diff --git a/dsp.c b/dsp.c
index e1b2906..e6a9e61 100755
--- a/dsp.c
+++ b/dsp.c
@@ -214,7 +214,7 @@ int getpixelrow(float *pixelv, int nrow, int *zenith, int reset) {
 	static int npv;
 	static int synced = 0;
 	static double max = 0.0;
-	static double minDoppler = 100, previous = 0;
+	static double minDoppler = 1000000000, previous = 0;
 
 	if(reset) synced = 0;
 
@@ -282,7 +282,7 @@ int getpixelrow(float *pixelv, int nrow, int *zenith, int reset) {
 			mshift = 0;
 		}
 		lastmshift = mshiftOrig;
-        
+
 		// If we are already as aligned as we can get, just continue
 		if (mshift == 0) {
 			synced++;
diff --git a/palettes/WXtoImg-N15-HVCT.png b/palettes/WXtoImg-N15-HVCT.png
deleted file mode 100644
index f5e8926..0000000
Binary files a/palettes/WXtoImg-N15-HVCT.png and /dev/null differ
diff --git a/palettes/WXtoImg-N18-HVCT.png b/palettes/WXtoImg-N18-HVCT.png
deleted file mode 100644
index c9e1db0..0000000
Binary files a/palettes/WXtoImg-N18-HVCT.png and /dev/null differ
diff --git a/palettes/WXtoImg-N19-HVCT.png b/palettes/WXtoImg-N19-HVCT.png
deleted file mode 100644
index 98bd9fd..0000000
Binary files a/palettes/WXtoImg-N19-HVCT.png and /dev/null differ
diff --git a/pngio.c b/pngio.c
index 1365ca2..42607fb 100644
--- a/pngio.c
+++ b/pngio.c
@@ -107,9 +107,10 @@ int mapOverlay(char *filename, rgb_t **crow, int nrow, int zenith, int MCIR) {
 			if(MCIR){
 				if(map.b < 128 && map.g > 128){
 					// Land
+					float darken = ((255-crow[y][chb].r)-100)/50;
 					float green = CLIP(map.g/300, 0, 1);
 					float blue = 0.15 - CLIP(map.b/960.0, 0, 1);
-					crow[y][cha] = (rgb_t){blue*1000, green*98, blue*500.0};
+					crow[y][cha] = (rgb_t){blue*1000*darken, green*98*darken, blue*500.0*darken};
 				}else{
 					// Sea
 					crow[y][cha] = (rgb_t){9, 17, 74};
@@ -123,6 +124,10 @@ int mapOverlay(char *filename, rgb_t **crow, int nrow, int zenith, int MCIR) {
 			map.r *= factor/257.0; map.g *= factor/257.0; map.b *= factor/257.0;
 			// Color -> alpha: convert black to alpha
 			float alpha = CLIP(composite / 65535.0, 0, 1);
+			// Clip
+			map.r = CLIP(map.r, 0, 255.0);
+			map.g = CLIP(map.g, 0, 255.0);
+			map.b = CLIP(map.b, 0, 255.0);
 
 			// Map overlay on channel A
 			crow[y][cha] = RGBcomposite(map, alpha, crow[y][cha], 1);
@@ -132,8 +137,8 @@ int mapOverlay(char *filename, rgb_t **crow, int nrow, int zenith, int MCIR) {
 
 			// Cloud overlay on channel A
 			if(MCIR){
-				float cloud = CLIP((crow[y][chb].r - 105) / 150, 0, 1);
-				crow[y][cha] = RGBcomposite((rgb_t){240, 250, 255}, cloud, crow[y][cha], 1);
+				float cloud = CLIP((crow[y][chb].r - 113) / 90.0, 0, 1);
+				crow[y][cha] = RGBcomposite((rgb_t){255, 250, 245}, cloud, crow[y][cha], 1);
 			}
 		}
 	}