diff --git a/doc/the_floatimg_hack.tex b/doc/the_floatimg_hack.tex
index e338bbd..1be7e06 100644
--- a/doc/the_floatimg_hack.tex
+++ b/doc/the_floatimg_hack.tex
@@ -412,7 +412,7 @@ foo = fimg_create_from_dump("lena.fimg", &head);
 \end{lstlisting}
 
 Si la valeur retournée est différente de 0, c'est que quelque
-chose s'est mal passé.
+chose s'est probablement mal passé.
 Certains messages sont parfois  explicites.
 
 % 	_________
diff --git a/funcs/Makefile b/funcs/Makefile
index 147d364..bea3a39 100644
--- a/funcs/Makefile
+++ b/funcs/Makefile
@@ -5,7 +5,7 @@ DEPS = ../floatimg.h Makefile
 OBJS = fimg-png.o fimg-tiff.o misc-plots.o filtrage.o utils.o	\
 	fimg-libpnm.o rampes.o sfx0.o geometry.o rotate.o	\
 	equalize.o fimg-fits.o saturation.o histogram.o		\
-	hsv.o
+	hsv.o classif.o
 
 #---------------------------------------------------------------
 
@@ -58,6 +58,9 @@ sfx0.o:			sfx0.c $(DEPS)
 rampes.o:		rampes.c $(DEPS)
 	gcc $(COPT) -c $<
 
+classif.o:		classif.c $(DEPS)
+	gcc $(COPT) -c $<
+
 hsv.o:		hsv.c $(DEPS)
 	gcc $(COPT) -c $<
 
diff --git a/funcs/classif.c b/funcs/classif.c
new file mode 100644
index 0000000..09f7392
--- /dev/null
+++ b/funcs/classif.c
@@ -0,0 +1,89 @@
+/*
+ *		classif.c
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include   <math.h>
+
+#include "../floatimg.h"
+
+int		verbosity;
+
+/* --------------------------------------------------------------------- */
+/* nouveau 2 octobre 2020, juste avant sonoptic de la pluie craignos	 */
+
+int fimg_classif_trial(FloatImg *psrc, FloatImg *pdst, int notused)
+{
+float		minmax[6], delta[3], baryc[3];
+float		range, dist, rgb[3], dr, dg, db;
+int		x, y, on, off;
+
+#if DEBUG_LEVEL
+fprintf(stderr, ">>> %s ( %p %p %d )\n", __func__, psrc, pdst, notused);
+#endif
+
+/* calculer les amplitudes RGB de l'image source */
+fimg_get_minmax_rgb(psrc, minmax);
+delta[0] = minmax[1] - minmax[0];
+delta[1] = minmax[3] - minmax[2];
+delta[2] = minmax[5] - minmax[4];
+
+/* chercher le plus petit des deltas */
+range = delta[0]; 	if (delta[1]<range) range=delta[1];
+			if (delta[2]<range) range=delta[2];
+
+/* convertir le diametre en rayon (magic inside) */
+range /= 2.0;
+
+fprintf(stderr, "deltas : %f  %f  %f  /  %f\n",
+				delta[0], delta[1], delta[2], range);
+
+
+/* calcul du "barycentre" chromatique */
+baryc[0] = (minmax[1] + minmax[0]) / 2;
+baryc[1] = (minmax[3] + minmax[2]) / 2;
+baryc[2] = (minmax[5] + minmax[4]) / 2;
+fprintf(stderr, "barycs : %f  %f  %f\n", baryc[0], baryc[1], baryc[2]);
+
+on = off = 0;
+
+for (y=0; y<psrc->height; y++) {
+	for (x=0; x<psrc->width; x++) {
+
+		fimg_get_rgb(psrc, x, y, rgb);
+
+		/* calcul de la distance chromatique */
+		dr = rgb[0] - baryc[0];
+		dg = rgb[1] - baryc[1];
+		db = rgb[2] - baryc[2];
+
+		dist = sqrtf( (dr*dr) + (dg*dg) + (db*db) );
+
+#if DEBUG_LEVEL
+	if (x==y) fprintf(stderr, "%4d  %4d   %f\n", x, y, dist);
+#endif
+
+		/* action !!! */
+		if (dist > range) {
+			rgb[0] = 0;		on++;
+			}
+		else	{
+			rgb[1] = 0;		off++;
+			}
+
+		fimg_put_rgb(pdst, x, y, rgb);
+
+		/* MUST BE MORE CREATIVE HERE !!! */
+		}
+	}
+
+fprintf(stderr, "on %d off %d\n", on, off);
+
+return 0;
+}
+
+/* --------------------------------------------------------------------- */
+
+
diff --git a/funcs/t.c b/funcs/t.c
index c8afb2b..94d46f6 100644
--- a/funcs/t.c
+++ b/funcs/t.c
@@ -14,6 +14,44 @@ int		verbosity;
 
 float		global_fvalue;
 
+/* --------------------------------------------------------------------- */
+
+int fimg_classif_trial(FloatImg *src, FloatImg*dst, int notused);
+
+int essai_classif(char *infile)
+{
+FloatImg	src, dst;
+int		foo;
+
+if (NULL != infile) {
+	fprintf(stderr, "%s: loading %s\n", __func__, infile);
+	foo = fimg_create_from_dump(infile, &src);
+	if (foo) {
+		fprintf(stderr, "%s: error loading '%s'\n", __func__, infile);
+		return foo;
+		}
+	}
+else	{
+	fprintf(stderr, "%s : NOT INPUT FILE, FUBAR\n", __func__);
+	abort();
+	}
+
+fimg_clone(&src, &dst, 1);
+
+foo = fimg_classif_trial(&src, &dst, 0);
+if (foo) {
+	fprintf(stderr, "%s: err %d in classif_trial\n", __func__, foo);
+	return foo;
+	}
+
+foo = fimg_save_as_pnm(&dst, "out.pnm", 0);
+if (foo) {
+	fprintf(stderr, "%s : err %d saving result\n", __func__, foo);
+	return foo;
+	}
+
+return foo;
+}
 /* --------------------------------------------------------------------- */
 /* nouveau 19 aout 2020, le matin avant la canicule */
 
@@ -31,7 +69,6 @@ if (foo) {
 	return foo;
 	}
 
-
 return -7;
 }
 /* --------------------------------------------------------------------- */
@@ -434,7 +471,7 @@ return 0;
 }
 /* --------------------------------------------------------------------- */
 enum nCmd { Equalize=1, Rotate, Sfx0, F3x3, MIRE, Wfits, Wpng, Wtiff,
-			Histo, Hsv  };
+			Histo, Hsv,Classif  };
 typedef struct {
 	char	*name;
 	int	Cmd;
@@ -451,6 +488,7 @@ Command commands[] = {
 	{ "wtiff",	Wtiff		},
 	{ "histo",	Histo		},
 	{ "hsv",	Hsv		},
+	{ "classif",	Classif		},
 	{ NULL,		0		}
 	} ;
 
@@ -547,6 +585,9 @@ switch(opt) {
 	case Hsv:
 		foo = fimg_essai_hsv(filename);
 		break;
+	case Classif:
+		foo = essai_classif(filename);
+		break;
 	default:
 		fprintf(stderr, "%s : bad command\n", command);
 		exit(1);