diff --git a/floatimg.h b/floatimg.h
index a773979..58df6dd 100644
--- a/floatimg.h
+++ b/floatimg.h
@@ -5,7 +5,7 @@
  *	https://git.tetalab.org/tTh/FloatImg
  */
 
-#define		FIMG_VERSION	(186)
+#define		FIMG_VERSION	(187)
 #define		RELEASE_NAME	("noname")
 /*
  *	in memory descriptor
@@ -189,6 +189,9 @@ int fimg_mix_rgb_gray(FloatImg *img, float mix);
 int     fimg_shift_to_zero(FloatImg *s, FloatImg *d, float coefs[6]);
 int     fimg_auto_shift_to_zero(FloatImg *s, FloatImg *d);
 
+/*	funcs/falsecolors.c		*/
+int fimg_falsecolors_0(FloatImg *src, FloatImg *dst, int k, float valf);
+
 /*	--> funcs/plasmas.c		*/
 int fimg_prototype_plasma(FloatImg *img, double time, int type);
 
diff --git a/funcs/Makefile b/funcs/Makefile
index 584edc8..1ce197a 100644
--- a/funcs/Makefile
+++ b/funcs/Makefile
@@ -9,6 +9,7 @@ DEPS = ../floatimg.h Makefile
 OBJS = fimg-png.o fimg-tiff.o misc-plots.o filtrage.o utils.o	\
 	fimg-libpnm.o rampes.o rectangle.o			\
 	sfx0.o sfx1.o sfx2.o sfx3.o sfx4.o			\
+	falsecolors.o						\
 	geometry.o rotate.o fimg-openexr.o			\
 	equalize.o fimg-fits.o saturation.o histogram.o		\
 	fimg-dicom.o						\
@@ -137,6 +138,9 @@ qsortrgb.o:		qsortrgb.c $(DEPS)
 exporter.o:		exporter.c $(DEPS)
 	gcc $(COPT) -c $<
 
+falsecolors.o:		falsecolors.c $(DEPS)
+	gcc $(COPT) -c $<
+
 
 hsv.o:		hsv.c $(DEPS)
 	gcc $(COPT) -c $<
diff --git a/funcs/falsecolors.c b/funcs/falsecolors.c
new file mode 100644
index 0000000..663dd98
--- /dev/null
+++ b/funcs/falsecolors.c
@@ -0,0 +1,39 @@
+/*
+ *	FloatImg library from tTh - really ugly code inside
+ */
+
+#include  <stdio.h>
+#include  <stdint.h>
+#include  <sys/time.h>
+
+#include  "../floatimg.h"
+
+/* -------------------------------------------------------------- */
+/*	this is a global vars exported from main */
+extern	int	verbosity;
+
+/* -------------------------------------------------------------- */
+
+
+/* -------------------------------------------------------------- */
+/* nouveau 18 mai 2022 */
+int fimg_falsecolors_0(FloatImg *src, FloatImg *dst, int k, float valf)
+{
+int		x, y;
+
+fprintf(stderr, ">>> %s ( %p %p %d %f )\n", __func__,
+					src, dst, k, valf);
+
+for (y=0; y<src->height, y++) {
+	for (x=0; x<src->width, x++) {
+
+		/***********************/
+		/* DO SOMETHING HERE ! */
+		/***********************/
+
+		}
+	}
+
+return -1;
+}
+/* -------------------------------------------------------------- */
diff --git a/funcs/t.c b/funcs/t.c
index 70d0c26..96bb809 100644
--- a/funcs/t.c
+++ b/funcs/t.c
@@ -25,7 +25,7 @@ enum nCmd { Equalize=1, Rotate, Sfx0, F3x3, MIRE, Wfits, Wpng, Wtiff,
 			Displace, ReadPNG, Plasmas, Hilight, OpenEXR,
 			Geometrie, FileType, Mirror, KillRGB,
 			Pixelize,SplitLevel, DecompRgbz, DecompRgbg,
-			Rectangle, Dicom  };
+			Rectangle, Dicom, Fakolor0, Fakolor3  };
 typedef struct {
 	char	*name;
 	int	Cmd;
@@ -60,6 +60,8 @@ Command commands[] = {
 	{ "decomprgbg",	DecompRgbg	},
 	{ "rectangle",  Rectangle	},
 	{ "dicom",      Dicom		},
+	{ "fakolor0",	Fakolor0	},
+	{ "fakolor3",	Fakolor3	},
 	{ NULL,		0		}
 	} ;
 
@@ -248,7 +250,9 @@ switch(opt) {
 	case Dicom:
 		foo = essai_dicom(filename, outfile, 0);
 		break;
-
+	case Fakolor0:
+		foo = essai_0_fausses_couleurs(outfile, 0);
+		break;
 	default:
 		fprintf(stderr, "'%s' is a bad command\n", command);
 		exit(1);
@@ -256,7 +260,7 @@ switch(opt) {
 	}
 
 if (foo) {
-	fprintf(stderr, "******* Essai --> %d\n", foo);
+	fprintf(stderr, "******* essai --> %d\n\n", foo);
 	}
 
 fprintf(stderr, "++++++++++++ end of '%s' pid %d\n", command, getpid());
diff --git a/funcs/tests.c b/funcs/tests.c
index df773f3..3d48468 100644
--- a/funcs/tests.c
+++ b/funcs/tests.c
@@ -18,6 +18,26 @@
 extern int		verbosity;
 
 /* --------------------------------------------------------------------- */
+/* nouveau 18 mai 2022 */
+int essai_0_fausses_couleurs(char *dstfile, int type)
+{
+FloatImg	src, dst;
+int		foo;
+
+#define W 1024
+#define H 768
+fprintf(stderr, "\nEssais fausses couleurs (type %d) -> '%s'\n", type, dstfile);
+
+foo = fimg_create(&src, W, H, FIMG_TYPE_RGB);
+foo = fimg_hdeg_a(&src, 12e3);
+foo = fimg_clone(&src, &dst, 0);
+foo = fimg_clear(&dst);
+
+foo = fimg_falsecolors_0(&src, &dst, type, 3.141592654);
+
+foo= fimg_export_picture(&dst, dstfile, 0);
+return -1;
+}
 /* --------------------------------------------------------------------- */
 int essai_dicom(char *inf, char *outf, int k)
 {
@@ -41,6 +61,10 @@ FloatImg	img;
 int		foo;
 int		rect[4];
 
+if (0 != k) {
+	fprintf(stderr, "in %s, k muste be 0, was %d\n", __func__, k);
+	}
+
 foo = fimg_create(&img, 320, 240, FIMG_TYPE_RGB);
 
 fimg_drand48(&img, 1.0);
@@ -741,6 +765,10 @@ int essai_geometrie(char *infile, int notused)
 FloatImg	fimg, result;
 int		foo;
 
+if (0 != notused) {
+	fprintf(stderr, "in %s, k must be 0, was %d\n", __func__, notused);
+	}
+
 if (NULL != infile) {
 	fprintf(stderr, "loading %s\n", infile);
 	foo = fimg_create_from_dump(infile, &fimg);
@@ -879,13 +907,17 @@ int essai_mire(char *outname, int notused)
 FloatImg	fimg;
 int		re, foo;
 
+if (0 != notused) {
+	fprintf(stderr, "in %s, k must be 0, was %d\n", __func__, notused);
+	}
+
 fimg_create(&fimg, 1280, 960, FIMG_TYPE_RGB);
 
 re = fimg_test_pattern(&fimg, 9, 1.0);
 if (re) {
 	fprintf(stderr, "fimg_test_pattern -> %d\n", re);
 	}
-foo = fimg_export_picture(&fimg, "mire.pnm", 0);
+foo = fimg_export_picture(&fimg, outname, 0);
 fprintf(stderr, "in %s, export give a %d value\n", __func__, foo);
 
 return 0;
diff --git a/funcs/tests.h b/funcs/tests.h
index 1033a1c..bca8098 100644
--- a/funcs/tests.h
+++ b/funcs/tests.h
@@ -28,6 +28,7 @@ int essai_geometrie(char *infile, int notused);
 int essai_detect_type(void);
 int fimg_essai_histo(FloatImg *src, char *outpic, int k); /* histogram.c */
 int essai_histogramme(char *fname, int k);
+int essai_0_fausses_couleurs(char *dstfile, int type);
 
 int essai_lecture_png(char *fname, char *outfile, int notused);