diff --git a/dres.c b/dres.c
new file mode 100644
index 0000000..d1d8780
--- /dev/null
+++ b/dres.c
@@ -0,0 +1,36 @@
+#include <stdlib.h>
+#include <math.h>
+
+float vcoef(float av, float at, float bv, float bt)
+{
+float dv,dt;
+float f;
+
+#define K 500
+
+dv=av-bv;
+dt=at-bt;
+
+f=dv*dv+dt*dt;
+
+return (1.0/(1.0+K*f));
+}
+
+void dres(
+          float av, float at, float bv, float bt,
+          float cv, float ct, float dv, float dt,
+          float *v , float *t)
+{
+float wab,wac,wda,wbc,wbd,wcd;
+
+wab=vcoef(av,at,bv,bt);
+wac=vcoef(av,at,cv,ct);
+wda=vcoef(dv,dt,av,at);
+wbc=vcoef(bv,bt,cv,ct);
+wbd=vcoef(bv,bt,dv,dt);
+wcd=vcoef(cv,ct,dv,dt);
+
+*v=(wab*(av+bv)+wac*(av+cv)+wda*(dv+av)+wbc*(bv+cv)+wbd*(bv+dv)+wcd*(cv+dv))/(2.0*(wab+wac+wda+wbc+wbd+wcd));
+*t=(wab*(at+bt)+wac*(at+ct)+wda*(dt+at)+wbc*(bt+ct)+wbd*(bt+dt)+wcd*(ct+dt))/(2.0*(wab+wac+wda+wbc+wbd+wcd));
+}
+
diff --git a/main.c b/main.c
index 16c7f21..124315a 100644
--- a/main.c
+++ b/main.c
@@ -32,352 +32,438 @@
 
 #include "version.h"
 
-extern getpixelrow(float *pixelv);
+extern getpixelrow (float *pixelv);
 
 #define SYNC_WIDTH 39
 #define SPC_WIDTH 47
 #define TELE_WIDTH 45
-#define CH_WIDTH  909 
-#define CH_OFFSET  (SYNC_WIDTH+SPC_WIDTH+CH_WIDTH+TELE_WIDTH) 
+#define CH_WIDTH  909
+#define CH_OFFSET  (SYNC_WIDTH+SPC_WIDTH+CH_WIDTH+TELE_WIDTH)
 #define IMG_WIDTH  2080
 
 static SNDFILE *inwav;
-static int initsnd(char *filename)
+static int
+initsnd (char *filename)
 {
-SF_INFO infwav;
+  SF_INFO infwav;
 
 /* open wav input file */
-infwav.format=0;
-inwav=sf_open(filename,SFM_READ,&infwav);
-if (inwav==NULL) {
-	fprintf(stderr,"could not open %s\n",filename);
-	return(1);
-}
-if(infwav.samplerate !=11025) {
-	fprintf(stderr,"Bad Input File sample rate: %d. Must be 11025\n",infwav.samplerate);
-	return(1);
-}
-if(infwav.channels !=1) {
-	fprintf(stderr,"Too many channels in input file : %d\n",infwav.channels);
-	return(1);
-}
-
-return(0);
+  infwav.format = 0;
+  inwav = sf_open (filename, SFM_READ, &infwav);
+  if (inwav == NULL) {
+    fprintf (stderr, "could not open %s\n", filename);
+    return (1);
+  }
+  if (infwav.samplerate != 11025) {
+    fprintf (stderr, "Bad Input File sample rate: %d. Must be 11025\n",
+	     infwav.samplerate);
+    return (1);
+  }
+  if (infwav.channels != 1) {
+    fprintf (stderr, "Too many channels in input file : %d\n",
+	     infwav.channels);
+    return (1);
+  }
+
+  return (0);
 }
 
-int getsample(float *sample,int nb)
+int
+getsample (float *sample, int nb)
 {
-return(sf_read_float(inwav,sample,nb));
+  return (sf_read_float (inwav, sample, nb));
 }
 
-png_text text_ptr[]={
-{ PNG_TEXT_COMPRESSION_NONE, "Software", version ,sizeof(version) },
-{ PNG_TEXT_COMPRESSION_NONE, "Channel", NULL ,0 },
-{ PNG_TEXT_COMPRESSION_NONE, "Description", "NOAA POES satellite Image" ,25 }
+static png_text text_ptr[] = {
+  {PNG_TEXT_COMPRESSION_NONE, "Software", version, sizeof (version)}
+  ,
+  {PNG_TEXT_COMPRESSION_NONE, "Channel", NULL, 0}
+  ,
+  {PNG_TEXT_COMPRESSION_NONE, "Description", "NOAA POES satellite Image", 25}
 };
-static int ImageOut(char *filename,char* chid,float **prow,int nrow,int depth,int width,int offset)
+
+static int
+ImageOut (char *filename, char *chid, float **prow, int nrow, int depth,
+	  int width, int offset)
 {
-FILE *pngfile;
-png_infop info_ptr;
-png_structp png_ptr;
-int n;
+  FILE *pngfile;
+  png_infop info_ptr;
+  png_structp png_ptr;
+  int n;
 
 /* init png lib */
-png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
-if (!png_ptr) {
-	fprintf(stderr,"could not open create png_ptr\n");
-	return(1);
-}
-
-info_ptr = png_create_info_struct(png_ptr);
-    if (!info_ptr) {
-        png_destroy_write_struct(&png_ptr, (png_infopp)NULL);
-	fprintf(stderr,"could not open create info_ptr\n");
-	return(1);
+  png_ptr = png_create_write_struct (PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
+  if (!png_ptr) {
+    fprintf (stderr, "could not open create png_ptr\n");
+    return (1);
+  }
+
+  info_ptr = png_create_info_struct (png_ptr);
+  if (!info_ptr) {
+    png_destroy_write_struct (&png_ptr, (png_infopp) NULL);
+    fprintf (stderr, "could not open create info_ptr\n");
+    return (1);
+  }
+
+  png_set_IHDR (png_ptr, info_ptr, width, nrow,
+		depth, PNG_COLOR_TYPE_GRAY, PNG_INTERLACE_NONE,
+		PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
+
+  text_ptr[1].text = chid;
+  text_ptr[1].text_length = strlen (chid);
+  png_set_text (png_ptr, info_ptr, text_ptr, 3);
+  png_set_pHYs (png_ptr, info_ptr, 4000, 4000, PNG_RESOLUTION_METER);
+
+  printf ("Writing %s ... ", filename);
+  fflush (stdout);
+  pngfile = fopen (filename, "w");
+  if (pngfile == NULL) {
+    fprintf (stderr, "could not open %s\n", filename);
+    return (1);
+  }
+  png_init_io (png_ptr, pngfile);
+  png_write_info (png_ptr, info_ptr);
+
+  for (n = 0; n < nrow; n++) {
+    float *pixelv;
+    png_byte pixel[2 * IMG_WIDTH];
+    int i;
+
+    pixelv = prow[n];
+    for (i = 0; i < width; i++) {
+      float pv;
+
+      pv = pixelv[i + offset];
+      switch (depth) {
+      case 8:
+	pixel[i] = floor (pv);
+	break;
+      case 16:
+	((unsigned short *) pixel)[i] =
+	  htons ((unsigned short) floor (pv * 255.0));
+	break;
+      }
     }
-
-png_set_IHDR(png_ptr, info_ptr, width, nrow,
-       depth, PNG_COLOR_TYPE_GRAY, PNG_INTERLACE_NONE,
-       PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
-
-text_ptr[1].text=chid;
-text_ptr[1].text_length=strlen(chid);
-png_set_text(png_ptr, info_ptr, text_ptr, 3);
-png_set_pHYs(png_ptr, info_ptr, 4000,4000,PNG_RESOLUTION_METER);
-
-printf("Writing %s ... ",filename);fflush(stdout);
-pngfile=fopen(filename,"w");
-if (pngfile==NULL) {
-	fprintf(stderr,"could not open %s\n",filename);
-	return(1);
+    png_write_row (png_ptr, pixel);
+  }
+  png_write_end (png_ptr, info_ptr);
+  fclose (pngfile);
+  printf ("Done\n");
+  png_destroy_write_struct (&png_ptr, &info_ptr);
+  return (0);
 }
-png_init_io(png_ptr,pngfile);
-png_write_info(png_ptr,info_ptr);
-
-for(n=0;n<nrow;n++) {
-	float *pixelv;
-	png_byte pixel[2*IMG_WIDTH];
-	int	i;
-
-	pixelv=prow[n];
-	for(i=0;i<width;i++) {
-		float pv;
-
-		pv=pixelv[i+offset];
-		switch(depth) {
-		case 8 :
-			pixel[i]=floor(pv);
-			break;
-		case 16 :
-			((unsigned short*)pixel)[i]=htons((unsigned short)floor(pv*255.0));
-			break;
-		}
-	}
-	png_write_row(png_ptr,pixel);
-}
-png_write_end(png_ptr,info_ptr);
-fclose(pngfile);
-printf("Done\n");
-png_destroy_write_struct(&png_ptr,&info_ptr);
-return(0);
-} 
-
-int ImageColorOut(char *filename,float **prow,int nrow)
-{
-FILE *pngfile;
-png_infop info_ptr;
-png_structp png_ptr;
-int n;
 
-extern void false_color(double v, double t, float *r, float *g, float *b);
+int
+ImageColorOut (char *filename, float **prow, int nrow)
+{
+  FILE *pngfile;
+  png_infop info_ptr;
+  png_structp png_ptr;
+  int n;
+  float *pixelc,*pixeln,*pixelp;
+  float pv[CH_WIDTH];
+  float pt[CH_WIDTH];
+
+  extern void false_color (double v, double t, float *r, float *g, float *b);
+  extern void dres(
+		float av, float at, float bv, float bt,
+  		float cv, float ct, float dv, float dt,
+		float *v , float *t);
 
 /* init png lib */
-png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
-if (!png_ptr) {
-	fprintf(stderr,"could not open create png_ptr\n");
-	return(1);
-}
+  png_ptr = png_create_write_struct (PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
+  if (!png_ptr) {
+    fprintf (stderr, "could not open create png_ptr\n");
+    return (1);
+  }
+
+  info_ptr = png_create_info_struct (png_ptr);
+  if (!info_ptr) {
+    png_destroy_write_struct (&png_ptr, (png_infopp) NULL);
+    fprintf (stderr, "could not open create info_ptr\n");
+    return (1);
+  }
+
+  png_set_IHDR (png_ptr, info_ptr, 2*CH_WIDTH-3, 2*nrow-3,
+		8, PNG_COLOR_TYPE_RGB, PNG_INTERLACE_NONE,
+		PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
+
+  text_ptr[1].text = "False Colors";
+  png_set_pHYs (png_ptr, info_ptr, 2000, 2000, PNG_RESOLUTION_METER);
+
+  text_ptr[1].text_length = strlen (text_ptr[1].text);
+  png_set_text (png_ptr, info_ptr, text_ptr, 3);
+
+  printf ("Computing False colors & writing : %s ...", filename);
+  fflush (stdout);
+  pngfile = fopen (filename, "w");
+  if (pngfile == NULL) {
+    fprintf (stderr, "could not open %s\n", filename);
+    return (1);
+  }
+  png_init_io (png_ptr, pngfile);
+  png_write_info (png_ptr, info_ptr);
+
+  pixelc=NULL;pixeln=prow[0];
+
+  for (n = 0; n < nrow-1; n++) {
+    png_color pixa[2*CH_WIDTH];
+    png_color pixb[2*CH_WIDTH];
+    int i;
+
+    pixelp=pixelc;pixelc=pixeln;pixeln=prow[n+1];
+
+    for (i = 0; i < CH_WIDTH-1; i++) {
+      float av,bv,cv,dv;
+      float at,bt,ct,dt;
+      float pvc,ptc; 
+      float v,t; 
+      float r, g, b;
+    
+      av = pixelc[i+SYNC_WIDTH + SPC_WIDTH];
+      bv = pixeln[i+SYNC_WIDTH + SPC_WIDTH];
+      cv = pixelc[i+1+SYNC_WIDTH + SPC_WIDTH];
+      dv = pixeln[i+1+SYNC_WIDTH + SPC_WIDTH];
+      if(n!=0) {
+      at = 0.667*pixelc[i+SYNC_WIDTH + SPC_WIDTH + CH_OFFSET]
+           + 0.333*pixelp[i+SYNC_WIDTH + SPC_WIDTH + CH_OFFSET];
+      bt = 0.667*pixeln[i+SYNC_WIDTH + SPC_WIDTH + CH_OFFSET]
+           + 0.333*pixelc[i+SYNC_WIDTH + SPC_WIDTH + CH_OFFSET];
+      ct = 0.667*pixelc[i+1+SYNC_WIDTH + SPC_WIDTH + CH_OFFSET]
+          + 0.333*pixelp[i+1+SYNC_WIDTH + SPC_WIDTH + CH_OFFSET];
+      dt = 0.667*pixeln[i+1+SYNC_WIDTH + SPC_WIDTH + CH_OFFSET]
+           + 0.333*pixelc[i+1+SYNC_WIDTH + SPC_WIDTH + CH_OFFSET];
+      } else  {
+      at = pixelc[i+SYNC_WIDTH + SPC_WIDTH + CH_OFFSET];
+      bt = pixeln[i+SYNC_WIDTH + SPC_WIDTH + CH_OFFSET];
+      ct = pixelc[i+1+SYNC_WIDTH + SPC_WIDTH + CH_OFFSET];
+      dt = pixeln[i+1+SYNC_WIDTH + SPC_WIDTH + CH_OFFSET];
+      }
+
+      dres (av,at,bv,bt,cv,ct,dv,dt,&v,&t);
+
+      falsecolor (v, t, &r, &g, &b);
+      pixb[2*i].red = (unsigned int) (255.0 * r);
+      pixb[2*i].green = (unsigned int) (255.0 * g);
+      pixb[2*i].blue = (unsigned int) (255.0 * b);
+
+      pvc=v;ptc=t;
+
+      if(n!=0) {
+      av = pv[i];
+      bv = pixelc[i+SYNC_WIDTH + SPC_WIDTH];
+      cv = pixelc[i+1+SYNC_WIDTH + SPC_WIDTH];
+      dv = pvc;
+      at = pt[i];
+      bt = 0.667*pixelc[i+SYNC_WIDTH + SPC_WIDTH + CH_OFFSET]
+           + 0.333*pixelp[i+SYNC_WIDTH + SPC_WIDTH + CH_OFFSET];
+      ct = 0.667*pixelc[i+1+SYNC_WIDTH + SPC_WIDTH + CH_OFFSET]
+           + 0.333*pixelp[i+1+SYNC_WIDTH + SPC_WIDTH + CH_OFFSET];
+      dt = ptc;
+
+      dres (av,at,bv,bt,cv,ct,dv,dt,&v,&t);
+
+      falsecolor (v, t, &r, &g, &b);
+      pixa[2*i].red = (unsigned int) (255.0 * r);
+      pixa[2*i].green = (unsigned int) (255.0 * g);
+      pixa[2*i].blue = (unsigned int) (255.0 * b);
+      } 
+      pv[i]=pvc;pt[i]=ptc;
+
+      if (i!=0) {
+
+      if (n!=0) {
+      v = pixelc[i+SYNC_WIDTH + SPC_WIDTH];
+      t = 0.667*pixelc[i+SYNC_WIDTH + SPC_WIDTH + CH_OFFSET]
+           + 0.333*pixelp[i+SYNC_WIDTH + SPC_WIDTH + CH_OFFSET];
+      falsecolor (v, t, &r, &g, &b);
+      pixa[2*i-1].red = (unsigned int) (255.0 * r);
+      pixa[2*i-1].green = (unsigned int) (255.0 * g);
+      pixa[2*i-1].blue = (unsigned int) (255.0 * b);
+      }
+
+      av = pixelc[i+SYNC_WIDTH + SPC_WIDTH];
+      bv = pv[i-1];
+      cv = pvc;
+      dv = pixeln[i+SYNC_WIDTH + SPC_WIDTH];
+      if(n!=0) {
+      at = 0.667*pixelc[i+SYNC_WIDTH + SPC_WIDTH + CH_OFFSET]
+           + 0.333*pixelp[i+SYNC_WIDTH + SPC_WIDTH + CH_OFFSET];
+      dt = 0.667*pixeln[i+SYNC_WIDTH + SPC_WIDTH + CH_OFFSET]
+           + 0.333*pixelc[i+SYNC_WIDTH + SPC_WIDTH + CH_OFFSET];
+      } else {
+      at = pixelc[i+SYNC_WIDTH + SPC_WIDTH + CH_OFFSET];
+      dt = pixeln[i+SYNC_WIDTH + SPC_WIDTH + CH_OFFSET];
+      }
+      bt = pt[i-1];
+      ct = ptc;
+      
+      dres (av,at,bv,bt,cv,ct,dv,dt,&v,&t);
+
+      falsecolor (v, t, &r, &g, &b);
+      pixb[2*i-1].red = (unsigned int) (255.0 * r);
+      pixb[2*i-1].green = (unsigned int) (255.0 * g);
+      pixb[2*i-1].blue = (unsigned int) (255.0 * b);
+      }
 
-info_ptr = png_create_info_struct(png_ptr);
-    if (!info_ptr) {
-        png_destroy_write_struct(&png_ptr, (png_infopp)NULL);
-	fprintf(stderr,"could not open create info_ptr\n");
-	return(1);
     }
-
-png_set_IHDR(png_ptr, info_ptr, CH_WIDTH, nrow,
-       8, PNG_COLOR_TYPE_RGB, PNG_INTERLACE_NONE,
-       PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
-
-text_ptr[1].text="False Colors";
-text_ptr[1].text_length=strlen(text_ptr[1].text);
-png_set_text(png_ptr, info_ptr, text_ptr, 3);
-png_set_pHYs(png_ptr, info_ptr, 4000,4000,PNG_RESOLUTION_METER);
-
-printf("Writing %s ...",filename);fflush(stdout);
-pngfile=fopen(filename,"w");
-if (pngfile==NULL) {
-	fprintf(stderr,"could not open %s\n",filename);
-	return(1);
-}
-png_init_io(png_ptr,pngfile);
-png_write_info(png_ptr,info_ptr);
-
-for(n=0;n<nrow;n++) {
-	float *pixelv;
-	png_color pixel[CH_WIDTH];
-	int	i;
-
-	pixelv=prow[n];
-	for(i=0;i<CH_WIDTH;i++) {
-		double v,t;
-		float r,g,b;
-
-		v=pixelv[i+SYNC_WIDTH+SPC_WIDTH];
-		t=pixelv[i+CH_OFFSET+SYNC_WIDTH+SPC_WIDTH];
-		falsecolor(v,t,&r,&g,&b);
-		pixel[i].red=( unsigned int)(255.0*r);
-		pixel[i].green=( unsigned int)(255.0*g);
-		pixel[i].blue=( unsigned int)(255.0*b);
-	}
-	png_write_row(png_ptr,(png_bytep)pixel);
-}
-png_write_end(png_ptr,info_ptr);
-fclose(pngfile);
-printf("Done\n");
-png_destroy_write_struct(&png_ptr,&info_ptr);
-return(0);
-} 
-
-static int Distrib(char *filename,float **prow,int nrow)
-{
-unsigned int distrib[256][256];
-int n;
-int x,y;
-int max=0;
-FILE *df;
-
-for(y=0;y<256;y++)
-	for(x=0;x<256;x++)
-                distrib[y][x]=0;
-
-for(n=0;n<nrow;n++) {
-        float *pixelv;
-        int     i;
-
-        pixelv=prow[n];
-        for(i=0;i<CH_WIDTH;i++) {
-
-                y=(int)(pixelv[i+SYNC_WIDTH+SPC_WIDTH]);
-                x=(int)(pixelv[i+CH_OFFSET+SYNC_WIDTH+SPC_WIDTH]);
-                distrib[y][x]+=1;
-		if(distrib[y][x]> max) max=distrib[y][x];
-        }
-}
-df=fopen(filename,"w");
-
-printf("Writing %s\n",filename);fflush(stdout);
-
-fprintf(df,"P2\n");
-fprintf(df,"256 256\n255\n");
-for(y=0;y<256;y++)
-	for(x=0;x<256;x++)
-		fprintf(df,"%d\n",(int)((255.0*(double)(distrib[y][x]))/(double)max));
-fclose(df);
+    if(n!=0) png_write_row (png_ptr, (png_bytep) pixa);
+    png_write_row (png_ptr, (png_bytep) pixb);
+
+  }
+  png_write_end (png_ptr, info_ptr);
+  fclose (pngfile);
+  printf ("Done\n");
+  png_destroy_write_struct (&png_ptr, &info_ptr);
+  return (0);
 }
 
-extern int Calibrate(float **prow,int nrow,int offset);
-extern int Temperature(float **prow,int nrow,int ch, int offset);
-extern void readfconf(char *file);
-extern int optind,opterr;
+extern int Calibrate (float **prow, int nrow, int offset);
+extern int Temperature (float **prow, int nrow, int ch, int offset);
+extern void readfconf (char *file);
+extern int optind, opterr;
 extern char *optarg;
-int satnum=1;
+int satnum = 1;
 
-static void usage(void)
+static void
+usage (void)
 {
-	fprintf(stderr,"atpdec [options] soundfiles ...\n");
-	fprintf(stderr,"options:\n-d <dir>\tDestination directory\n-i [a|b|c|t]\tOutput image type\n\t\t\tr: Raw\n\t\t\ta: A chan.\n\t\t\tb: B chan.\n\t\t\tc: False color\n\t\t\tt: Temperature\n-c <file>\tFalse color config file\n-p\t\t16bits output\n-s [0|1]\tSatellite id (for temperature and false color generation)\n\t\t\t0:NOAA15\n\t\t\t1:NOAA17\n");
+  fprintf (stderr, "atpdec [options] soundfiles ...\n");
+  fprintf (stderr,
+	   "options:\n-d <dir>\tDestination directory\n-i [a|b|c|t]\tOutput image type\n\t\t\tr: Raw\n\t\t\ta: A chan.\n\t\t\tb: B chan.\n\t\t\tc: False color\n\t\t\tt: Temperature\n-c <file>\tFalse color config file\n-p\t\t16bits output\n-s [0|1]\tSatellite id (for temperature and false color generation)\n\t\t\t0:NOAA15\n\t\t\t1:NOAA17\n");
 }
 
-main(int argc, char **argv)
+main (int argc, char **argv)
 {
-char pngfilename[1024];
-char name[1024];
-char pngdirname[1024]="";
-char imgopt[20]="ac";
-float *prow[3000];
-char *chid[6]={ "1","2","3A","4","5","3B"};
-int depth=8;
-int n,nrow;
-int ch;
-int c;
-
-printf("%s\n",version);
-
-opterr=0;
-while ((c=getopt(argc,argv,"c:d:i:ps:"))!=EOF) {
-	switch(c) {
-		case 'd':
-			strcpy(pngdirname,optarg);
-			break;
-		case 'c':
-			readfconf(optarg);	
-			break;
-		case 'i':
-			strcpy(imgopt,optarg);
-			break;
-		case 'p':
-			depth=16;
-			break;
-		case 's':
-			satnum=atoi(optarg);
-			if(satnum<0 || satnum > 1) {
-				fprintf(stderr,"invalid satellite\n");
-				exit(1);
-			}
-			break;
-		default:
-			usage();
-	}
-}
+  char pngfilename[1024];
+  char name[1024];
+  char pngdirname[1024] = "";
+  char imgopt[20] = "ac";
+  float *prow[3000];
+  char *chid[6] = { "1", "2", "3A", "4", "5", "3B" };
+  int depth = 8;
+  int n, nrow;
+  int ch;
+  int c;
+
+  printf ("%s\n", version);
+
+  opterr = 0;
+  while ((c = getopt (argc, argv, "c:d:i:ps:")) != EOF) {
+    switch (c) {
+    case 'd':
+      strcpy (pngdirname, optarg);
+      break;
+    case 'c':
+      readfconf (optarg);
+      break;
+    case 'i':
+      strcpy (imgopt, optarg);
+      break;
+    case 'p':
+      depth = 16;
+      break;
+    case 's':
+      satnum = atoi (optarg);
+      if (satnum < 0 || satnum > 1) {
+	fprintf (stderr, "invalid satellite\n");
+	exit (1);
+      }
+      break;
+    default:
+      usage ();
+    }
+  }
 
-for(nrow=0;nrow<3000;nrow++) prow[nrow]=NULL;
+  for (nrow = 0; nrow < 3000; nrow++)
+    prow[nrow] = NULL;
 
-for (;optind<argc;optind++) {
-int a=0,b=0;
+  for (; optind < argc; optind++) {
+    int a = 0, b = 0;
 
-strcpy(pngfilename,argv[optind]);
-strcpy(name,basename(pngfilename));
-strtok(name,".");
-if(pngdirname[0]=='\0') {
-	strcpy(pngfilename,argv[optind]);
-	strcpy(pngdirname,dirname(pngfilename));
-}
+    strcpy (pngfilename, argv[optind]);
+    strcpy (name, basename (pngfilename));
+    strtok (name, ".");
+    if (pngdirname[0] == '\0') {
+      strcpy (pngfilename, argv[optind]);
+      strcpy (pngdirname, dirname (pngfilename));
+    }
 
 /* open snd input */
-if(initsnd(argv[optind]))
-	exit(1);
+    if (initsnd (argv[optind]))
+      exit (1);
 
 /* main loop */
-printf("Decoding: %s \n",argv[optind]);
-for(nrow=0;nrow<3000;nrow++) {
-	if(prow[nrow]==NULL) prow[nrow]=(float*)malloc(sizeof(float)*2150);
-	if(getpixelrow(prow[nrow])==0)
-		break;
-	printf("%d\r",nrow);fflush(stdout);
-} 
-printf("\nDone\n",nrow); 
-sf_close(inwav);
+    printf ("Decoding: %s \n", argv[optind]);
+    for (nrow = 0; nrow < 3000; nrow++) {
+      if (prow[nrow] == NULL)
+	prow[nrow] = (float *) malloc (sizeof (float) * 2150);
+      if (getpixelrow (prow[nrow]) == 0)
+	break;
+      printf ("%d\r", nrow);
+      fflush (stdout);
+    }
+    printf ("\nDone\n", nrow);
+    sf_close (inwav);
 
 /* raw image */
-if(strchr(imgopt,(int)'r')!=NULL){
-sprintf(pngfilename,"%s/%s-r.png",pngdirname,name);
-ImageOut(pngfilename,"raw",prow,nrow,depth,IMG_WIDTH,0);
-}
+    if (strchr (imgopt, (int) 'r') != NULL) {
+      sprintf (pngfilename, "%s/%s-r.png", pngdirname, name);
+      ImageOut (pngfilename, "raw", prow, nrow, depth, IMG_WIDTH, 0);
+    }
 
 /* Channel A */
-if(((strchr(imgopt,(int)'a')!=NULL) || (strchr(imgopt,(int)'c')!=NULL) || (strchr(imgopt,(int)'d')!=NULL))) {
-	ch=Calibrate(prow,nrow,SYNC_WIDTH);
-	if(ch>=0) {
-		if(strchr(imgopt,(int)'a')!=NULL) {
-		sprintf(pngfilename,"%s/%s-%s.png",pngdirname,name,chid[ch]);
-		ImageOut(pngfilename,chid[ch],prow,nrow,depth,SPC_WIDTH+CH_WIDTH+TELE_WIDTH,SYNC_WIDTH);
-		}
+    if (((strchr (imgopt, (int) 'a') != NULL)
+	 || (strchr (imgopt, (int) 'c') != NULL)
+	 || (strchr (imgopt, (int) 'd') != NULL))) {
+      ch = Calibrate (prow, nrow, SYNC_WIDTH);
+      if (ch >= 0) {
+	if (strchr (imgopt, (int) 'a') != NULL) {
+	  sprintf (pngfilename, "%s/%s-%s.png", pngdirname, name, chid[ch]);
+	  ImageOut (pngfilename, chid[ch], prow, nrow, depth,
+		    SPC_WIDTH + CH_WIDTH + TELE_WIDTH, SYNC_WIDTH);
 	}
-	if(ch<2) a=1;
-}
+      }
+      if (ch < 2)
+	a = 1;
+    }
 
 /* Channel B */
-if((strchr(imgopt,(int)'b')!=NULL) || (strchr(imgopt,(int)'c')!=NULL) || (strchr(imgopt,(int)'t')!=NULL) || (strchr(imgopt,(int)'d')!=NULL)) {
-	ch=Calibrate(prow,nrow,CH_OFFSET+SYNC_WIDTH);
-	if(ch>=0) {
-		if(strchr(imgopt,(int)'b')!=NULL) {
-			sprintf(pngfilename,"%s/%s-%s.png",pngdirname,name,chid[ch]);
-			ImageOut(pngfilename,chid[ch],prow,nrow,depth,SPC_WIDTH+CH_WIDTH+TELE_WIDTH,CH_OFFSET+SYNC_WIDTH);
-		}
+    if ((strchr (imgopt, (int) 'b') != NULL)
+	|| (strchr (imgopt, (int) 'c') != NULL)
+	|| (strchr (imgopt, (int) 't') != NULL)
+	|| (strchr (imgopt, (int) 'd') != NULL)) {
+      ch = Calibrate (prow, nrow, CH_OFFSET + SYNC_WIDTH);
+      if (ch >= 0) {
+	if (strchr (imgopt, (int) 'b') != NULL) {
+	  sprintf (pngfilename, "%s/%s-%s.png", pngdirname, name, chid[ch]);
+	  ImageOut (pngfilename, chid[ch], prow, nrow, depth,
+		    SPC_WIDTH + CH_WIDTH + TELE_WIDTH,
+		    CH_OFFSET + SYNC_WIDTH);
 	}
-	if(ch>2) {
-		b=1;
-		Temperature(prow,nrow,ch,CH_OFFSET+SYNC_WIDTH);
-		if(strchr(imgopt,(int)'t')!=NULL) {
-			sprintf(pngfilename,"%s/%s-t.png",pngdirname,name);
-			ImageOut(pngfilename,"Temperature", prow,nrow,depth,CH_WIDTH,CH_OFFSET+SYNC_WIDTH+SPC_WIDTH);
-		}
+      }
+      if (ch > 2) {
+	b = 1;
+	Temperature (prow, nrow, ch, CH_OFFSET + SYNC_WIDTH);
+	if (strchr (imgopt, (int) 't') != NULL) {
+	  sprintf (pngfilename, "%s/%s-t.png", pngdirname, name);
+	  ImageOut (pngfilename, "Temperature", prow, nrow, depth,
+		    CH_WIDTH, CH_OFFSET + SYNC_WIDTH + SPC_WIDTH);
 	}
-}
+      }
+    }
 
 /* distribution */
-if(a && b  && strchr(imgopt,(int)'d')!=NULL){
-	sprintf(pngfilename,"%s/%s-d.pnm",pngdirname,name);
-	Distrib(pngfilename,prow,nrow);
-}
+    if (a && b && strchr (imgopt, (int) 'd') != NULL) {
+      sprintf (pngfilename, "%s/%s-d.pnm", pngdirname, name);
+    }
 
 /* color image */
-if(a && b && strchr(imgopt,(int)'c')!=NULL){
-	sprintf(pngfilename,"%s/%s-c.png",pngdirname,name);
-	ImageColorOut(pngfilename,prow,nrow);
-}
+    if (a && b && strchr (imgopt, (int) 'c') != NULL) {
+      sprintf (pngfilename, "%s/%s-c.png", pngdirname, name);
+      ImageColorOut (pngfilename, prow, nrow);
+    }
 
-}
-exit (0);
+  }
+  exit (0);
 }