diff --git a/rtgui/preprocesswb.h b/rtgui/preprocesswb.h
@@ -0,0 +1,47 @@
+/*
+ *  This file is part of RawTherapee.
+ *
+ *  Copyright (c) 2020 Alberto Romei <aldrop8@gmail.com>
+ *
+ *  RawTherapee is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  RawTherapee is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with RawTherapee.  If not, see <https://www.gnu.org/licenses/>.
+ */
+#pragma once
+
+#include <gtkmm.h>
+
+#include "adjuster.h"
+#include "toolpanel.h"
+
+class PreprocessWB final:
+    public ToolParamBlock,
+    public FoldableToolPanel
+{
+
+private:
+    const rtengine::ProcEvent evPreprocessWBMode;
+
+    MyComboBoxText* mode;
+
+public:
+
+    PreprocessWB();
+
+    void read(const rtengine::procparams::ProcParams* pp, const ParamsEdited* pedited = nullptr) override;
+    void write(rtengine::procparams::ProcParams* pp, ParamsEdited* pedited = nullptr) override;
+    void setBatchMode(bool batchMode) override;
+    void setDefaults(const rtengine::procparams::ProcParams* defParams, const ParamsEdited* pedited = nullptr) override;
+    void setAdjusterBehavior(bool add);
+    void trimValues(rtengine::procparams::ProcParams* pp) override;
+    void modeChanged();
+};
diff --git a/rtgui/toolpanelcoord.cc b/rtgui/toolpanelcoord.cc
@@ -92,6 +92,7 @@ ToolPanelCoordinator::ToolPanelCoordinator (bool batch) : ipc (nullptr), favorit
     flatfield           = Gtk::manage (new FlatField ());
     rawcacorrection     = Gtk::manage (new RAWCACorr ());
     rawexposure         = Gtk::manage (new RAWExposure ());
+    preprocessWB        = Gtk::manage (new PreprocessWB ());
     bayerrawexposure    = Gtk::manage (new BayerRAWExposure ());
     xtransrawexposure   = Gtk::manage (new XTransRAWExposure ());
     fattal              = Gtk::manage (new FattalToneMapping ());
@@ -155,6 +156,7 @@ ToolPanelCoordinator::ToolPanelCoordinator (bool batch) : ipc (nullptr), favorit
     addfavoritePanel (sensorxtrans->getPackBox(), xtransprocess, 2);
     addfavoritePanel (sensorxtrans->getPackBox(), xtransrawexposure, 2);
     addfavoritePanel (rawPanel, rawexposure);
+    addfavoritePanel (rawPanel, preprocessWB);
     addfavoritePanel (rawPanel, preprocess);
     addfavoritePanel (rawPanel, darkframe);
     addfavoritePanel (rawPanel, flatfield);
@@ -357,6 +359,7 @@ void ToolPanelCoordinator::imageTypeChanged (bool isRaw, bool isBayer, bool isXt
                     sensorxtrans->FoldableToolPanel::hide();
                     xtransprocess->FoldableToolPanel::hide();
                     xtransrawexposure->FoldableToolPanel::hide();
+                    preprocessWB->FoldableToolPanel::hide();
                     preprocess->FoldableToolPanel::hide();
                     flatfield->FoldableToolPanel::show();
                     filmNegative->FoldableToolPanel::hide();
@@ -377,6 +380,7 @@ void ToolPanelCoordinator::imageTypeChanged (bool isRaw, bool isBayer, bool isXt
                     sensorxtrans->FoldableToolPanel::hide();
                     xtransprocess->FoldableToolPanel::hide();
                     xtransrawexposure->FoldableToolPanel::hide();
+                    preprocessWB->FoldableToolPanel::hide();
                     preprocess->FoldableToolPanel::hide();
                     flatfield->FoldableToolPanel::hide();
                     filmNegative->FoldableToolPanel::hide();
@@ -398,6 +402,7 @@ void ToolPanelCoordinator::imageTypeChanged (bool isRaw, bool isBayer, bool isXt
                 sensorxtrans->FoldableToolPanel::hide();
                 xtransprocess->FoldableToolPanel::hide();
                 xtransrawexposure->FoldableToolPanel::hide();
+                preprocessWB->FoldableToolPanel::hide();
                 preprocess->FoldableToolPanel::hide();
                 flatfield->FoldableToolPanel::hide();
                 filmNegative->FoldableToolPanel::hide();

diff --git a/rtgui/toolpanelcoord.h b/rtgui/toolpanelcoord.h
@@ -59,6 +59,7 @@
 #include "perspective.h"
 #include "pparamschangelistener.h"
 #include "preprocess.h"
+#include "preprocesswb.h"
 #include "profilechangelistener.h"
 #include "prsharpening.h"
 #include "rawcacorrection.h"
@@ -155,6 +156,7 @@ class ToolPanelCoordinator :
     FlatField* flatfield;
     RAWCACorr* rawcacorrection;
     RAWExposure* rawexposure;
+    PreprocessWB* preprocessWB;
     BayerRAWExposure* bayerrawexposure;
     XTransRAWExposure* xtransrawexposure;
     FattalToneMapping *fattal;