diff --git a/rtengine/FTblockDN.cc b/rtengine/FTblockDN.cc
index caaf633ec..8a61f7a6e 100644
--- a/rtengine/FTblockDN.cc
+++ b/rtengine/FTblockDN.cc
@@ -161,7 +161,7 @@ namespace rtengine {
 		
 		//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 		//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-		// begin block processing of image
+		// begin tile processing of image
 		
 		//output buffer
 		Imagefloat * dsttmp = new Imagefloat(imwidth,imheight);
@@ -194,8 +194,9 @@ namespace rtengine {
 			tileheight += (tileheight&1);
 			tileHskip = tileheight-overlap;
 		}
+		//now we have tile dimensions, overlaps
+		//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 
-		
 #pragma omp parallel for schedule(dynamic)
 		
 		for (int tiletop=0; tiletop<imheight; tiletop+=tileHskip) {
@@ -206,11 +207,13 @@ namespace rtengine {
 				int width  = tileright-tileleft;
 				int height = tilebottom-tiletop;
 				
-				
-				//LabImage * labin = new LabImage(width,height);
+				//input L channel
+				array2D<float> Lin(width,height);
+				//wavelet denoised image
 				LabImage * labdn = new LabImage(width,height);
+				//residual between input and denoised L channel
 				array2D<float> Ldetail(width,height);
-				
+
 #ifdef _OPENMP
 #pragma omp parallel for
 #endif
@@ -231,13 +234,9 @@ namespace rtengine {
 						labdn->b[i1][j1] = (Y-Z);
 						
 						Ldetail[i1][j1] = 0;
-						
+						Lin[i1][j1] = Y;
 					}
 				
-				array2D<float> Lin(width,height);
-				float * Linptr = Lin;
-				memcpy (Linptr, labdn->data, width*height*sizeof(float));
-				
 				//initial impulse denoise
 				impulse_nr (labdn, 50.0f/20.0f);
 				
@@ -267,6 +266,7 @@ namespace rtengine {
 				impulse_nr (labdn, 50.0f/20.0f);
 				//PF_correct_RT(dst, dst, defringe.radius, defringe.threshold);
 				
+				//wavelet denoised L channel
 				array2D<float> Lwavdn(width,height,ARRAY2D_CLEAR_DATA);
 				float * Lwavdnptr = Lwavdn;
 				memcpy (Lwavdnptr, labdn->data, width*height*sizeof(float));
@@ -277,6 +277,7 @@ namespace rtengine {
 				// missed by wavelet denoise
 				// blocks are not the same thing as tiles!
 				
+				//pixel weight
 				array2D<float> totwt(width,height,ARRAY2D_CLEAR_DATA);//weight for combining blocks
 				
 				// allocate DCT data structures
@@ -287,6 +288,7 @@ namespace rtengine {
 				//const int nrtiles = numblox_W*numblox_H;
 				// end of tiling calc
 				
+				//DCT block data storage
 				float * Lblox  = (float *) fftwf_malloc (numblox_W*TS*TS * sizeof (float));
 				float * fLblox = (float *) fftwf_malloc (numblox_W*TS*TS * sizeof (float));
 				
@@ -296,7 +298,6 @@ namespace rtengine {
 				
 				int nfwd[2]={TS,TS};
 				
-				
 				//for DCT:
 				const fftw_r2r_kind fwdkind[2] = {FFTW_REDFT10, FFTW_REDFT10};
 				const fftw_r2r_kind bwdkind[2] = {FFTW_REDFT01, FFTW_REDFT01};
@@ -405,6 +406,7 @@ namespace rtengine {
 				//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 				// transform denoised "Lab" to output RGB
 				
+				//calculate mask for feathering output tile overlaps
 				float * Vmask = new float [height];
 				float * Hmask = new float [width];
 
@@ -455,7 +457,6 @@ namespace rtengine {
 				
 				//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 				
-				//delete labin;
 				delete labdn;
 				
 				
diff --git a/rtengine/procparams.cc b/rtengine/procparams.cc
index 493a965d3..ca8a07bb9 100644
--- a/rtengine/procparams.cc
+++ b/rtengine/procparams.cc
@@ -216,10 +216,10 @@ void ProcParams::setDefaults () {
     defringe.threshold          = 25;
 
     dirpyrDenoise.enabled       = false;
-    dirpyrDenoise.luma          = 10;
-    dirpyrDenoise.Ldetail       = 10;
-    dirpyrDenoise.chroma        = 10;
-    dirpyrDenoise.gamma         = 2.0;
+    dirpyrDenoise.luma          = 20;
+    dirpyrDenoise.Ldetail       = 50;
+    dirpyrDenoise.chroma        = 20;
+    dirpyrDenoise.gamma         = 1.7;
 	dirpyrDenoise.expcomp       = 0.0;
 
 	edgePreservingDecompositionUI.enabled = false;
@@ -478,9 +478,9 @@ int ProcParams::save (Glib::ustring fname, Glib::ustring fname2, ParamsEdited* p
 
     // save dirpyrDenoise
     if (!pedited || pedited->dirpyrDenoise.enabled) keyFile.set_boolean ("Directional Pyramid Denoising", "Enabled", dirpyrDenoise.enabled);
-    if (!pedited || pedited->dirpyrDenoise.luma)    keyFile.set_integer ("Directional Pyramid Denoising", "Luma",    dirpyrDenoise.luma);
-    if (!pedited || pedited->dirpyrDenoise.luma)    keyFile.set_integer ("Directional Pyramid Denoising", "Ldetail", dirpyrDenoise.Ldetail);
-    if (!pedited || pedited->dirpyrDenoise.chroma)  keyFile.set_integer ("Directional Pyramid Denoising", "Chroma",  dirpyrDenoise.chroma);
+    if (!pedited || pedited->dirpyrDenoise.luma)    keyFile.set_double ("Directional Pyramid Denoising", "Luma",    dirpyrDenoise.luma);
+    if (!pedited || pedited->dirpyrDenoise.Ldetail) keyFile.set_double ("Directional Pyramid Denoising", "Ldetail", dirpyrDenoise.Ldetail);
+    if (!pedited || pedited->dirpyrDenoise.chroma)  keyFile.set_double ("Directional Pyramid Denoising", "Chroma",  dirpyrDenoise.chroma);
     if (!pedited || pedited->dirpyrDenoise.gamma)   keyFile.set_double  ("Directional Pyramid Denoising", "Gamma",   dirpyrDenoise.gamma);
 
     //Save edgePreservingDecompositionUI.
@@ -856,9 +856,9 @@ if (keyFile.has_group ("Impulse Denoising")) {
 if (keyFile.has_group ("Directional Pyramid Denoising")) {//TODO: No longer an accurate description for FT denoise
 	if (keyFile.has_key ("Directional Pyramid Denoising", "Enabled"))    { dirpyrDenoise.enabled = keyFile.get_boolean ("Directional Pyramid Denoising", "Enabled"); if (pedited) pedited->dirpyrDenoise.enabled = true; }
 	if (keyFile.has_key ("Directional Pyramid Denoising", "Luma"))       { dirpyrDenoise.luma    = keyFile.get_double ("Directional Pyramid Denoising", "Luma"); if (pedited) pedited->dirpyrDenoise.luma = true; }
-	if (keyFile.has_key ("Directional Pyramid Denoising", "Ldetail"))       { dirpyrDenoise.luma    = keyFile.get_double ("Directional Pyramid Denoising", "Ldetail"); if (pedited) pedited->dirpyrDenoise.Ldetail = true; }
+	if (keyFile.has_key ("Directional Pyramid Denoising", "Ldetail"))    { dirpyrDenoise.Ldetail = keyFile.get_double ("Directional Pyramid Denoising", "Ldetail"); if (pedited) pedited->dirpyrDenoise.Ldetail = true; }
 	if (keyFile.has_key ("Directional Pyramid Denoising", "Chroma"))     { dirpyrDenoise.chroma  = keyFile.get_double ("Directional Pyramid Denoising", "Chroma"); if (pedited) pedited->dirpyrDenoise.chroma = true; }
-	if (keyFile.has_key ("Directional Pyramid Denoising", "Gamma"))      { dirpyrDenoise.gamma  = keyFile.get_double ("Directional Pyramid Denoising", "Gamma"); if (pedited) pedited->dirpyrDenoise.gamma = true; }
+	if (keyFile.has_key ("Directional Pyramid Denoising", "Gamma"))      { dirpyrDenoise.gamma   = keyFile.get_double ("Directional Pyramid Denoising", "Gamma"); if (pedited) pedited->dirpyrDenoise.gamma = true; }
 }
 
 //Load EPD.