diff --git a/tools/fimg2text.c b/tools/fimg2text.c
index 18f1e1c..1dc8007 100644
--- a/tools/fimg2text.c
+++ b/tools/fimg2text.c
@@ -1,5 +1,6 @@
 /*
  *	converting a floatimg to a machinable text file
+ *	an ugly software from tTh - february 2021
  */
 
 #include  <stdio.h>
@@ -46,7 +47,37 @@ for (y=0; y<src->height; y+=steps) {
 return 0;
 }
 /* ------------------------------------------------------------------------- */
-int convertir_fimg_en_machinable(char *srcname, char *dstname, int steps)
+static int normalize(FloatImg *pimg, float vmax)
+{
+float		mmv[6], maxi, coef;
+int		foo, sz, idx;
+
+// #if DEBUG_LEVEL
+fprintf(stderr, ">>> %s ( %p %g )\n", __func__, pimg, vmax);
+// #endif
+
+foo = fimg_get_minmax_rgb(pimg, mmv);
+fimg_print_minmax(mmv, "norm it ?");
+			maxi = mmv[1];
+if (mmv[3] > maxi)	maxi = mmv[3];
+if (mmv[5] > maxi)	maxi = mmv[5];
+fprintf(stderr, "maximum = %f\n", maxi);
+coef = vmax / maxi;
+fprintf(stderr, "coef    = %f\n", coef);
+
+sz = pimg->width * pimg->height;
+
+for (idx=0; idx<sz; idx++) {
+	pimg->R[idx] *= coef;
+	pimg->G[idx] *= coef;
+	pimg->B[idx] *= coef;
+	}
+
+return 0;
+}
+/* ------------------------------------------------------------------------- */
+int convertir_fimg_en_machinable(char *srcname, char *dstname,
+					int steps, float norm)
 {
 int		foo, infos[3];
 FloatImg	fimg;
@@ -78,6 +109,10 @@ if (foo) {
 if (verbosity) {
 	fimg_describe(&fimg, srcname);
 	}
+if (norm > 0.0) {
+	fprintf(stderr, "normalize %p\n", &fimg);
+	foo = normalize(&fimg, norm);
+	}
 
 foo = export_as_machinable(&fimg, dstname, steps, 0);
 
@@ -88,12 +123,12 @@ return 0;
 /* ------------------------------------------------------------------------- */
 void help(int k)
 {
-
 puts("usage:\n\tfimg2text [options] foo.fimg > bar.csv");
 puts("options:");
 puts("\t-v\tincrease verbosity");
+puts("\t-n 3.14\tnormalize picture");
+puts("\t-s N\nsteps on x & y");
 if (verbosity) fimg_print_version(1);
-
 exit(0);
 }
 /* ------------------------------------------------------------------------- */
@@ -102,12 +137,14 @@ int main(int argc, char *argv[])
 {
 int		foo, opt;
 int		steps = 16;
+float		norm_val = 222.0;	/* < 0 : don't normalize */
 
 while ((opt = getopt(argc, argv, "hs:v")) != -1) {
 	switch(opt) {
-		case 'v':	verbosity++;		break;
-		case 'h':	help(1);		exit(1);
-		case 's':	steps = atoi(optarg);	break;
+		case 'v':	verbosity++;			break;
+		case 'h':	help(1);			exit(1);
+		case 's':	steps = atoi(optarg);		break;
+		case 'n':	norm_val = atof(optarg);	break;
 		}
 	}
 
@@ -116,7 +153,7 @@ if (1 != argc-optind) {
 	exit(1);
 	}
 
-foo = convertir_fimg_en_machinable(argv[optind], "-", steps);
+foo = convertir_fimg_en_machinable(argv[optind], "-", steps, norm_val);
 if (foo)
 	fprintf(stderr, "%s : got a %d from convertor\n", argv[0], foo);