diff --git a/.gitignore b/.gitignore
index d73467d..78d1411 100644
--- a/.gitignore
+++ b/.gitignore
@@ -26,6 +26,7 @@ doc/*.ilg
 doc/*.ind
 
 funcs/t
+funcs/*.png
 
 scripts/*.fimg
 scripts/*.pnm
diff --git a/floatimg.h b/floatimg.h
index fc87e49..de7692b 100644
--- a/floatimg.h
+++ b/floatimg.h
@@ -2,7 +2,7 @@
  *	floatimg.h
  */
 
-#define		FIMG_VERSION	80
+#define		FIMG_VERSION	81
 
 /*
  *	in memory descriptor
diff --git a/funcs/Makefile b/funcs/Makefile
index ca69a5d..765f181 100644
--- a/funcs/Makefile
+++ b/funcs/Makefile
@@ -8,7 +8,7 @@ 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 -o $@
+	gcc $(COPT) $< ../libfloatimg.a -lnetpbm -lpnglite -lm -o $@
 
 #---------------------------------------------------------------
 
diff --git a/funcs/fimg-png.c b/funcs/fimg-png.c
index e1ec15f..6daa482 100644
--- a/funcs/fimg-png.c
+++ b/funcs/fimg-png.c
@@ -1,5 +1,6 @@
 /*
  *		Lecture des images PNG
+ *		L'ecriture est en chantier :}
  */
 
 #include <stdio.h>
@@ -175,13 +176,59 @@ png_close_file(&png);
 return 0;
 }
 /* --------------------------------------------------------------------- */
-
+/* nouveau 13 decembre 2019 */
 int fimg_save_as_png(FloatImg *src, char *outname, int flags)
 {
-png_t		png;
+png_t			png;
+int			foo, sz, idx;
+unsigned char		*bytes, *bptr;
+double			maximum, fk;
 
+#if DEBUG_LEVEL
+fprintf(stderr, ">>> %-25s ( %p '%s' %x )\n", __func__, src, outname, flags);
+#endif
 
+/* convert ou floating datas to a byte/rgb array */
+   /* first, alloc a buffer */
+sz = src->width * src->height;
+bytes = calloc(sz, 3);
+if (NULL==bytes) {
+	fprintf(stderr, "%s : no mem ?\n", __func__);
+	exit(3);
+	}
+   /* compute max value */
+maximum = (double)fimg_get_maxvalue(src);
+fk = maximum / 255.0;
+fprintf(stderr, "   max values %g fk %g\n", maximum, fk);
+   /* massage des pixels */
+bptr = bytes;
+for (idx=0; idx<sz; idx++) {
+	*bptr++ = (unsigned char) (src->R[idx] / fk);
+	*bptr++ = (unsigned char) (src->G[idx] / fk);
+	*bptr++ = (unsigned char) (src->B[idx] / fk);
+	}
 
-return -1;
+memset(&png, 0, sizeof(png_t));
+png_init(NULL, NULL);			/* this is VITAL ! */
+
+foo = png_open_file_write(&png, outname);
+if (PNG_NO_ERROR != foo) {
+	fprintf(stderr, "error in '%s' : open_file_write -> %d\n",
+						__func__, foo);
+	return foo;
+	}
+
+foo = png_set_data(&png, src->width, src->height, 8, PNG_TRUECOLOR, bytes);
+if (PNG_NO_ERROR != foo) {
+	fprintf(stderr, "error in '%s' : set_data -> %d\n",
+						__func__, foo);
+	return foo;
+	}
+
+png_close_file(&png);
+
+free(bytes);		/* yolo ? */
+
+return 0;
 }
 /* --------------------------------------------------------------------- */
diff --git a/funcs/t.c b/funcs/t.c
index 98f58b1..d4ab3f2 100644
--- a/funcs/t.c
+++ b/funcs/t.c
@@ -51,11 +51,30 @@ printf("%-10s %d\n\n", fname, foo);
 return 0;
 }
 /* --------------------------------------------------------------------- */
-int main(int argc, char *argv[])
+int essai_ecrire_png(char *fname)
 {
+FloatImg	fimg;
 int		foo;
 
-foo = essai_detect_type();
+fimg_create(&fimg, 512, 512, FIMG_TYPE_RGB);
+for (foo=0; foo<512; foo++) {
+	fimg_plot_rgb(&fimg, foo, foo, 17000.0, 8000.0, 11111.1);
+	}
+
+fimg_save_as_pnm(&fimg, "quux.pnm", 0);
+
+foo = fimg_save_as_png(&fimg, fname, 0);
+
+return 0;
+}
+/* --------------------------------------------------------------------- */
+int main(int argc, char *argv[])
+{
+int		foo;
+
+puts("++++++++++++++++++++++++++++++++");
+
+foo = essai_ecrire_png("dessin.png");
 
 return 0;
 }
diff --git a/install.sh b/install.sh
index 2a29004..ca6cd2b 100755
--- a/install.sh
+++ b/install.sh
@@ -4,6 +4,7 @@ cp	libfloatimg.a 	/usr/local/lib
 cp	floatimg.h 	/usr/local/include
 
 cp	tools/mkfimg tools/fimg2pnm tools/fimgops 	\
+	tools/fimg2png					\
 	tools/png2fimg tools/fimgstats tools/fimgfx	\
 	/usr/local/bin
 
diff --git a/tools/Makefile b/tools/Makefile
index d389817..088d54f 100644
--- a/tools/Makefile
+++ b/tools/Makefile
@@ -30,7 +30,7 @@ fimg2pnm:	fimg2pnm.c  $(DEPS)
 	gcc $(COPT) $< ../libfloatimg.a -o $@ 
 
 fimg2png:	fimg2png.c  $(DEPS)
-	gcc $(COPT) $< ../libfloatimg.a -o $@ 
+	gcc $(COPT) $< ../libfloatimg.a -lpnglite -o $@ 
 
 addtga2fimg:	addtga2fimg.c  $(DEPS)
 	gcc $(COPT) $< ../libfloatimg.a -limageSO -lm -o $@
diff --git a/tools/fimg2png.c b/tools/fimg2png.c
index 6546142..db6bba5 100644
--- a/tools/fimg2png.c
+++ b/tools/fimg2png.c
@@ -1,13 +1,56 @@
+/*
+ *	converting a floatimg to a PNG
+ */
+
 #include  <stdio.h>
 #include  <stdlib.h>
 #include  <unistd.h>
 
 #include  "../floatimg.h"
 
-/* --------------------------------------------------------------------- */
+int		verbosity;
+
+/* ----------------------------------------------------------------- */
+int convertir_fimg_en_PNG(char *srcname, char *dstname, int notused)
+{
+int		foo, infos[3];
+FloatImg	fimg;
+
+#if DEBUG_LEVEL
+fprintf(stderr, ">>> %25s ( '%s' '%s' %d )\n", __func__,
+			srcname, dstname, notused);
+#endif
+
+foo = fimg_fileinfos(srcname, infos);
+if (foo) { fprintf(stderr, "'%s' get dims -> %d\n", srcname, foo); }
+
+if (verbosity) {
+	fprintf(stderr, "image '%s' is %d x %d  %s\n",
+				srcname, infos[0], infos[1],
+				fimg_str_type(infos[2]));
+	}
+
+foo = fimg_create_from_dump(srcname, &fimg);
+if (foo) {
+	fprintf(stderr, "create fimg from '%s' -> %d\n", srcname, foo);
+	return -1;
+	}
+
+foo = fimg_save_as_png(&fimg, dstname, 0);
+if (foo) {
+	fprintf(stderr, "saving as png '%s' -> %d\n", dstname, foo);
+	return -1;
+	}
+
+fimg_destroy(&fimg);
+
+return -1;
+}
+/* ----------------------------------------------------------------- */
+
 int main(int argc, char *argv[])
 {
-// int		foo;
+int		foo;
 
 if (3 != argc) {
 	fimg_print_version(1);
@@ -15,9 +58,10 @@ if (3 != argc) {
 	exit(1);
 	}
 
-fprintf(stderr, "ah ah ah, no working code here !\n");
+foo = convertir_fimg_en_PNG(argv[1], argv[2], 0);
+fprintf(stderr, "%s : got a %d from convertor\n", argv[0], foo);
 
 return 0;
 }
-/* --------------------------------------------------------------------- */
+/* ----------------------------------------------------------------- */
 
diff --git a/v4l2/Makefile b/v4l2/Makefile
index 690aa7a..d81028f 100644
--- a/v4l2/Makefile
+++ b/v4l2/Makefile
@@ -1,6 +1,6 @@
 
 
-COPT = -Wall -fpic -g -no-pie -DDEBUG_LEVEL=1
+COPT = -Wall -fpic -g -no-pie -DDEBUG_LEVEL=0
 DEPS = ../floatimg.h  ../libfloatimg.a Makefile
 
 all:	grabvidseq t