diff --git a/.gitignore b/.gitignore
index 548dcdd..9f1d4f2 100644
--- a/.gitignore
+++ b/.gitignore
@@ -29,6 +29,7 @@ funcs/*.o
 funcs/*.png
 funcs/*.gif
 funcs/*.fits
+funcs/*.tiff
 
 scripts/*.fimg
 scripts/*.pnm
diff --git a/floatimg.h b/floatimg.h
index 3e0a693..c59af44 100644
--- a/floatimg.h
+++ b/floatimg.h
@@ -148,6 +148,8 @@ int fimg_save_R_as_fits(FloatImg *src, char *outname, int flags);
 int fimg_save_G_as_fits(FloatImg *src, char *outname, int flags);
 int fimg_save_B_as_fits(FloatImg *src, char *outname, int flags);
 
+int fimg_write_as_tiff(FloatImg *src, char *fname, int flags);
+
 
 /*	mathematics operations 				*/
 float fimg_get_maxvalue(FloatImg *head);
diff --git a/funcs/Makefile b/funcs/Makefile
index 9ad28ab..edc0db8 100644
--- a/funcs/Makefile
+++ b/funcs/Makefile
@@ -9,7 +9,8 @@ OBJS = fimg-png.o fimg-tiff.o misc-plots.o filtrage.o utils.o	\
 #---------------------------------------------------------------
 
 t:	t.c $(DEPS) ../libfloatimg.a
-	gcc $(COPT) $< ../libfloatimg.a -lnetpbm -lpnglite -lcfitsio \
+	gcc $(COPT) $< ../libfloatimg.a -lnetpbm -lpnglite -lcfitsio	\
+			-ltiff						\
 			-lz -lm -o $@
 
 #---------------------------------------------------------------
diff --git a/funcs/fimg-tiff.c b/funcs/fimg-tiff.c
index f9b59f3..8e8c990 100644
--- a/funcs/fimg-tiff.c
+++ b/funcs/fimg-tiff.c
@@ -4,18 +4,87 @@
  */
 
 #include  <stdio.h>
+#include  <stdlib.h>
+
+#include  <tiffio.h>
 
 #include  "../floatimg.h"
 
 /* --------------------------------------------------------------------- */
+
+extern int		verbosity;
+
 /* --------------------------------------------------------------------- */
-int essai_ecrire_tiff(FloatImg *src, char *fname)
+int fimg_write_as_tiff(FloatImg *src, char *fname, int flags)
 {
+TIFF			*tiff;
+unsigned short		*linebuff, *ptr;
+int			x, y, idx, foo;
+char			ligne[100];
+double			maximum, fk;
 
 		/* bon, tout cela semble bien tortueux ! */
 
-	fprintf(stderr, "%s %s to be implemented\n", __FILE__, __func__);
+if (FIMG_TYPE_RGB != src->type) {
+	fprintf(stderr, "%s: src bad type %d\n", __func__, src->type);
+	return -2;
+	}
 
-return 0;
+linebuff = calloc(src->width, 3*sizeof(unsigned short));
+if (NULL==linebuff) {
+	fprintf(stderr, "%s: fatal memory error\n", __func__);
+	return -7;
+	}
+
+maximum = (double)fimg_get_maxvalue(src);
+fk = maximum / 65535.0;
+if (verbosity) {
+	fprintf(stderr, "%s : maxv %f fk %f\n", __func__, maximum, fk);
+	}
+
+tiff = TIFFOpen(fname, "w");
+
+printf("tiff at %p\n", tiff);
+
+TIFFSetField(tiff, TIFFTAG_IMAGEWIDTH,  src->width);
+TIFFSetField(tiff, TIFFTAG_IMAGELENGTH, src->height);
+
+TIFFSetField(tiff, TIFFTAG_SAMPLESPERPIXEL,  3);	// RGB
+TIFFSetField(tiff, TIFFTAG_BITSPERSAMPLE,   16);	// 0->65535
+
+TIFFSetField(tiff, TIFFTAG_PLANARCONFIG, PLANARCONFIG_CONTIG);
+TIFFSetField(tiff, TIFFTAG_PHOTOMETRIC, PHOTOMETRIC_RGB);
+
+sprintf(ligne, "lib FloatImg %d by tTh", FIMG_VERSION);
+TIFFSetField(tiff, TIFFTAG_SOFTWARE, ligne);
+
+foo = src->width * 3;
+foo = TIFFDefaultStripSize(tiff, foo);
+fprintf(stderr, "default strip size %d\n", foo);
+
+TIFFSetField(tiff, TIFFTAG_ROWSPERSTRIP, foo);
+
+for (y=0; y<src->height; y++) {
+
+	ptr = linebuff;
+	idx = y * src->width;
+
+	for (x=0; x<src->width; x++) {
+		*ptr++ = (unsigned short) (src->R[idx] / fk);
+		*ptr++ = (unsigned short) (src->G[idx] / fk);
+		*ptr++ = (unsigned short) (src->B[idx] / fk);
+		idx++;
+		}
+
+	TIFFWriteScanline(tiff, linebuff, y, 0);
+
+	idx += src->width;
+
+	}
+
+
+TIFFClose(tiff);
+
+return -1;
 }
 /* --------------------------------------------------------------------- */
diff --git a/funcs/t.c b/funcs/t.c
index 20cd8c6..ae5496d 100644
--- a/funcs/t.c
+++ b/funcs/t.c
@@ -14,6 +14,26 @@ int		verbosity;
 
 float		global_fvalue;
 
+/* --------------------------------------------------------------------- */
+/* nouveau 19 aout 2020, le matin avant la canicule */
+
+int essai_ecriture_tiff(char *outname)
+{
+int		foo;
+FloatImg	picz;
+
+fimg_create(&picz, 800, 600, FIMG_TYPE_RGB);
+fimg_test_pattern(&picz, 0, 22222);
+
+foo = fimg_write_as_tiff(&picz, outname, 0);
+if (foo) {
+	fprintf(stderr, "%s got a %d\n", __func__, foo);
+	return foo;
+	}
+
+
+return -7;
+}
 /* --------------------------------------------------------------------- */
 /*	essai de fichiers FITS (astronomie)				*/
 int essai_ecriture_fits(char *outname)
@@ -25,7 +45,6 @@ fprintf(stderr, "%s is creating the picz\n", __func__);
 fimg_create(&src, 512, 512, FIMG_TYPE_RGB);
 fimg_test_pattern(&src, 0, 255.0);
 
-foo = fimg_save_as_pnm(&src, "foo.pnm", 0);
 foo = fimg_save_R_as_fits(&src, outname, 0);
 
 fprintf(stderr, "saving '%s' to fits --> %d\n", outname, foo);
@@ -362,7 +381,7 @@ fprintf(stderr, "%s: save as pnm -> %d\n", __func__, foo);
 return 0;
 }
 /* --------------------------------------------------------------------- */
-int essai_ecrire_png(char *fname)
+int essai_ecriture_png(char *fname)
 {
 FloatImg	fimg;
 int		foo;
@@ -371,9 +390,10 @@ fimg_create(&fimg, 800, 600, FIMG_TYPE_RGB);
 
 fimg_draw_something(&fimg);
 
-
-foo = fimg_save_as_pnm(&fimg, "quux.pnm", 0);
-fprintf(stderr, "save as pnm -> %d\n", foo);
+if (verbosity) {
+	foo = fimg_save_as_pnm(&fimg, "quux.pnm", 0);
+	fprintf(stderr, "%s: save as pnm -> %d\n", __func__, foo);
+	}
 
 foo = fimg_save_as_png(&fimg, fname, 0);
 fprintf(stderr, "save as png -> %d\n", foo);
@@ -381,7 +401,7 @@ fprintf(stderr, "save as png -> %d\n", foo);
 return 0;
 }
 /* --------------------------------------------------------------------- */
-enum nCmd { Equalize=1, Rotate, Sfx0, F3x3, MIRE, Wfits, Wpng };
+enum nCmd { Equalize=1, Rotate, Sfx0, F3x3, MIRE, Wfits, Wpng, Wtiff };
 typedef struct {
 	char	*name;
 	int	Cmd;
@@ -395,6 +415,7 @@ Command commands[] = {
 	{ "mire",	MIRE		},
 	{ "wfits",	Wfits		},
 	{ "wpng",	Wpng		},
+	{ "wtiff",	Wtiff		},
 	{ NULL,		0		}
 	} ;
 
@@ -480,7 +501,10 @@ switch(opt) {
 		foo =  essai_ecriture_fits(filename);
 		break;
 	case Wpng:
-		foo = essai_ecrire_png(filename);
+		foo = essai_ecriture_png(filename);
+		break;
+	case Wtiff:
+		foo = essai_ecriture_tiff(filename);
 		break;
 	default:
 		fprintf(stderr, "%s : bad command\n", command);