diff --git a/funcs/Makefile b/funcs/Makefile
index edc0db8..67f3b62 100644
--- a/funcs/Makefile
+++ b/funcs/Makefile
@@ -4,7 +4,7 @@ COPT = -Wall -fpic -g -no-pie -DDEBUG_LEVEL=0
 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
+	equalize.o fimg-fits.o saturation.o histogram.o
 
 #---------------------------------------------------------------
 
@@ -45,6 +45,9 @@ rotate.o:		rotate.c $(DEPS)
 saturation.o:		saturation.c $(DEPS)
 	gcc $(COPT) -c $<
 
+histogram.o:		histogram.c $(DEPS)
+	gcc $(COPT) -c $<
+
 equalize.o:		equalize.c $(DEPS)
 	gcc $(COPT) -c $<
 
diff --git a/funcs/equalize.c b/funcs/equalize.c
index b0b1599..9c0465e 100644
--- a/funcs/equalize.c
+++ b/funcs/equalize.c
@@ -34,9 +34,9 @@ dr = minmax[1] - minmax[0];
 dg = minmax[3] - minmax[2];
 db = minmax[5] - minmax[4];
 
-printf("Rmin  %12.4g    Rmax  %12.4g    delta %12.4g\n", minmax[0], minmax[1], dr);
-printf("Gmin  %12.4g    Gmax  %12.4g    delta %12.4g\n", minmax[2], minmax[3], dg);
-printf("Bmin  %12.4g    Bmax  %12.4g    delta %12.4g\n", minmax[4], minmax[5], db);
+printf("Rmin  %12.4g    Rmax  %12.4g    delta  %12.4g\n", minmax[0], minmax[1], dr);
+printf("Gmin  %12.4g    Gmax  %12.4g    delta  %12.4g\n", minmax[2], minmax[3], dg);
+printf("Bmin  %12.4g    Bmax  %12.4g    delta  %12.4g\n", minmax[4], minmax[5], db);
 
 if ( (minmax[0]<0.0) || (minmax[2]<0.0) || (minmax[4]<0.0) ) {
 	fprintf(stderr, "%s: negative value ?\n", __func__);
diff --git a/funcs/t.c b/funcs/t.c
index ae5496d..cd024b0 100644
--- a/funcs/t.c
+++ b/funcs/t.c
@@ -401,7 +401,36 @@ fprintf(stderr, "save as png -> %d\n", foo);
 return 0;
 }
 /* --------------------------------------------------------------------- */
-enum nCmd { Equalize=1, Rotate, Sfx0, F3x3, MIRE, Wfits, Wpng, Wtiff };
+
+		/* func in histogram.c */
+int fimg_essai_histo(FloatImg *src, char *outpic, int k);
+
+
+int essai_histogramme(char *fname, int k)
+{
+FloatImg	fimg;
+int		foo;
+fprintf(stderr, ">>> %s ( '%s' %d )\n", __func__, fname, k);
+
+foo = fimg_create_from_dump(fname, &fimg);
+if (foo) {
+	fprintf(stderr, "%s: err load '%s'\n", __func__, fname);
+	return foo;
+	}
+
+foo = fimg_essai_histo(&fimg, "out.png", k);
+if (foo) {
+	fprintf(stderr, "essai_histo -> %d\n", foo);
+	return foo;
+	}
+
+fprintf(stderr, "\\o/ end of %s\n", __func__);
+
+return -1;
+}
+/* --------------------------------------------------------------------- */
+enum nCmd { Equalize=1, Rotate, Sfx0, F3x3, MIRE, Wfits, Wpng, Wtiff,
+			Histo  };
 typedef struct {
 	char	*name;
 	int	Cmd;
@@ -416,6 +445,7 @@ Command commands[] = {
 	{ "wfits",	Wfits		},
 	{ "wpng",	Wpng		},
 	{ "wtiff",	Wtiff		},
+	{ "histo",	Histo		},
 	{ NULL,		0		}
 	} ;
 
@@ -506,6 +536,9 @@ switch(opt) {
 	case Wtiff:
 		foo = essai_ecriture_tiff(filename);
 		break;
+	case Histo:
+		foo = essai_histogramme(filename, 0);
+		break;
 	default:
 		fprintf(stderr, "%s : bad command\n", command);
 		exit(1);