diff --git a/funcs/Makefile b/funcs/Makefile
index 67f3b62b..147d364f 100644
--- a/funcs/Makefile
+++ b/funcs/Makefile
@@ -4,7 +4,8 @@ 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 histogram.o
+	equalize.o fimg-fits.o saturation.o histogram.o		\
+	hsv.o
 
 #---------------------------------------------------------------
 
@@ -57,5 +58,8 @@ sfx0.o:			sfx0.c $(DEPS)
 rampes.o:		rampes.c $(DEPS)
 	gcc $(COPT) -c $<
 
+hsv.o:		hsv.c $(DEPS)
+	gcc $(COPT) -c $<
+
 utils.o:		utils.c $(DEPS)
 	gcc $(COPT) -c $<
diff --git a/funcs/hsv.c b/funcs/hsv.c
new file mode 100644
index 00000000..ba70b0b8
--- /dev/null
+++ b/funcs/hsv.c
@@ -0,0 +1,95 @@
+/*
+ *		FloatImg library
+ *		HUE - SATURATION - VALUE
+ */
+
+#include  <stdio.h>
+#include  <stdlib.h>
+#include  <string.h>
+#include  <math.h>
+#include  "../floatimg.h"
+
+extern int		verbosity;
+
+/* --------------------------------------------------------------------- */
+/*	helper functions						 */
+static float maxi3f(float a, float b, float c)
+{
+return ((a > b)? (a > c ? a : c) : (b > c ? b : c));
+}
+static float mini3f(float a, float b, float c)
+{
+return ((a < b)? (a < c ? a : c) : (b < c ? b : c));
+}
+static int pseudoeq(float a, float b)
+{
+return (fabsf(a-b)<0.00000000000001);		// UGLY HACK ???
+}
+/* --------------------------------------------------------------------- */
+/*
+ *		WARNING : ALL THIS CODE IS SHIT
+ */
+int fimg_rgb2hsv(float rgb[3], float hsv[3], float scale)
+{
+// float		h, s, v;
+float		cmin, cmax, diff;
+
+// scale input value to [0..1]
+rgb[0] /= scale; rgb[1] /= scale; rgb[2] /= scale;
+
+hsv[0] =  hsv[1] =  hsv[2] = -12345.6789;
+
+cmin = mini3f(rgb[0], rgb[1], rgb[2]);
+cmax = maxi3f(rgb[0], rgb[1], rgb[2]);
+diff = cmax - cmin;
+
+if (pseudoeq(cmax, cmin))		hsv[0] = 0.0;
+else if (pseudoeq(cmax, rgb[0]))
+	hsv[0] = fmod((60 * ((rgb[1] - rgb[2]) / diff) + 360), 360.0);
+else if (pseudoeq(cmax, rgb[1]))
+	hsv[0] = fmod((60 * ((rgb[2] - rgb[0]) / diff) + 120), 360.0);
+else if (pseudoeq(cmax, rgb[2]))
+	hsv[0] = fmod((60 * ((rgb[0] - rgb[1]) / diff) + 240), 360.0);
+
+if (pseudoeq(cmax, 0.0))	hsv[1] = 0.0;
+else				hsv[1] = (diff / cmax) / 100.0;
+
+hsv[2] = cmax * 100.0;		/* WHAT THE FUCK ? */
+
+#if DEBUG_LEVEL
+fprintf(stderr, "cmin/cmax   %f   %f\n", cmin, cmax);
+#endif
+
+return 0;
+}
+/* --------------------------------------------------------------------- */
+int fimg_essai_hsv(char *fname)
+{
+float		colors[3], values[3];
+int		foo, r, g, b;
+
+#define INC  16
+for (r=0; r<255; r+=INC) {
+ for (g=0; g<255; g+=INC) {
+  for (b=0; b<255; b+=INC) {
+
+	printf("%4d %4d %4d   ", r, g, b);
+
+	colors[0] = (float)r;
+	colors[1] = (float)g;
+	colors[2] = (float)b;
+	foo = fimg_rgb2hsv(colors, values, 255.0);
+	if (foo) {
+		exit(1);
+		}
+
+	printf("      %9.5f   %9.5f   %9.5f\n",
+			values[0], values[1], values[2]);
+
+	}
+ }
+}
+
+return -1;
+}
+/* --------------------------------------------------------------------- */
diff --git a/funcs/t.c b/funcs/t.c
index 0805507b..c8afb2b8 100644
--- a/funcs/t.c
+++ b/funcs/t.c
@@ -402,8 +402,10 @@ return 0;
 }
 /* --------------------------------------------------------------------- */
 
-		/* func in histogram.c */
-int fimg_essai_histo(FloatImg *src, char *outpic, int k);
+		
+int fimg_essai_histo(FloatImg *src, char *outpic, int k); /* histogram.c */
+int fimg_essai_hsv(char *fname);				/* hsv.c */
+
 
 int essai_histogramme(char *fname, int k)
 {
@@ -432,7 +434,7 @@ return 0;
 }
 /* --------------------------------------------------------------------- */
 enum nCmd { Equalize=1, Rotate, Sfx0, F3x3, MIRE, Wfits, Wpng, Wtiff,
-			Histo  };
+			Histo, Hsv  };
 typedef struct {
 	char	*name;
 	int	Cmd;
@@ -448,6 +450,7 @@ Command commands[] = {
 	{ "wpng",	Wpng		},
 	{ "wtiff",	Wtiff		},
 	{ "histo",	Histo		},
+	{ "hsv",	Hsv		},
 	{ NULL,		0		}
 	} ;
 
@@ -541,6 +544,9 @@ switch(opt) {
 	case Histo:
 		foo = essai_histogramme(filename, 98765);
 		break;
+	case Hsv:
+		foo = fimg_essai_hsv(filename);
+		break;
 	default:
 		fprintf(stderr, "%s : bad command\n", command);
 		exit(1);