/org/apache/mxnet/Image.scala
index 9fa75ed9b76f..52e26efb41f1 100644
--- a/scala-package/core/src/main/scala/org/apache/mxnet/Image.scala
+++ b/scala-package/core/src/main/scala/org/apache/mxnet/Image.scala
@@ -188,11 +188,11 @@ object Image {
     * @param transparency The transparency level
     * @return Color
     */
-  private def randomColor(transparency: Float) : Color = {
+  private def randomColor(transparency: Option[Float] = Some(1.0f)) : Color = {
     new Color(
       Math.random().toFloat, Math.random().toFloat, Math.random().toFloat,
-      transparency
-    ).darker()
+      transparency.get
+    )
   }
 
   /**
@@ -220,7 +220,7 @@ object Image {
     val fm = g2d.getFontMetrics(newFont)
     for (idx <- coordinate.indices) {
       val map = coordinate(idx)
-      g2d.setColor(randomColor(transparency.get))
+      g2d.setColor(randomColor(transparency).darker())
       g2d.drawRect(map("xmin"), map("ymin"), map("xmax") - map("xmin"), map("ymax") - map("ymin"))
       // Write the name of the bounding box
       if (names.isDefined) {
@@ -234,7 +234,6 @@ object Image {
       }
     }
     g2d.dispose()
-    src
   }
 
 }
diff --git a/scala-package/core/src/main/scala/org/apache/mxnet/javaapi/Image.scala b/scala-package/core/src/main/scala/org/apache/mxnet/javaapi/Image.scala
index b526a8fa050c..f72223d1e4da 100644
--- a/scala-package/core/src/main/scala/org/apache/mxnet/javaapi/Image.scala
+++ b/scala-package/core/src/main/scala/org/apache/mxnet/javaapi/Image.scala
@@ -125,7 +125,7 @@ object Image {
                         java.util.Map[java.lang.String, java.lang.Integer]],
                       names: java.util.List[java.lang.String]): Unit = {
     val coord = coordinate.asScala.map(
-      ele => ele.asScala.map(ele => (ele._1, Integer2int(ele._2))).toMap).toArray
+      _.asScala.map{case (name, value) => (name, Integer2int(value))}.toMap).toArray
     org.apache.mxnet.Image.drawBoundingBox(src, coord, Option(names.asScala.toArray))
   }
 
diff --git a/scala-package/core/src/test/scala/org/apache/mxnet/ImageSuite.scala b/scala-package/core/src/test/scala/org/apache/mxnet/ImageSuite.scala
index 251ddef6af51..db9cf17e2ce0 100644
--- a/scala-package/core/src/test/scala/org/apache/mxnet/ImageSuite.scala
+++ b/scala-package/core/src/test/scala/org/apache/mxnet/ImageSuite.scala
@@ -108,6 +108,15 @@ class ImageSuite extends FunSuite with BeforeAndAfterAll {
     val tempDirPath = System.getProperty("java.io.tmpdir")
     ImageIO.write(buf, "png", new File(tempDirPath + "/inputImages/out2.png"))
     logger.info(s"converted image stored in ${tempDirPath + "/inputImages/out2.png"}")
+    for (coord <- box) {
+      val topLeft = buf.getRGB(coord("xmin"), coord("ymin"))
+      val downLeft = buf.getRGB(coord("xmin"), coord("ymax"))
+      val topRight = buf.getRGB(coord("xmax"), coord("ymin"))
+      val downRight = buf.getRGB(coord("xmax"), coord("ymax"))
+      require(topLeft == downLeft)
+      require(topRight == downRight)
+      require(topLeft == downRight)
+    }
   }
 
 }