diff --git a/floatimg.h b/floatimg.h
index 6d54a1f6..15fb0cd3 100644
--- a/floatimg.h
+++ b/floatimg.h
@@ -109,6 +109,10 @@ int fimg_colors_mixer_a(FloatImg *fimg, float fval);
 /*	#coronamaison			*/
 int fimg_rotate_90(FloatImg *src, FloatImg *dst, int notused);
 
+
+/* universal exporter XXX */
+int fimg_export_picture(FloatImg *pic, char *fname, int flags);
+
 /*	PNM files module		*/
 int fimg_save_as_pnm(FloatImg *head, char *fname, int flags);
 int fimg_load_from_pnm(char *fname, FloatImg *head, int notused);
diff --git a/funcs/Makefile b/funcs/Makefile
index 971c09e3..c7aa9576 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 classif.o contour2x2.o qsortrgb.o
+	hsv.o classif.o contour2x2.o qsortrgb.o exporter.o
 
 #---------------------------------------------------------------
 
@@ -67,6 +67,9 @@ classif.o:		classif.c $(DEPS)
 qsortrgb.o:		qsortrgb.c $(DEPS)
 	gcc $(COPT) -c $<
 
+exporter.o:		exporter.c $(DEPS)
+	gcc $(COPT) -c $<
+
 
 hsv.o:		hsv.c $(DEPS)
 	gcc $(COPT) -c $<
diff --git a/funcs/exporter.c b/funcs/exporter.c
new file mode 100644
index 00000000..ed6b698a
--- /dev/null
+++ b/funcs/exporter.c
@@ -0,0 +1,75 @@
+/*
+ *		exporter.c
+ */
+
+#include  <stdio.h>
+#include  <stdlib.h>
+#include  <string.h>
+
+#include "../floatimg.h"
+
+extern int		verbosity;
+
+/* --------------------------------------------------------------------- */
+/*
+ *	multi-magic 'save file' function.
+ */
+int fimg_export_picture(FloatImg *pic, char *fname, int flags)
+{
+int		filetype;
+int		foo;
+
+#if DEBUG_LEVEL
+fprintf(stderr, ">>> %s ( %p '%s' 0x%X )\n", __func__,
+				pic, fname, flags);
+#endif
+
+filetype = format_from_extension(fname);
+if (verbosity) {
+	fprintf(stderr, "file %s : type %d\n", fname, filetype);
+	}
+
+switch(filetype) {
+
+	case FILE_TYPE_FIMG:
+		foo = fimg_dump_to_file(pic, fname, 0);
+		break;
+
+	case FILE_TYPE_PNM:
+		foo = fimg_save_as_pnm(pic, fname, 0);
+		break;
+
+	case FILE_TYPE_PNG:
+		foo = fimg_save_as_png(pic, fname, 0);
+		break;
+
+	case FILE_TYPE_TGA:
+		fprintf(stderr, "%s: FILE_TYPE_TGA not implemented\n",
+				__func__);
+		foo = -666;
+		break;
+
+	case FILE_TYPE_TIFF:
+		foo = fimg_write_as_tiff(pic, fname, 0);
+		break;
+
+	case FILE_TYPE_FITS:
+		foo = fimg_save_R_as_fits(pic, fname, 0);
+		break;
+
+	default:
+		foo = -1789;
+		break;
+
+	}
+
+if (foo) {
+	fprintf(stderr, "%s: exporting '%s' -> %d\n", __func__,
+					fname, foo);
+	/* que faire maintenant ? */
+	}
+
+return foo;
+}
+/* --------------------------------------------------------------------- */
+
diff --git a/funcs/t.c b/funcs/t.c
index ecdf4b51..08d0a4e1 100644
--- a/funcs/t.c
+++ b/funcs/t.c
@@ -45,7 +45,7 @@ if (foo) {
 	return foo;
 	}
 
-foo = fimg_dump_to_file(&dst, "out.fimg", 0);
+foo = fimg_export_picture(&dst, "out.pnm", 0);
 if (foo) {
 	fprintf(stderr, "%s : err %d saving result\n", __func__, foo);
 	return foo;
@@ -58,6 +58,9 @@ return 0;
 /*
  *	nouveau 5 octobre 2020 pendant sonoptic
  */
+
+
+
 int essai_contour_2x2(char *infile)
 {
 FloatImg	src, dst;
@@ -78,13 +81,13 @@ else	{
 
 fimg_clone(&src, &dst, 1);
 
-foo = fimg_contour_2x2(&src, &dst, 1);
+foo = fimg_contour_2x2(&src, &dst, 0);
 if (foo) {
 	fprintf(stderr, "%s: err %d in contour_2x2\n", __func__, foo);
 	return foo;
 	}
 
-foo = fimg_save_as_pnm(&dst, "out.pnm", 0);
+foo = fimg_export_picture(&dst, "out2x2.pnm", 0);
 if (foo) {
 	fprintf(stderr, "%s : err %d saving result\n", __func__, foo);
 	return foo;
@@ -124,7 +127,7 @@ if (foo) {
 	return foo;
 	}
 
-foo = fimg_save_as_pnm(&dst, "out.pnm", 0);
+foo = fimg_export_picture(&dst, "out.pnm", 0);
 if (foo) {
 	fprintf(stderr, "%s : err %d saving result\n", __func__, foo);
 	return foo;
@@ -222,8 +225,8 @@ fimg_save_as_png(&src, "test.png", 0);
 foo = fimg_rotate_90(&src, &dst, 0);
 fprintf(stderr, "rotate 90 -> %d\n", foo);
 
-foo = fimg_save_as_png(&dst, "rotated90.png", 0);
-foo = fimg_save_as_pnm(&dst, "rotated90.pnm", 0);
+foo = fimg_export_picture(&dst, "rotated90.png", 0);
+foo = fimg_export_picture(&dst, "rotated90.pnm", 0);
 
 fimg_destroy(&src);
 
@@ -479,7 +482,7 @@ re = fimg_test_pattern(&fimg, 9, 1.0);
 if (re) {
 	fprintf(stderr, "fimg_test_pattern -> %d\n", re);
 	}
-fimg_save_as_pnm(&fimg, "mire.pnm", 0);
+fimg_export_picture(&fimg, "mire.pnm", 0);
 
 return -1;
 }
@@ -525,7 +528,6 @@ return 0;
 }
 /* --------------------------------------------------------------------- */
 
-		
 int fimg_essai_histo(FloatImg *src, char *outpic, int k); /* histogram.c */
 int fimg_essai_hsv(char *fname);				/* hsv.c */
 
@@ -598,7 +600,10 @@ void help(int k)
 {
 Command *pcmd;
 
-fprintf(stderr, "usage:\n\t./t command filename\n");
+fprintf(stderr, "usage:\n\t./t [options] command filename\n");
+
+fprintf(stderr, "options:\n");
+fprintf(stderr, "\t-o  outfile\n");
 
 fprintf(stderr, "commands:\n");
 pcmd = commands;
@@ -614,16 +619,19 @@ exit(0);
 int main(int argc, char *argv[])
 {
 int		foo, opt;
-char		*filename, *command;
+char		*filename, *command, *outfile;
 
 fprintf(stderr, "++++++++ test des fonctions pid=%d\n", getpid());
 
-global_fvalue = 1.0;
+global_fvalue	= 1.0;
+outfile 	= "out.pnm";
 
-while ((opt = getopt(argc, argv, "hk:v")) != -1) {
+
+while ((opt = getopt(argc, argv, "hk:p:v")) != -1) {
 	switch(opt) {
 		case 'h':	help(0);			break;
 		case 'k':	global_fvalue = atof(optarg);	break;
+		case 'o':	outfile = optarg;		break;
 		case 'v':	verbosity++;			break;
 		}
 	}