Use WXtoImg precipitation palette

color.c

@@ -78,48 +78,14 @@ char TempPalette[256*3] = {
 	"\xc8\x0\x0\xcc\x0\x0\xcc\x0\x0"
 };
 
-char PrecipPalette[256*3] = {
-	"\xe0\x98\x8\xec\x84\x10\xf5\x70\x1b\xfc\x5c\x29\xff\x49\x38\xff\x37\x4a"
-	"\xfb\x28\x5d\xf5\x1a\x71\xeb\xf\x85\xdf\x8\x99\xd0\x3\xad\xc0\x1\xbf"
-	"\xad\x3\xd0\x9a\x7\xdf\x86\xf\xeb\x72\x1a\xf5\x5e\x27\xfb\x4b\x37\xfe"
-	"\x39\x48\xff\x29\x5b\xfc\x1b\x6f\xf5\x10\x83\xec\x8\x98\xe0\x3\xab\xd2"
-	"\x1\xbe\xc1\x2\xcf\xaf\x7\xdd\x9c\xe\xea\x88\x19\xf4\x73\x26\xfb\x5f"
-	"\x35\xfe\x4c\x47\xff\x3a\x5a\xfc\x2a\x6d\xf6\x1d\x82\xed\x11\x96\xe1\x9"
-	"\xa9\xd3\x3\xbc\xc3\x1\xcd\xb1\x2\xdc\x9e\x6\xe9\x89\xe\xf3\x75\x18"
-	"\xfa\x61\x25\xfe\x4e\x34\xff\x3c\x45\xfc\x2c\x58\xf7\x1e\x6c\xee\x12\x80"
-	"\xe3\x9\x94\xd5\x4\xa8\xc4\x1\xba\xb2\x2\xcc\x9f\x6\xdb\x8b\xd\xe8"
-	"\x77\x17\xf2\x63\x23\xfa\x50\x33\xfe\x3d\x44\xff\x2d\x56\xfd\x1f\x6a\xf7"
-	"\x13\x7e\xef\xa\x92\xe4\x4\xa6\xd6\x1\xb9\xc6\x2\xca\xb4\x5\xda\xa1"
-	"\xc\xe7\x8d\x16\xf1\x79\x22\xf9\x65\x31\xfe\x51\x42\xff\x3f\x54\xfd\x2f"
-	"\x68\xf8\x20\x7c\xf0\x14\x90\xe5\xb\xa4\xd7\x4\xb7\xc7\x1\xc9\xb6\x1"
-	"\xd8\xa3\x5\xe6\x8f\xb\xf1\x7b\x15\xf9\x66\x21\xfd\x53\x30\xff\x41\x40"
-	"\xfd\x30\x53\xf9\x21\x66\xf1\x15\x7a\xe6\xb\x8f\xd9\x5\xa3\xc9\x1\xb6"
-	"\xb7\x1\xc7\xa5\x4\xd7\x91\xb\xe5\x7c\x14\xf0\x68\x20\xf8\x55\x2e\xfd"
-	"\x42\x3f\xff\x31\x51\xfe\x22\x64\xf9\x16\x78\xf2\xc\x8d\xe7\x5\xa1\xda"
-	"\x2\xb4\xca\x1\xc6\xb9\x4\xd6\xa6\xa\xe4\x93\x13\xef\x7e\x1f\xf7\x6a"
-	"\x2d\xfd\x56\x3d\xff\x44\x4f\xfe\x33\x63\xfa\x24\x77\xf2\x17\x8b\xe8\xd"
-	"\x9f\xdb\x6\xb2\xcc\x2\xc4\xbb\x1\xd4\xa8\x4\xe2\x94\x9\xee\x80\x12"
-	"\xf7\x6c\x1d\xfc\x58\x2b\xff\x45\x3c\xfe\x34\x4e\xfa\x25\x61\xf3\x18\x75"
-	"\xe9\xe\x89\xdc\x6\x9d\xcd\x2\xb1\xbc\x1\xc3\xaa\x3\xd3\x96\x9\xe1"
-	"\x82\x11\xed\x6e\x1c\xf6\x5a\x2a\xfc\x47\x3a\xff\x36\x4c\xfe\x26\x5f\xfb"
-	"\x19\x73\xf4\xf\x87\xea\x7\x9b\xde\x2\xaf\xcf\x1\xc1\xbe\x3\xd2\xac"
-	"\x8\xe0\x98\x10\xec\x84\x1b\xf5\x6f\x29\xfc\x5c\x39\xff\x49\x4a\xff\x37"
-	"\x5d\xfb\x28\x71\xf5\x1a\x85\xeb\xf\x9a\xdf\x7\xad\xd0\x3\xbf\xc0\x1"
-	"\xd0\xad\x3\xdf\x9a\x7\xeb\x86\xf\xf5\x71\x1a\xfb\x5d\x27\xff\x4a\x37"
-	"\xff\x39\x49\xfc\x29\x5c\xf5\x1b\x6f\xec\x10\x84\xe0\x8\x98\xd2\x3\xab"
-	"\xc1\x1\xbe\xaf\x2\xcf\x9c\x7\xde\x87\xe\xea\x73\x19\xf4\x5f\x26\xfb"
-	"\x4c\x36\xfe\x3a\x47\xff\x2a\x5a\xfc\x1c\x6e\xf6\x11\x82\xed\x9\x96\xe1"
-	"\x3\xaa\xd3\x1\xbc\xc3\x2\xcd\xb1\x6\xdc\x9d\xe\xe9\x89\x18\xf3\x75"
-	"\x25\xfa\x61\x34\xfe\x4e\x45\xff\x3c\x58\xfc\x2c\x6c\xf7\x1e\x80\xee\x12"
-	"\x94\xe2\x9\xa8\xd4\x4\xbb\xc4\x1\xcc\xb2\x2\xdb\x9f\x6\xe8\x8b\xd"
-	"\xf2\x77\x17\xfa\x63\x24\xfe\x4f\x33\xff\x3d\x44\xfd\x2d\x56\xf7\x1f\x6a"
-	"\xef\x13\x7e\xe4\xa\x92\xd6\x4\xa6\xc6\x1\xb9\xb4\x2\xca\xa1\x5\xda"
-	"\x8d\xc\xe7\x79\x16\xf2\x64\x22\xf9\x51\x31\xfe\x3f\x42\xff\x2e\x55\xfd"
-	"\x20\x68\xf8\x14\x7c\xf0\xb\x91\xe5\x4\xa4\xd7\x1\xb7\xc7\x1\xc9\xb6"
-	"\x5\xd9\xa3\xb\xe6\x8f\x15\xf1\x7a\x21\xf9\x66\x30\xfd\x53\x41\xff\x40"
-	"\x53\xfd\x30\x66\xf9\x21\x7b\xf1\x15\x8f\xe6\xb\xa3\xd8\x5\xb6\xc9\x1"
-	"\xc7\xb7\x1\xd7\xa4\x4\xe5\x91\xb\xf0\x7c\x14\xf8\x68\x20\xfd\x54\x2e"
-	"\xff\x42\x3f\xfe\x31\x51\xf9\x22\x65\xf1\x16\x79\xe7\xc\x8d\xda\x5\xa1"
-	"\xca\x2\xb4\xb9\x1\xc6\xa6\x4\xd6\x92\xa\xe4\x7e\x13\xef\x6a\x1f\xf7"
-	"\x56\x2d\xfd\x44\x3d\xff\x33\x4f\xfe\x24\x63\xfa"
-};
+char PrecipPalette[58*3] = {
+    "\x8\x89\x41\x0\xc5\x44\x0\xd1\x2c\x0\xe3\x1c\x0\xf9\x6\x14\xff\x0\x3e\xff\x0\x5d\xff\x0"
+    "\x80\xff\x0\xab\xff\x0\xcd\xfe\x0\xf8\xff\x0\xff\xe6\x0\xff\xb8\x0\xff\x98\x0"
+    "\xff\x75\x0\xff\x49\x0\xfe\x26\x0\xff\x4\x0\xdf\x0\x0\xa8\x0\x0\x87\x0\x0"
+    "\x5a\x0\x0\x39\x0\x0\x11\x0\x0\xe\x10\x10\x23\x22\x22\x33\x33\x33\x41\x41\x41"
+    "\x53\x53\x53\x60\x60\x60\x6e\x6e\x6e\x80\x80\x80\x8e\x8e\x8e\xa0\xa0\xa0\xae\xae\xae"
+    "\xc0\xc0\xc0\xce\xce\xce\xdc\xdc\xdc\xef\xef\xef\xfa\xfa\xfa\xff\xff\xff\xff\xff\xff"
+    "\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff"
+    "\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff"
+    "\xff\xff\xff"
+};

image.c

@@ -35,7 +35,7 @@ extern void polyreg(const int m, const int n, const double x[], const double y[]
 
 // Compute regression
 static void rgcomp(double x[16], rgparam_t * rgpr) {
-	//				  { 0.106, 0.215, 0.324, 0.433, 0.542,  0.652, 0.78,   0.87,  0.0 }
+	//				    { 0.106, 0.215, 0.324, 0.433, 0.542,  0.652, 0.78,   0.87,  0.0 }
 	const double y[9] = { 31.07, 63.02, 94.96, 126.9, 158.86, 191.1, 228.62, 255.0, 0.0 };
 
 	polyreg(REGORDER, 9, x, y, rgpr->cf);

pngio.c

@@ -386,13 +386,12 @@ int ImageOut(options_t *opts, image_t *img, int offset, int width, char *desc, c
 	if(CONTAINS(opts->type, Palleted))
 		applyUserPalette(img->prow, img->nrow, opts->palette, crow);
 
-	// Precipitation
-	// TODO: use temperature calibration, and a better palette
+	// Precipitation overlay
 	if(CONTAINS(opts->effects, Precipitation_Overlay)){
 		for(int y = 0; y < img->nrow; y++){
 			for(int x = 0; x < CH_WIDTH; x++){
-				if(img->prow[y][x + CHB_OFFSET] > 191)
-					crow[y][x + CHB_OFFSET] = crow[y][x + CHA_OFFSET] = applyPalette(PrecipPalette, img->prow[y][x + CHB_OFFSET]);
+				if(img->prow[y][x + CHB_OFFSET] >= 198)
+					crow[y][x + CHB_OFFSET] = crow[y][x + CHA_OFFSET] = applyPalette(PrecipPalette, img->prow[y][x + CHB_OFFSET]-198);
 			}
 		}
 	}