diff --git a/cli/pom.xml b/cli/pom.xml
index 5a2b0df..a5e716d 100644
--- a/cli/pom.xml
+++ b/cli/pom.xml
@@ -9,7 +9,6 @@
     <relativePath>../parent</relativePath>
   </parent>
 
-  <groupId>com.sothr.imagetools</groupId>
   <artifactId>ImageTools-CLI</artifactId>
   <version>0.1.0</version>
   <packaging>jar</packaging>
diff --git a/engine/pom.xml b/engine/pom.xml
index e1c0d3f..2401ed9 100644
--- a/engine/pom.xml
+++ b/engine/pom.xml
@@ -9,7 +9,6 @@
     <relativePath>../parent</relativePath>
   </parent>
 
-  <groupId>com.sothr.imagetools</groupId>
   <artifactId>ImageTools-Engine</artifactId>
   <version>0.1.2</version>
   <packaging>jar</packaging>
diff --git a/engine/src/main/scala/com/sothr/imagetools/engine/ConcurrentEngine.scala b/engine/src/main/scala/com/sothr/imagetools/engine/ConcurrentEngine.scala
index 129afcf..67458fa 100644
--- a/engine/src/main/scala/com/sothr/imagetools/engine/ConcurrentEngine.scala
+++ b/engine/src/main/scala/com/sothr/imagetools/engine/ConcurrentEngine.scala
@@ -234,7 +234,7 @@ class ConcurrentEngineProcessingController extends Actor with ActorLogging {
    */
   def checkForResults() = {
     try {
-      listener ! SubmitMessage(s"Finished Processing ${processed}/${processed} images")
+      listener ! SubmitMessage(s"Finished Processing $processed/$processed images")
       processorsFinished = 0
       toProcess = 0
       processed = 0
@@ -396,7 +396,7 @@ class ConcurrentEngineSimilarityController extends Actor with ActorLogging {
    */
   def checkForResults() = {
     try {
-      listener ! SubmitMessage(s"Finished Scanning ${processed}/${processed} images")
+      listener ! SubmitMessage(s"Finished Scanning $processed/$processed images")
       processorsFinished = 0
       toProcess = 0
       processed = 0
diff --git a/engine/src/main/scala/com/sothr/imagetools/engine/hash/AHash.scala b/engine/src/main/scala/com/sothr/imagetools/engine/hash/AHash.scala
index 8fda977..16a04e2 100644
--- a/engine/src/main/scala/com/sothr/imagetools/engine/hash/AHash.scala
+++ b/engine/src/main/scala/com/sothr/imagetools/engine/hash/AHash.scala
@@ -3,6 +3,9 @@ package com.sothr.imagetools.engine.hash
 import grizzled.slf4j.Logging
 
 /**
+ * Speedy AHash Perceptual Hashing
+ * Uses the average value of the pixels as a baseline
+ *
  * Created by dev on 1/22/14.
  */
 object AHash extends PerceptualHasher with Logging {
diff --git a/engine/src/main/scala/com/sothr/imagetools/engine/hash/PHash.scala b/engine/src/main/scala/com/sothr/imagetools/engine/hash/PHash.scala
index 49aac58..232e96f 100644
--- a/engine/src/main/scala/com/sothr/imagetools/engine/hash/PHash.scala
+++ b/engine/src/main/scala/com/sothr/imagetools/engine/hash/PHash.scala
@@ -4,6 +4,9 @@ import edu.emory.mathcs.jtransforms.dct.FloatDCT_2D
 import grizzled.slf4j.Logging
 
 /**
+ * Complex perceptual hash
+ * Uses FFT to get
+ *
  * Created by dev on 1/22/14.
  */
 object PHash extends PerceptualHasher with Logging {
diff --git a/gui/pom.xml b/gui/pom.xml
index d146026..0da165e 100644
--- a/gui/pom.xml
+++ b/gui/pom.xml
@@ -9,7 +9,6 @@
     <relativePath>../parent</relativePath>
   </parent>
 
-  <groupId>com.sothr.imagetools</groupId>
   <artifactId>ImageTools-GUI</artifactId>
   <version>0.1.0</version>
   <packaging>jar</packaging>
diff --git a/gui/src/main/resources/fxml/mainapp/MainApp.fxml b/gui/src/main/resources/fxml/mainapp/MainApp.fxml
index 8772b33..969ae59 100644
--- a/gui/src/main/resources/fxml/mainapp/MainApp.fxml
+++ b/gui/src/main/resources/fxml/mainapp/MainApp.fxml
@@ -65,6 +65,11 @@
                       <bottom>
                         <FlowPane maxHeight="1.7976931348623157E308" maxWidth="1.7976931348623157E308" prefHeight="60.0" prefWidth="220.0" BorderPane.alignment="CENTER">
                           <children>
+                                          <CheckBox fx:id="doRecursiveProcessing" mnemonicParsing="false" text="Recursive">
+                                             <FlowPane.margin>
+                                                <Insets bottom="5.0" />
+                                             </FlowPane.margin>
+                                          </CheckBox>
                             <Button maxWidth="1.7976931348623157E308" minWidth="220.0" mnemonicParsing="false" onAction="#showAllImages" text="Show All Images">
                               <FlowPane.margin>
                                 <Insets bottom="5.0" />
diff --git a/gui/src/main/scala/com/sothr/imagetools/ui/component/ImageTile.scala b/gui/src/main/scala/com/sothr/imagetools/ui/component/ImageTile.scala
index 9792613..9845805 100644
--- a/gui/src/main/scala/com/sothr/imagetools/ui/component/ImageTile.scala
+++ b/gui/src/main/scala/com/sothr/imagetools/ui/component/ImageTile.scala
@@ -1,22 +1,76 @@
 package com.sothr.imagetools.ui.component
 
+import java.io.FileInputStream
+import javafx.event.EventHandler
+import javafx.geometry.Pos
+import javafx.scene.control.{Tooltip, Label}
+import javafx.scene.image.{ImageView}
+import javafx.scene.input.MouseEvent
 import javafx.scene.layout.VBox
 
-import com.sothr.imagetools.engine.image.Image
+import grizzled.slf4j.Logging
+import resource._
 
 /**
  * ImageTile class that is a special VBox
  *
  * Created by drew on 8/22/14.
  */
-class ImageTile extends VBox {
-  var imageData: Image = null
+class ImageTile(thumbnailWidth: Integer, image: com.sothr.imagetools.engine.image.Image) extends VBox with Logging {
+  val imageData: com.sothr.imagetools.engine.image.Image = image
+  val preferedTileSize = (thumbnailWidth + 32).toDouble
+  //set tile size
+  this.setPrefSize(preferedTileSize, preferedTileSize)
+  this.setMinSize(preferedTileSize, preferedTileSize)
+  this.setMaxSize(preferedTileSize, preferedTileSize)
 
-  def getImageData: Image = {
-    imageData
+  this.setAlignment(Pos.TOP_CENTER)
+  this.addEventFilter(MouseEvent.MOUSE_PRESSED, new EventHandler[MouseEvent] {
+    override def handle(event: MouseEvent): Unit = {
+      if (event.isPrimaryButtonDown) {
+        //double click
+        if (event.getClickCount == 2) {
+          // Look into http://stackoverflow.com/questions/228477/how-do-i-programmatically-determine-operating-system-in-java
+          // for proper multi-platform opening support
+          //Desktop.getDesktop.open(new File(image.getImagePath))
+        } else {
+
+        }
+      } else if (event.isSecondaryButtonDown) {
+        //right click context menu
+      }
+    }
+  })
+
+  // Image
+  val genImageView = new ImageView()
+  debug(s"Getting thumbnail from: ${image.getThumbnailPath}")
+  managed(new FileInputStream(image.getThumbnailPath)) acquireAndGet {
+    thumbSource =>
+      val thumbnail = new javafx.scene.image.Image(thumbSource)
+      genImageView.setImage(thumbnail)
+      if (thumbnail.getHeight > thumbnail.getWidth) {
+        genImageView.setFitHeight(128.0)
+      } else {
+        genImageView.setFitWidth(128.0)
+      }
   }
+  genImageView.setPreserveRatio(true)
+
+  this.getChildren.add(genImageView)
 
-  def setImageData(image: Image) = {
-    this.imageData = image
+  //Label
+  val imageLabel = new Label()
+  imageLabel.setText(s"${image.getHeight}x${image.getWidth}")
+  imageLabel.setWrapText(true)
+
+  //Tooltip
+  val tooltip = new Tooltip()
+  tooltip.setText(s"${image.getName}")
+  imageLabel.setTooltip(tooltip)
+  this.getChildren.add(imageLabel)
+
+  def getImageData: com.sothr.imagetools.engine.image.Image = {
+    imageData
   }
 }
diff --git a/gui/src/main/scala/com/sothr/imagetools/ui/component/ImageTileFactory.scala b/gui/src/main/scala/com/sothr/imagetools/ui/component/ImageTileFactory.scala
index 8cbb35b..017eaab 100644
--- a/gui/src/main/scala/com/sothr/imagetools/ui/component/ImageTileFactory.scala
+++ b/gui/src/main/scala/com/sothr/imagetools/ui/component/ImageTileFactory.scala
@@ -1,15 +1,9 @@
 package com.sothr.imagetools.ui.component
 
-import java.awt.Desktop
-import java.io.{File, FileInputStream}
-import javafx.event.EventHandler
-import javafx.geometry.{Insets, Pos}
-import javafx.scene.control.{Label, Tooltip}
-import javafx.scene.image.{Image, ImageView}
-import javafx.scene.input.MouseEvent
+import javafx.geometry.Insets
 
+import com.sothr.imagetools.engine.util.PropertiesService
 import grizzled.slf4j.Logging
-import resource._
 
 /**
  * Created by drew on 8/6/14.
@@ -19,58 +13,10 @@ import resource._
 object ImageTileFactory extends Logging {
 
   def get(image: com.sothr.imagetools.engine.image.Image): ImageTile = {
-    val imageTile = new ImageTile()
-    imageTile.setImageData(image)
-    //set tile size
-    imageTile.setPrefSize(160.0d, 160.0d)
-    imageTile.setMinSize(160.0d, 160.0d)
-    imageTile.setMaxSize(160.0d, 160.0d)
+    val thumbnailWidth = PropertiesService.get("app.thumbnail.size","128").toInt
+    val imageTile = new ImageTile(thumbnailWidth, image)
     //set padding
     imageTile.setPadding(new Insets(2, 2, 2, 2))
-    //imageTile.setSpacing(5.0d)
-    imageTile.setAlignment(Pos.TOP_CENTER)
-    imageTile.addEventFilter(MouseEvent.MOUSE_PRESSED, new EventHandler[MouseEvent] {
-      override def handle(event: MouseEvent): Unit = {
-        if (event.isPrimaryButtonDown) {
-          //double click
-          if (event.getClickCount == 2) {
-            Desktop.getDesktop.open(new File(image.getImagePath))
-          } else {
-
-          }
-        } else if (event.isSecondaryButtonDown) {
-          //right click context menu
-        }
-      }
-    })
-
-    // Image
-    val genImageView = new ImageView()
-    debug(s"Getting thumbnail from: ${image.getThumbnailPath}")
-    managed(new FileInputStream(image.getThumbnailPath)) acquireAndGet {
-      thumbSource =>
-        val thumbnail = new Image(thumbSource)
-        genImageView.setImage(thumbnail)
-        if (thumbnail.getHeight > thumbnail.getWidth) {
-          genImageView.setFitHeight(128.0)
-        } else {
-          genImageView.setFitWidth(128.0)
-        }
-    }
-    genImageView.setPreserveRatio(true)
-
-    imageTile.getChildren.add(genImageView)
-
-    //Label
-    val imageLabel = new Label()
-    imageLabel.setText(s"${image.getHeight}x${image.getWidth}")
-    imageLabel.setWrapText(true)
-
-    //Tooltip
-    val tooltip = new Tooltip()
-    tooltip.setText(s"${image.getName}")
-    imageLabel.setTooltip(tooltip)
-    imageTile.getChildren.add(imageLabel)
 
     imageTile
   }
diff --git a/gui/src/main/scala/com/sothr/imagetools/ui/controller/AppController.scala b/gui/src/main/scala/com/sothr/imagetools/ui/controller/AppController.scala
index abbfd13..336489a 100644
--- a/gui/src/main/scala/com/sothr/imagetools/ui/controller/AppController.scala
+++ b/gui/src/main/scala/com/sothr/imagetools/ui/controller/AppController.scala
@@ -1,13 +1,12 @@
 package com.sothr.imagetools.ui.controller
 
 import java.io.{File, IOException}
-import java.util.ArrayList
 import java.util.Scanner
 import javafx.application.Platform
 import javafx.event.ActionEvent
 import javafx.fxml.FXML
 import javafx.scene.control._
-import javafx.scene.layout.{VBox, TilePane, AnchorPane}
+import javafx.scene.layout.{AnchorPane, TilePane, VBox}
 import javafx.scene.text.{Text, TextAlignment}
 import javafx.scene.web.WebView
 import javafx.scene.{Group, Node, Scene}
@@ -15,17 +14,17 @@ import javafx.stage.{DirectoryChooser, Stage, StageStyle}
 import javafx.util.Callback
 
 import akka.actor._
+import com.sothr.imagetools.engine._
 import com.sothr.imagetools.engine.image.{Image, SimilarImages}
 import com.sothr.imagetools.engine.util.{PropertiesService, ResourceLoader}
-import com.sothr.imagetools.engine._
 import com.sothr.imagetools.ui.component.ImageTileFactory
 import grizzled.slf4j.Logging
 import org.markdown4j.Markdown4jProcessor
 
 import scala.collection.mutable
+import scala.concurrent.ExecutionContext.Implicits.global
 import scala.concurrent._
 import scala.util.{Failure, Success}
-import ExecutionContext.Implicits.global
 
 /**
  * Main Application controller
@@ -48,6 +47,7 @@ class AppController extends Logging {
   // Others
   @FXML var progressBar: ProgressBar = null
   @FXML var paginator: Pagination = null
+  @FXML var doRecursiveProcessing: CheckBox = null
 
   // Engine
   val engine: Engine = new ConcurrentEngine()
@@ -164,9 +164,9 @@ class AppController extends Logging {
   @FXML
   def showAllImages(event: ActionEvent) = {
     resetPaginator()
-    imageTilePane.getChildren.setAll(new ArrayList[Node]())
+    imageTilePane.getChildren.setAll(new java.util.ArrayList[Node]())
     val f: Future[List[Image]] = Future {
-      engine.getImagesForDirectory(currentDirectory)
+      engine.getImagesForDirectory(currentDirectory, recursive = doRecursiveProcessing.isSelected)
     }
 
     f onComplete {
@@ -187,10 +187,10 @@ class AppController extends Logging {
   @FXML
   def showSimilarImages(event: ActionEvent) = {
     resetPaginator()
-    imageTilePane.getChildren.setAll(new ArrayList[Node]())
+    imageTilePane.getChildren.setAll(new java.util.ArrayList[Node]())
 
     val f: Future[List[SimilarImages]] = Future {
-      engine.getSimilarImagesForDirectory(currentDirectory)
+      engine.getSimilarImagesForDirectory(currentDirectory, recursive = doRecursiveProcessing.isSelected)
     }
 
     f onComplete {
@@ -234,9 +234,9 @@ class AppController extends Logging {
   def showPage(pageIndex: Integer) = {
     val itemsPerPage = PropertiesService.get("app.ui.thumbsPerPage", "50").toInt
     val startIndex = pageIndex * itemsPerPage
-    val endIndex = if ((startIndex + itemsPerPage) > this.currentImages.size) this.currentImages.length else (startIndex + itemsPerPage)
+    val endIndex = if ((startIndex + itemsPerPage) > this.currentImages.size) this.currentImages.length else startIndex + itemsPerPage
     //clear and populate the scrollpane
-    imageTilePane.getChildren.setAll(new ArrayList[Node]())
+    imageTilePane.getChildren.setAll(new java.util.ArrayList[Node]())
     val images = this.currentImages.slice(startIndex, endIndex)
     Platform.runLater(new Runnable() {
       override def run() {