diff --git a/src/app/CMakeLists.txt b/src/app/CMakeLists.txt
index 7cd5d302e..95ee0f102 100644
--- a/src/app/CMakeLists.txt
+++ b/src/app/CMakeLists.txt
@@ -300,14 +300,11 @@ if(ENABLE_UI)
     commands/filters/cmd_hue_saturation.cpp
     commands/filters/cmd_invert_color.cpp
     commands/filters/cmd_outline.cpp
-    commands/filters/cmd_replace_color.cpp
     commands/filters/color_curve_editor.cpp
     commands/filters/convolution_matrix_stock.cpp
-    commands/filters/filter_manager_impl.cpp
     commands/filters/filter_preview.cpp
     commands/filters/filter_target_buttons.cpp
     commands/filters/filter_window.cpp
-    commands/filters/filter_worker.cpp
     file_selector.cpp
     modules/editors.cpp
     modules/gfx.cpp
@@ -523,6 +520,9 @@ add_library(app-lib
   commands/cmd_undo.cpp
   commands/command.cpp
   commands/commands.cpp
+  commands/filters/cmd_replace_color.cpp
+  commands/filters/filter_manager_impl.cpp
+  commands/filters/filter_worker.cpp
   commands/move_thing.cpp
   commands/new_params.cpp
   commands/quick_command.cpp
diff --git a/src/app/commands/commands_list.h b/src/app/commands/commands_list.h
index 36db32f91..64fde251b 100644
--- a/src/app/commands/commands_list.h
+++ b/src/app/commands/commands_list.h
@@ -23,6 +23,7 @@ FOR_EACH_COMMAND(OpenFile)
 FOR_EACH_COMMAND(PaletteSize)
 FOR_EACH_COMMAND(Redo)
 FOR_EACH_COMMAND(RemoveLayer)
+FOR_EACH_COMMAND(ReplaceColor)
 FOR_EACH_COMMAND(SaveFile)
 FOR_EACH_COMMAND(SaveFileAs)
 FOR_EACH_COMMAND(SaveFileCopyAs)
@@ -119,7 +120,6 @@ FOR_EACH_COMMAND(RemoveFrameTag)
 FOR_EACH_COMMAND(RemoveSlice)
 FOR_EACH_COMMAND(ReopenClosedFile)
 FOR_EACH_COMMAND(RepeatLastExport)
-FOR_EACH_COMMAND(ReplaceColor)
 FOR_EACH_COMMAND(ReselectMask)
 FOR_EACH_COMMAND(ReverseFrames)
 FOR_EACH_COMMAND(Rotate)
diff --git a/src/app/commands/filters/cmd_replace_color.cpp b/src/app/commands/filters/cmd_replace_color.cpp
index 0e76080af..d631f04c4 100644
--- a/src/app/commands/filters/cmd_replace_color.cpp
+++ b/src/app/commands/filters/cmd_replace_color.cpp
@@ -24,6 +24,7 @@
 #include "app/find_widget.h"
 #include "app/ini_file.h"
 #include "app/load_widget.h"
+#include "app/pref/preferences.h"
 #include "app/site.h"
 #include "app/ui/color_bar.h"
 #include "app/ui/color_button.h"
@@ -38,7 +39,9 @@
 
 namespace app {
 
+#ifdef ENABLE_UI
 static const char* ConfigSection = "ReplaceColor";
+#endif
 
 struct ReplaceColorParams : public NewParams {
   Param<bool> ui { this, true, "ui" };
@@ -73,6 +76,8 @@ private:
   app::Color m_to;
 };
 
+#ifdef ENABLE_UI
+
 class ReplaceColorWindow : public FilterWindow {
 public:
   ReplaceColorWindow(ReplaceColorFilterWrapper& filter, FilterManagerImpl& filterMgr)
@@ -138,6 +143,8 @@ private:
   ui::Slider* m_toleranceSlider;
 };
 
+#endif  // ENABLE_UI
+
 class ReplaceColorCommand : public CommandWithNewParams<ReplaceColorParams> {
 public:
   ReplaceColorCommand();
@@ -160,7 +167,9 @@ bool ReplaceColorCommand::onEnabled(Context* context)
 
 void ReplaceColorCommand::onExecute(Context* context)
 {
+#ifdef ENABLE_UI
   const bool ui = (params().ui() && context->isUIAvailable());
+#endif
   Site site = context->activeSite();
 
   ReplaceColorFilterWrapper filter(site.layer());
@@ -174,14 +183,17 @@ void ReplaceColorCommand::onExecute(Context* context)
     TARGET_GRAY_CHANNEL |
     TARGET_ALPHA_CHANNEL);
 
+#ifdef ENABLE_UI
   if (ui) {
-    filter.setFrom(get_config_color(ConfigSection, "Color1", ColorBar::instance()->getFgColor()));
-    filter.setTo(get_config_color(ConfigSection, "Color2", ColorBar::instance()->getBgColor()));
+    filter.setFrom(get_config_color(ConfigSection, "Color1", Preferences::instance().colorBar.fgColor()));
+    filter.setTo(get_config_color(ConfigSection, "Color2", Preferences::instance().colorBar.bgColor()));
     filter.setTolerance(get_config_int(ConfigSection, "Tolerance", 0));
   }
-  else {
-    filter.setFrom(ColorBar::instance()->getFgColor());
-    filter.setTo(ColorBar::instance()->getBgColor());
+  else
+#endif // ENABLE_UI
+  {
+    filter.setFrom(Preferences::instance().colorBar.fgColor());
+    filter.setTo(Preferences::instance().colorBar.bgColor());
     filter.setTolerance(params().tolerance());
   }
 
@@ -190,6 +202,7 @@ void ReplaceColorCommand::onExecute(Context* context)
   if (params().tolerance.isSet()) filter.setTolerance(params().tolerance());
   if (params().target.isSet()) filterMgr.setTarget(params().target());
 
+#ifdef ENABLE_UI
   if (ui) {
     ReplaceColorWindow window(filter, filterMgr);
     if (window.doModal()) {
@@ -198,7 +211,9 @@ void ReplaceColorCommand::onExecute(Context* context)
       set_config_int(ConfigSection, "Tolerance", filter.getTolerance());
     }
   }
-  else {
+  else
+#endif // ENABLE_UI
+  {
     start_filter_worker(&filterMgr);
   }
 }
diff --git a/src/app/commands/filters/filter_manager_impl.cpp b/src/app/commands/filters/filter_manager_impl.cpp
index d09b5e78c..6dd1624ec 100644
--- a/src/app/commands/filters/filter_manager_impl.cpp
+++ b/src/app/commands/filters/filter_manager_impl.cpp
@@ -123,6 +123,8 @@ void FilterManagerImpl::begin()
   updateBounds(m_mask);
 }
 
+#ifdef ENABLE_UI
+
 void FilterManagerImpl::beginForPreview()
 {
   Doc* document = m_site.document();
@@ -161,6 +163,8 @@ void FilterManagerImpl::beginForPreview()
   }
 }
 
+#endif // ENABLE_UI
+
 void FilterManagerImpl::end()
 {
   m_maskBits.unlock();
@@ -244,7 +248,7 @@ void FilterManagerImpl::applyToTarget()
   switch (m_celsTarget) {
 
     case CelsTarget::Selected: {
-      auto range = App::instance()->timeline()->range();
+      auto range = m_site.range();
       if (range.enabled()) {
         for (Cel* cel : get_unlocked_unique_cels(m_site.sprite(), range)) {
           if (!cel->layer()->isReference())
@@ -332,6 +336,8 @@ void FilterManagerImpl::commitTransaction()
   m_tx->commit();
 }
 
+#ifdef ENABLE_UI
+
 void FilterManagerImpl::flush()
 {
   int h = m_row - m_nextRowToFlush;
@@ -382,6 +388,8 @@ void FilterManagerImpl::disablePreview()
   }
 }
 
+#endif  // ENABLE_UI
+
 const void* FilterManagerImpl::getSourceAddress()
 {
   return m_src->getPixelAddress(m_bounds.x, m_bounds.y+m_row);
@@ -429,9 +437,11 @@ Palette* FilterManagerImpl::getNewPalette()
 doc::PalettePicks FilterManagerImpl::getPalettePicks()
 {
   doc::PalettePicks picks;
+#ifdef ENABLE_UI                // TODO add palette entries in Site and use activeSite here
   ColorBar::instance()
     ->getPaletteView()
     ->getSelectedEntries(picks);
+#endif
   return picks;
 }
 
@@ -495,12 +505,16 @@ void FilterManagerImpl::restoreSpritePalette()
     m_site.sprite()->setPalette(m_oldPalette.get(), false);
 }
 
+#ifdef ENABLE_UI
+
 void FilterManagerImpl::redrawColorPalette()
 {
   set_current_palette(getNewPalette(), false);
   ColorBar::instance()->invalidate();
 }
 
+#endif // ENABLE_UI
+
 bool FilterManagerImpl::isMaskActive() const
 {
   return m_site.document()->isMaskVisible();
diff --git a/src/app/commands/filters/filter_manager_impl.h b/src/app/commands/filters/filter_manager_impl.h
index 19aa312ee..28bd2de55 100644
--- a/src/app/commands/filters/filter_manager_impl.h
+++ b/src/app/commands/filters/filter_manager_impl.h
@@ -83,7 +83,9 @@ namespace app {
     void setCelsTarget(CelsTarget celsTarget);
 
     void begin();
+#ifdef ENABLE_UI
     void beginForPreview();
+#endif
     void end();
     bool applyStep();
     void applyToTarget();
@@ -97,10 +99,11 @@ namespace app {
     doc::Image* destinationImage() const { return m_dst.get(); }
     gfx::Point position() const { return gfx::Point(0, 0); }
 
+#ifdef ENABLE_UI
     // Updates the current editor to show the progress of the preview.
     void flush();
-
     void disablePreview();
+#endif
 
     // FilterManager implementation
     const void* getSourceAddress() override;
@@ -131,7 +134,10 @@ namespace app {
     // modifies the palette).
     bool paletteHasChanged();
     void restoreSpritePalette();
+
+#ifdef ENABLE_UI
     void redrawColorPalette();
+#endif
 
     Context* m_context;
     Site m_site;
@@ -140,7 +146,9 @@ namespace app {
     doc::ImageRef m_src;
     doc::ImageRef m_dst;
     int m_row;
+#ifdef ENABLE_UI
     int m_nextRowToFlush;
+#endif
     gfx::Rect m_bounds;
     doc::Mask* m_mask;
     std::unique_ptr<doc::Mask> m_previewMask;
diff --git a/src/app/commands/filters/filter_worker.cpp b/src/app/commands/filters/filter_worker.cpp
index 8a5edd465..c9a6806ff 100644
--- a/src/app/commands/filters/filter_worker.cpp
+++ b/src/app/commands/filters/filter_worker.cpp
@@ -1,4 +1,5 @@
 // Aseprite
+// Copyright (C) 2019  Igara Studio S.A.
 // Copyright (C) 2001-2018  David Capello
 //
 // This program is distributed under the terms of
@@ -25,13 +26,54 @@
 
 #include <cstdlib>
 #include <cstring>
+#include <functional>
+#include <thread>
 
 namespace app {
 
 using namespace base;
 using namespace ui;
 
-static const int kMonitoringPeriod = 100;
+#ifdef ENABLE_UI
+
+namespace {
+
+const int kMonitoringPeriod = 100;
+
+class FilterWorkerAlert {
+public:
+  FilterWorkerAlert(std::function<void()>&& onTick)
+    : m_timer(kMonitoringPeriod)
+    , m_window(ui::Alert::create(Strings::alerts_applying_filter())) {
+    m_window->addProgress();
+
+    m_timer.Tick.connect(std::move(onTick));
+    m_timer.start();
+  }
+
+  void openAndWait() {
+    m_window->openWindowInForeground();
+
+    // Stop the monitoring timer.
+    m_timer.stop();
+  }
+
+  void close() {
+    m_window->closeWindow(nullptr);
+  }
+
+  void setProgress(double progress) {
+    m_window->setProgress(progress);
+  }
+
+private:
+  ui::Timer m_timer; // Monitoring timer to update the progress-bar
+  AlertPtr m_window; // Alert for the user to cancel the filter-progress if he wants.
+};
+
+} // anonymous namespace
+
+#endif  // ENABLE_UI
 
 // Applies filters in two threads: a background worker thread to
 // modify the sprite, and the main thread to monitoring the progress
@@ -50,12 +92,9 @@ public:
 
 private:
   void applyFilterInBackground();
+#ifdef ENABLE_UI
   void onMonitoringTick();
-
-  static void thread_proxy(void* data) {
-    FilterWorker* filterWorker = (FilterWorker*)data;
-    filterWorker->applyFilterInBackground();
-  }
+#endif
 
   FilterManagerImpl* m_filterMgr; // Effect to be applied.
   base::mutex m_mutex;          // Mutex to access to 'pos', 'done' and 'cancelled' fields in different threads.
@@ -63,14 +102,14 @@ private:
   bool m_done;                  // Was the effect completely applied?
   bool m_cancelled;             // Was the effect cancelled by the user?
   bool m_abort;                 // An exception was thrown
-  ui::Timer m_timer;            // Monitoring timer to update the progress-bar
-  AlertPtr m_alertWindow;       // Alert for the user to cancel the filter-progress if he wants.
   std::string m_error;
+#ifdef ENABLE_UI
+  std::unique_ptr<FilterWorkerAlert> m_alert;
+#endif
 };
 
 FilterWorker::FilterWorker(FilterManagerImpl* filterMgr)
   : m_filterMgr(filterMgr)
-  , m_timer(kMonitoringPeriod)
 {
   m_filterMgr->setProgressDelegate(this);
 
@@ -79,29 +118,36 @@ FilterWorker::FilterWorker(FilterManagerImpl* filterMgr)
   m_cancelled = false;
   m_abort = false;
 
-  m_alertWindow = ui::Alert::create(Strings::alerts_applying_filter());
-  m_alertWindow->addProgress();
-
-  m_timer.Tick.connect(&FilterWorker::onMonitoringTick, this);
-  m_timer.start();
+#ifdef ENABLE_UI
+  if (Manager::getDefault())
+    m_alert.reset(new FilterWorkerAlert([this]{ onMonitoringTick(); }));
+#endif
 }
 
 FilterWorker::~FilterWorker()
 {
-  if (m_alertWindow)
-    m_alertWindow->closeWindow(NULL);
+#ifdef ENABLE_UI
+  if (m_alert)
+    m_alert->close();
+#endif
 }
 
 void FilterWorker::run()
 {
-  // Launch the thread to apply the effect in background
-  base::thread thread(&FilterWorker::thread_proxy, this);
-
+#ifdef ENABLE_UI
+  std::thread thread;
   // Open the alert window in foreground (this is modal, locks the main thread)
-  m_alertWindow->openWindowInForeground();
-
-  // Stop the monitoring timer.
-  m_timer.stop();
+  if (m_alert) {
+    // Launch the thread to apply the effect in background
+    thread = std::thread([this]{ applyFilterInBackground(); });
+    m_alert->openAndWait();
+  }
+  else
+#endif // ENABLE_UI
+  {
+    // Without UI? Apply filter from the main thread
+    applyFilterInBackground();
+  }
 
   {
     scoped_lock lock(m_mutex);
@@ -111,8 +157,10 @@ void FilterWorker::run()
       m_cancelled = true;
   }
 
+#ifdef ENABLE_UI
   // Wait the `effect_bg' thread
-  thread.join();
+  if (thread.joinable())
+    thread.join();
 
   if (!m_error.empty()) {
     Console console;
@@ -122,6 +170,7 @@ void FilterWorker::run()
     StatusBar::instance()
       ->showTip(2500, "No unlocked layers to apply filter");
   }
+#endif // ENABLE_UI
 }
 
 // Called by FilterManagerImpl to informate the progress of the filter.
@@ -168,19 +217,24 @@ void FilterWorker::applyFilterInBackground()
   }
 }
 
+#ifdef ENABLE_UI
+
 // Called by the GUI monitor (a timer in the gui module that is called
 // every 100 milliseconds).
 void FilterWorker::onMonitoringTick()
 {
   scoped_lock lock(m_mutex);
 
-  if (m_alertWindow)
-    m_alertWindow->setProgress(m_pos);
+  if (m_alert) {
+    m_alert->setProgress(m_pos);
 
-  if (m_done || m_abort)
-    m_alertWindow->closeWindow(NULL);
+    if (m_done || m_abort)
+      m_alert->close();
+  }
 }
 
+#endif
+
 // Applies the filter in a background thread meanwhile a progress bar
 // is shown to the user.
 //
diff --git a/src/app/site.cpp b/src/app/site.cpp
index 3d6c9473f..2bbdc027a 100644
--- a/src/app/site.cpp
+++ b/src/app/site.cpp
@@ -1,5 +1,6 @@
 // Aseprite
-// Copyright (c) 2001-2018 David Capello
+// Copyright (C) 2019  Igara Studio S.A.
+// Copyright (C) 2001-2018  David Capello
 //
 // This program is distributed under the terms of
 // the End-User License Agreement for Aseprite.
@@ -61,4 +62,14 @@ Palette* Site::palette() const
   return (m_sprite ? m_sprite->palette(m_frame): nullptr);
 }
 
+void Site::range(const DocRange& range)
+{
+  m_range = range;
+  switch (range.type()) {
+    case DocRange::kCels:   m_focus = Site::InCels; break;
+    case DocRange::kFrames: m_focus = Site::InFrames; break;
+    case DocRange::kLayers: m_focus = Site::InLayers; break;
+  }
+}
+
 } // namespace app
diff --git a/src/app/site.h b/src/app/site.h
index da2fd5373..89a881d1a 100644
--- a/src/app/site.h
+++ b/src/app/site.h
@@ -9,9 +9,8 @@
 #define APP_SITE_H_INCLUDED
 #pragma once
 
+#include "app/doc_range.h"
 #include "doc/frame.h"
-#include "doc/selected_frames.h"
-#include "doc/selected_layers.h"
 #include "doc/selected_objects.h"
 
 namespace doc {
@@ -67,24 +66,17 @@ namespace app {
     doc::Sprite* sprite() { return m_sprite; }
     doc::Layer* layer() { return m_layer; }
     doc::Cel* cel();
+    const DocRange& range() const { return m_range; }
 
     void focus(Focus focus) { m_focus = focus; }
     void document(Doc* document) { m_document = document; }
     void sprite(doc::Sprite* sprite) { m_sprite = sprite; }
     void layer(doc::Layer* layer) { m_layer = layer; }
     void frame(doc::frame_t frame) { m_frame = frame; }
+    void range(const DocRange& range);
 
-    const doc::SelectedLayers& selectedLayers() const { return m_selectedLayers; }
-    doc::SelectedLayers& selectedLayers() { return m_selectedLayers; }
-    void selectedLayers(const doc::SelectedLayers& selectedLayers) {
-      m_selectedLayers = selectedLayers;
-    }
-
-    const doc::SelectedFrames& selectedFrames() const { return m_selectedFrames; }
-    doc::SelectedFrames& selectedFrames() { return m_selectedFrames; }
-    void selectedFrames(const doc::SelectedFrames& selectedFrames) {
-      m_selectedFrames = selectedFrames;
-    }
+    const doc::SelectedLayers& selectedLayers() const { return m_range.selectedLayers(); }
+    const doc::SelectedFrames& selectedFrames() const { return m_range.selectedFrames(); }
 
     const doc::SelectedObjects& selectedSlices() const { return m_selectedSlices; }
     doc::SelectedObjects& selectedSlices() { return m_selectedSlices; }
@@ -102,8 +94,7 @@ namespace app {
     doc::Sprite* m_sprite;
     doc::Layer* m_layer;
     doc::frame_t m_frame;
-    doc::SelectedLayers m_selectedLayers;
-    doc::SelectedFrames m_selectedFrames;
+    DocRange m_range;
     doc::SelectedObjects m_selectedSlices;
   };
 
diff --git a/src/app/ui_context.cpp b/src/app/ui_context.cpp
index bd31912ba..1b301c354 100644
--- a/src/app/ui_context.cpp
+++ b/src/app/ui_context.cpp
@@ -291,13 +291,7 @@ void UIContext::onGetActiveSite(Site* site) const
       Timeline* timeline = App::instance()->timeline();
       if (timeline &&
           timeline->range().enabled()) {
-        switch (timeline->range().type()) {
-          case DocRange::kCels:   site->focus(Site::InCels); break;
-          case DocRange::kFrames: site->focus(Site::InFrames); break;
-          case DocRange::kLayers: site->focus(Site::InLayers); break;
-        }
-        site->selectedLayers(timeline->selectedLayers());
-        site->selectedFrames(timeline->selectedFrames());
+        site->range(timeline->range());
       }
       else {
         ColorBar* colorBar = ColorBar::instance();