diff --git a/rtengine/improcfun.cc b/rtengine/improcfun.cc
index c87d4edd4..9cc3e7d28 100644
--- a/rtengine/improcfun.cc
+++ b/rtengine/improcfun.cc
@@ -7064,7 +7064,7 @@ double ImProcFunctions::getAutoDistor  (const Glib::ustring &fname, int thumb_si
             return 0.0;
         }
 
-        Thumbnail* raw =   rtengine::Thumbnail::loadFromRaw      (fname, ri, sensorType, w_raw, h_raw, 1, 1.0, FALSE, 0);
+        Thumbnail* raw =   rtengine::Thumbnail::loadFromRaw      (fname, ri, sensorType, w_raw, h_raw, 1, 1.0, FALSE);
 
         if (!raw) {
             delete thumb;
diff --git a/rtengine/rtthumbnail.cc b/rtengine/rtthumbnail.cc
index c790c9378..b458464b8 100644
--- a/rtengine/rtthumbnail.cc
+++ b/rtengine/rtthumbnail.cc
@@ -381,7 +381,7 @@ RawMetaDataLocation Thumbnail::loadMetaDataFromRaw (const Glib::ustring& fname)
     return rml;
 }
 
-Thumbnail* Thumbnail::loadFromRaw (const Glib::ustring& fname, RawMetaDataLocation& rml, eSensorType &sensorType, int &w, int &h, int fixwh, double wbEq, bool rotate, int imageNum)
+Thumbnail* Thumbnail::loadFromRaw (const Glib::ustring& fname, RawMetaDataLocation& rml, eSensorType &sensorType, int &w, int &h, int fixwh, double wbEq, bool rotate)
 {
     RawImage *ri = new RawImage (fname);
     unsigned int tempImageNum = 0;
@@ -929,7 +929,7 @@ Thumbnail::~Thumbnail ()
 }
 
 // Simple processing of RAW internal JPGs
-IImage8* Thumbnail::quickProcessImage (const procparams::ProcParams& params, int rheight, rtengine::TypeInterpolation interp, double& myscale)
+IImage8* Thumbnail::quickProcessImage (const procparams::ProcParams& params, int rheight, rtengine::TypeInterpolation interp)
 {
 
     int rwidth;
@@ -1761,7 +1761,7 @@ unsigned char* Thumbnail::getGrayscaleHistEQ (int trim_width)
     return tmpdata;
 }
 
-bool Thumbnail::writeImage (const Glib::ustring& fname, int format)
+bool Thumbnail::writeImage (const Glib::ustring& fname)
 {
 
     if (!thumbImg) {
diff --git a/rtengine/rtthumbnail.h b/rtengine/rtthumbnail.h
index 4987cc88c..2ee08de50 100644
--- a/rtengine/rtthumbnail.h
+++ b/rtengine/rtthumbnail.h
@@ -72,12 +72,12 @@ public:
     void init ();
 
     IImage8* processImage   (const procparams::ProcParams& pparams, eSensorType sensorType, int rheight, TypeInterpolation interp, const FramesMetaData *metadata, double& scale);
-    IImage8* quickProcessImage   (const procparams::ProcParams& pparams, int rheight, TypeInterpolation interp, double& scale);
+    IImage8* quickProcessImage   (const procparams::ProcParams& pparams, int rheight, TypeInterpolation interp);
     int      getImageWidth  (const procparams::ProcParams& pparams, int rheight, float &ratio);
     void     getDimensions  (int& w, int& h, double& scaleFac);
 
     static Thumbnail* loadQuickFromRaw (const Glib::ustring& fname, rtengine::RawMetaDataLocation& rml, eSensorType &sensorType, int &w, int &h, int fixwh, bool rotate, bool inspectorMode = false);
-    static Thumbnail* loadFromRaw (const Glib::ustring& fname, RawMetaDataLocation& rml, eSensorType &sensorType, int &w, int &h, int fixwh, double wbEq, bool rotate, int imageNum);
+    static Thumbnail* loadFromRaw (const Glib::ustring& fname, RawMetaDataLocation& rml, eSensorType &sensorType, int &w, int &h, int fixwh, double wbEq, bool rotate);
     static Thumbnail* loadFromImage (const Glib::ustring& fname, int &w, int &h, int fixwh, double wbEq, bool inspectorMode = false);
     static RawMetaDataLocation loadMetaDataFromRaw (const Glib::ustring& fname);
 
@@ -88,7 +88,7 @@ public:
     void applyAutoExp (procparams::ProcParams& pparams);
 
     unsigned char* getGrayscaleHistEQ (int trim_width);
-    bool writeImage (const Glib::ustring& fname, int format);
+    bool writeImage (const Glib::ustring& fname);
     bool readImage (const Glib::ustring& fname);
 
     bool readData  (const Glib::ustring& fname);
diff --git a/rtgui/thumbnail.cc b/rtgui/thumbnail.cc
index de02be130..bfb1b8797 100644
--- a/rtgui/thumbnail.cc
+++ b/rtgui/thumbnail.cc
@@ -140,7 +140,7 @@ void Thumbnail::_generateThumbnailImage ()
 
         if ( tpp == nullptr ) {
             quick = false;
-            tpp = rtengine::Thumbnail::loadFromRaw (fname, ri, sensorType, tw, th, 1, pparams.wb.equal, TRUE, pparams.raw.bayersensor.imageNum);
+            tpp = rtengine::Thumbnail::loadFromRaw (fname, ri, sensorType, tw, th, 1, pparams.wb.equal, TRUE);
         }
 
         cfs.sensortype = sensorType;
@@ -612,7 +612,7 @@ rtengine::IImage8* Thumbnail::processThumbImage (const rtengine::procparams::Pro
 
     if ( cfs.thumbImgType == CacheImageData::QUICK_THUMBNAIL ) {
         // RAW internal thumbnail, no profile yet: just do some rotation etc.
-        image = tpp->quickProcessImage (pparams, h, rtengine::TI_Nearest, scale);
+        image = tpp->quickProcessImage (pparams, h, rtengine::TI_Nearest);
     } else {
         // Full thumbnail: apply profile
         // image = tpp->processImage (pparams, h, rtengine::TI_Bilinear, cfs.getCamera(), cfs.focalLen, cfs.focalLen35mm, cfs.focusDist, cfs.shutter, cfs.fnumber, cfs.iso, cfs.expcomp, scale );
@@ -883,7 +883,7 @@ void Thumbnail::_saveThumbnail ()
     }
 
     // save thumbnail image
-    tpp->writeImage (getCacheFileName ("images", ""), 1);
+    tpp->writeImage (getCacheFileName ("images", ""));
 
     // save aehistogram
     tpp->writeAEHistogram (getCacheFileName ("aehistograms", ""));