diff --git a/.gitignore b/.gitignore
index 60f208e..6383625 100644
--- a/.gitignore
+++ b/.gitignore
@@ -68,6 +68,7 @@ tools/addpnm2fimg
 tools/cumulfimgs
 tools/fimgops
 tools/fimgfx
+tools/fimgmetadata
 tools/*.png
 tools/*.tiff
 
diff --git a/floatimg.h b/floatimg.h
index 9967f1e..e822720 100644
--- a/floatimg.h
+++ b/floatimg.h
@@ -4,7 +4,7 @@
  *	http://la.buvette.org/photos/cumul
  */
 
-#define		FIMG_VERSION	177
+#define		FIMG_VERSION	179
 
 /*
  *	in memory descriptor
@@ -34,10 +34,13 @@ typedef struct {
 typedef struct {
 	char		magic[8];
 	struct timeval	timestamp;
+	uint64_t	pid;			// WTF ?
 	int32_t		count;
 	float		fval;
 	char		idcam[32];
 	int32_t		origin;			// enum ?
+	uint32_t	reserved[8];
+
 	} FimgMetaData;
 /*
  *	we MUST look at packing and endianess problems NOW */
@@ -221,11 +224,15 @@ int fimg_vdeg_a(FloatImg *img, double dcoef);
 /*	FIMG native file module		*/
 int   fimg_fileinfos(char *fname, int *datas);
 int   fimg_dump_to_file(FloatImg *head, char *fname, int notused);
+int fimg_dumpmd_to_file(FloatImg *fi, char *nm, FimgMetaData *pmd, int nu);
+
 int   fimg_load_from_dump(char *fname, FloatImg *where);
 int   fimg_create_from_dump(char *fname, FloatImg *head);
+
 /*	FIMG metadata module		*/
 int fimg_show_metadata(FimgMetaData *pmd, char *title, int notused);
 int fimg_default_metadata(FimgMetaData *pmd);
+int fimg_get_metadata_from_file(char *fname, FimgMetaData *pmd);
 
 int fimg_save_R_as_fits(FloatImg *src, char *outname, int flags);
 int fimg_save_G_as_fits(FloatImg *src, char *outname, int flags);
diff --git a/lib/README.md b/lib/README.md
index e69de29..ee05c62 100644
--- a/lib/README.md
+++ b/lib/README.md
@@ -0,0 +1,4 @@
+# Fimg tools
+
+Need more explanations...
+
diff --git a/lib/fimg-core.c b/lib/fimg-core.c
index f865d04..c8fcea4 100644
--- a/lib/fimg-core.c
+++ b/lib/fimg-core.c
@@ -55,6 +55,7 @@ void fimg_print_sizeof(void)
 {
 fprintf(stderr, "   sz FloatImg =   %lu\n", sizeof(FloatImg));
 fprintf(stderr, "   sz filehead =   %lu\n", sizeof(FimgFileHead));
+fprintf(stderr, "   sz metadata =   %lu\n", sizeof(FimgMetaData));
 fprintf(stderr, "   sz filter   =   %lu\n", sizeof(FimgFilter3x3));
 }
 /* --------------------------------------------------------------------- */
diff --git a/lib/fimg-file.c b/lib/fimg-file.c
index b6ab586..caad379 100644
--- a/lib/fimg-file.c
+++ b/lib/fimg-file.c
@@ -59,7 +59,82 @@ return 0;
 }
 /* ---------------------------------------------------------------- */
 /*
- *	/!\		thi func work ONLY on RGB image
+ *  new avril 2022 : trying to save metadatas...
+ */
+int fimg_dumpmd_to_file(FloatImg *fimg, char *fname,		\
+				FimgMetaData *pmd, int notused)
+{
+FILE		*fp;
+int		foo, nbre;
+FimgFileHead	filehead;
+
+#if 1 // DEBUG_LEVEL
+fprintf(stderr, ">>> %s ( %p '%s' %p %d )\n", __func__, fimg,
+						fname, pmd, notused);
+#endif
+
+if (FIMG_TYPE_RGB != fimg->type) {
+	fprintf(stderr, "%s : bad type %d\n", __func__, fimg->type);
+	return -8;
+	}
+
+fp = fopen(fname, "w");
+if (NULL==fp) {
+	perror(fname);
+	return -1;
+	}
+
+memset(&filehead, 0, sizeof(filehead));
+memcpy(filehead.magic, "FIMG", 4);
+filehead.w = fimg->width;	filehead.h = fimg->height;
+filehead.t = fimg->type;
+
+/* XXX     metadata */
+if (NULL != pmd) {
+
+	filehead.magic[4] = 'a';
+	}
+
+foo = fwrite(&filehead, sizeof(FimgFileHead), 1, fp);
+if (1 != foo) {
+	perror(fname);
+	fclose(fp);
+	/* may be here, we can remove the broken file ? */
+	return -2;
+	}
+
+/* XXX     metadata */
+if (NULL != pmd) {
+	foo = fwrite(pmd, sizeof(FimgMetaData), 1, fp);
+	if (1 != foo) {
+		perror(fname);
+		fclose(fp);
+		/* may be here, we can remove the broken file ? */
+		return -2;
+		}
+	}
+
+nbre = fimg->width * fimg->height;	/* pixels per frame */
+foo = fwrite(fimg->R, sizeof(float), nbre, fp);
+if (nbre != foo) {
+	perror(fname); fclose(fp); return -3;
+	}
+foo = fwrite(fimg->G, sizeof(float), nbre, fp);
+if (nbre != foo) {
+	perror(fname); fclose(fp); return -3;
+	}
+foo = fwrite(fimg->B, sizeof(float), nbre, fp);
+if (nbre != foo) {
+	perror(fname); fclose(fp); return -3;
+	}
+
+fclose(fp);
+
+return 0;
+}
+/* ---------------------------------------------------------------- */
+/*
+ *	/!\		this func work ONLY on RGB image
  */
 int fimg_dump_to_file(FloatImg *fimg, char *fname, int notused)
 {
@@ -72,7 +147,7 @@ fprintf(stderr, ">>> %-25s ( %p '%s' %d )\n", __func__, fimg,
 						fname, notused);
 #endif
 
-if (3 != fimg->type) {
+if (FIMG_TYPE_RGB != fimg->type) {
 	fprintf(stderr, "%s : bad type %d\n", __func__, fimg->type);
 	return -8;
 	} 
diff --git a/lib/metadata.c b/lib/metadata.c
index af0f876..03b47ad 100644
--- a/lib/metadata.c
+++ b/lib/metadata.c
@@ -12,34 +12,62 @@
 
 extern int verbosity;           /* must be declared around main() */
 
+/* ---------------------------------------------------------------- */
+static void puts_magic_8(char *ptr, FILE *fp)
+{
+int		foo;
+
+fputs("magic                = ", fp);
+fputc('[', fp);
+for (foo=0; foo<8; foo++) {
+	fputc(ptr[foo], fp);
+	}
+fputc(']', fp); fputc('\n', fp);
+fflush(fp);
+}
 /* ---------------------------------------------------------------- */
 int fimg_show_metadata(FimgMetaData *pmd, char *title, int notused)
 {
+int		foo;
 
 fprintf(stderr, ">>> %s ( %p '%s' 0x%08x )\n", __func__,
 				pmd, title, notused);
 
-fprintf(stderr, "sizeof metadata     = %ld\n", sizeof(FimgMetaData));
-fprintf(stderr, "magic               = '%8s'\n", pmd->magic);
-/* TIMESTAMP HERE */
-fprintf(stderr, "counter             = %d\n", pmd->count);
-fprintf(stderr, "float value         = %.3f\n", pmd->fval);
-fprintf(stderr, "id camera           = '%s'\n", pmd->idcam);
-fprintf(stderr, "origin              = %d\n", pmd->origin);
+if (verbosity) {
+	fprintf(stderr, "sizeof(metadata)     = %ld\n",    \
+				sizeof(FimgMetaData));
+	puts_magic_8(pmd->magic, stderr);
+	}
 
-return -1;
+/* SHOW TIMESTAMP HERE */
+fprintf(stderr, "creator pid          = %ld\n", pmd->pid);
+fprintf(stderr, "counter              = %d\n", pmd->count);
+fprintf(stderr, "float value          = %.3f\n", pmd->fval);
+fprintf(stderr, "id camera            = '%s'\n", pmd->idcam);
+fprintf(stderr, "origin               = 0x%x\n", pmd->origin);
+
+fputs("reserved words are:\n      ", stderr);
+for (foo=0; foo<8; foo++) {
+	fprintf(stderr, "   0x%08x", pmd->reserved[foo]);
+	if (3 == foo) fputs("\n      ", stderr);
+	}
+fputc('\n', stderr);
+return 0;
 }
 /* ---------------------------------------------------------------- */
 int fimg_default_metadata(FimgMetaData *pmd)
 {
 
+memset(pmd, 0, sizeof(FimgMetaData));
 memcpy(pmd->magic, "metadata", 8);
+/* set timestamp here ? */
+pmd->pid = getpid();
 pmd->count    = 0;
 pmd->fval     = 255.0;
 strcpy(pmd->idcam, "<unknow>");
-pmd->origin   = 999;
+pmd->origin   = 0x55555555;
 
-return -1;
+return 0;
 }
 /* ---------------------------------------------------------------- */
 int fimg_get_metadata_from_file(char *fname, FimgMetaData *pmd)
@@ -49,17 +77,18 @@ FimgFileHead		filehead;
 FimgMetaData		metadata;
 int			foo;
 
-#if DEBUG_LEVEL
-fprintf(stderr, ">>> %s ( %s %p )\n", __func__, fname, pmd);
-#endif
+// #if DEBUG_LEVEL
+fprintf(stderr, ">>> %s ( '%s' %p )\n", __func__, fname, pmd);
+// #endif
 
 if (NULL==(fp=fopen(fname, "r"))) {
+	perror(fname);
 	return -1;
 	}
 
 foo = fread(&filehead, sizeof(FimgFileHead), 1, fp);
-if (sizeof(FimgFileHead) != foo) {
-	fprintf(stderr, "short read on %s (head)\n", fname);
+if (1 != foo) {
+	fprintf(stderr, "short read (%d) on %s (head)\n", foo, fname);
 	fclose(fp);
 	return -2;
 	}
@@ -71,13 +100,13 @@ if (memcmp(filehead.magic, "FIMG", 4)) {
 	}
 
 if ('a' != filehead.magic[4]) {
-	fprintf(stderr, "'%s' have no metadata.\n", fname);
+	fprintf(stderr, "file '%s' have no metadata.\n", fname);
 	fclose(fp);
 	return -4;
 	}
 
 foo = fread(&metadata, sizeof(FimgMetaData), 1, fp);
-if (sizeof(FimgMetaData) != foo) {
+if (1 != foo) {
 	fprintf(stderr, "short read on %s (metadata)\n", fname);
 	fclose(fp);
 	return -5;
@@ -87,7 +116,6 @@ fclose(fp);		/* got all needed datas */
 
 if (memcmp(metadata.magic, "metadata", 8)) {
 	fprintf(stderr, "'%s' invalid metadata.\n", fname);
-	fclose(fp);
 	return -6;
 	}
 
diff --git a/lib/t.c b/lib/t.c
index 70db717..ed321e2 100644
--- a/lib/t.c
+++ b/lib/t.c
@@ -24,7 +24,12 @@ fprintf(stderr, "-------- %s ( %s ) --------\n", __func__, fname);
 
 foo = fimg_default_metadata(&Md);
 
-foo = fimg_show_metadata(&Md, "from t.c", 0);
+// foo = fimg_show_metadata(&Md, "default from t.c", 0);
+
+foo = fimg_get_metadata_from_file(fname, &Md);
+fprintf(stderr, "%s : get metadata -> %d\n", fname, foo);
+
+foo = fimg_show_metadata(&Md, fname, 0);
 
 return -1;
 }
@@ -85,7 +90,7 @@ int essai_interpolate(int k)
 FloatImg	A, B, C;
 int		foo, idx;
 char		ligne[200];
-float		fval, minmax[6];
+float		fval;
 
 foo = fimg_create(&A, WI, HI, FIMG_TYPE_RGB);
 if (foo) {
@@ -314,7 +319,7 @@ if (verbosity)	{
 	fimg_print_sizeof();
 	}
 
-foo = essai_metadata("foo.fimg");
+foo = essai_metadata("quux.fimg");
 fprintf(stderr, "retour essai  -> %d\n", foo);
 
 // foo = essai_save_plane(0);
diff --git a/tools/Makefile b/tools/Makefile
index b16889f..126b875 100644
--- a/tools/Makefile
+++ b/tools/Makefile
@@ -13,8 +13,12 @@ DEPS = ../floatimg.h  ../libfloatimg.a Makefile
 all:	fimg2pnm mkfimg png2fimg fimgstats fimg2png		\
 	fimg2tiff fimg2text fimg2fits				\
 	addpnm2fimg cumulfimgs fimgops fimgfx			\
+	fimgmetadata						\
 	fimghalfsize
 
+fimgmetadata:	fimgmetadata.c $(DEPS)
+	gcc $(COPT) $< ../libfloatimg.a -lm -o $@
+
 fimgstats:	fimgstats.c $(DEPS)
 	gcc $(COPT) $< ../libfloatimg.a -lm -o $@
 
diff --git a/tools/README.md b/tools/README.md
index 8743b18..a32cca7 100644
--- a/tools/README.md
+++ b/tools/README.md
@@ -10,7 +10,17 @@ Génération d'une image flottante avec des choses dedans.
 Un [../scripts/demo-mkfimg.sh](script) permet de créer toutes
 les images disponibles.
 
+L'option `-m` rajoute des méta-données, cette option 
+**ne** doit **pas** encore être utilisée dans la vrai vie.
+
 ## fimgops
+```
+usage:
+        fimgops [options] A.fimg B.fimg operator D.fimg
+options:
+        -k N.N          set float value (def=0.500)
+        -v              increase verbosity
+```
 
 ## fimgfx
 
@@ -22,7 +32,7 @@ effects:
 
 Compute some useless numbers...
 
-## fimg2pnm - fimg2png - fimg2tiff
+## fimg2pnm - fimg2png - fimg2tiff - fimg2fips
 
 Exportation d'image flottante vers divers formats. Certains d'entre eux
 ne sont gérés que de façon très rudimentaire.
@@ -32,3 +42,6 @@ ne sont gérés que de façon très rudimentaire.
 Nouveau de l'année 2020+1 : exfiltrer toutes des données d'une image flottante
 afin de les rendre machinables.
 
+## fimgmetadata
+
+Nouveau avril 2022. Need more doc...
diff --git a/tools/fimgmetadata.c b/tools/fimgmetadata.c
new file mode 100644
index 0000000..859d7cc
--- /dev/null
+++ b/tools/fimgmetadata.c
@@ -0,0 +1,69 @@
+/*
+ *		FIMG METADATA TOOL
+ */
+
+#include  <stdio.h>
+#include  <string.h>
+#include  <stdint.h>
+#include  <stdlib.h>
+#include  <unistd.h>
+#include  <time.h>
+
+#include  "../floatimg.h"
+
+int		verbosity;
+
+/* --------------------------------------------------------------------- */
+int get_print_metadata(char *fname, char *command)
+{
+int		foo;
+FimgMetaData	metadata;
+
+// #if DEBUG_LEVEL
+fprintf(stderr, ">>> %s ( '%s' %s )\n", __func__, fname, command);
+// #endif
+
+foo = fimg_get_metadata_from_file(fname, &metadata);
+if (foo)	return foo;
+
+/* switch on command here, please */
+
+fimg_show_metadata(&metadata, fname, 0);
+
+return 0;
+}
+/* --------------------------------------------------------------------- */
+void help(void)
+{
+fprintf(stderr, "*** fimgmetadata (%s, %s)\n", __DATE__, __TIME__);
+fimg_print_version(1);
+exit(0);
+}
+/* --------------------------------------------------------------------- */
+
+int main(int argc, char *argv[])
+{
+int		foo, opt, nbargs;
+char		*fname;
+
+while ((opt = getopt(argc, argv, "hv")) != -1) {
+	switch(opt) {
+		case 'h':	help();				break;
+		case 'v':	verbosity++;			break;
+		}
+	}
+
+nbargs = argc - optind;
+// fprintf(stderr, "nbargs = %d\n", nbargs);
+if (2 != nbargs) {
+	fprintf(stderr, "%s need two args: command & filename\n", argv[0]);
+	exit(1);
+	}
+
+foo = get_print_metadata(argv[optind], argv[optind+1]);
+if (foo) fprintf(stderr, "got a %d from job\n", foo);
+
+return 0;
+}
+/* --------------------------------------------------------------------- */
+
diff --git a/tools/mkfimg.c b/tools/mkfimg.c
index 5bf855b..b3f11ab 100644
--- a/tools/mkfimg.c
+++ b/tools/mkfimg.c
@@ -68,7 +68,7 @@ for (type = types; type->code; type++) {
 exit(0);
 }
 /* --------------------------------------------------------------------- */
-static void help(int lj)
+static void help(void)
 {
 int		foo, cc;
 
@@ -76,11 +76,11 @@ puts("Usage:\tmkfimg [options]  quux.fimg width height");
 
 puts("\t-k N.N\tgive a float parameter");
 puts("\t-L\tlist howto make a pic");
-fputs("\t-t bla\thowto make the pic :\n\t\t| ", stdout);
+fputs("\t-t bla\thowto make the pic :\n\t\t  | ", stdout);
 
 for (foo=cc=0; types[foo].code; foo++) {
 	cc += printf("%s ", types[foo].name);
-	if (cc>42) { cc=0; printf("\n\t\t| "); }
+	if (cc>35) { cc=0; printf("\n\t\t  | "); }
 	}
 
 puts("\n\t-v\tincrease verbosity");
@@ -100,14 +100,17 @@ int		width, height;
 char		*fname;
 float		fvalue = 1.0;
 int		type = T_BLACK;
+int		wrmdata = 0;
 char		*tname = "wtf?";
 
 FloatImg	fimg;
+FimgMetaData	metadata;
 
-while ((opt = getopt(argc, argv, "hk:Lt:v")) != -1) {
+while ((opt = getopt(argc, argv, "hk:Lmt:v")) != -1) {
 	switch(opt) {
-		case 'h':	help(0);			break;
+		case 'h':	help();				break;
 		case 'k':	fvalue = atof(optarg);		break;
+		case 'm':	wrmdata = 1;			break;
 		case 't':	type = get_type_by_name(tname=optarg);
 				break;
 		case 'L':	list_types();			break;
@@ -147,8 +150,8 @@ switch (nbargs) {
 
 fname = argv[optind];
 
-if (verbosity>1) fprintf(stderr, "*** mkfimg *** %s %s\n",
-					__DATE__, __TIME__);
+if (verbosity>1) fprintf(stderr, "*** mkfimg *** %s %s *** pid %ld\n",
+				__DATE__, __TIME__, (long)getpid());
 if (verbosity)   fprintf(stderr, "making  '%s'  %dx%d, type %d\n",
 					fname, width, height, type);
 
@@ -174,7 +177,18 @@ switch(type) {
 	case -1:		exit(1);
 	}
 
-foo = fimg_dump_to_file(&fimg, fname, 0);
+if (wrmdata) {
+	fprintf(stderr, "%s: warning, metadata is bogus\n", argv[0]);
+	(void)fimg_default_metadata(&metadata);
+	sprintf(metadata.idcam, "mkfimg (libv %d)", FIMG_VERSION);
+	foo = fimg_dumpmd_to_file(&fimg, fname, &metadata, 0);
+#if DEBUG_LEVEL
+	fprintf(stderr, "save w. metadata -> %d\n", foo);
+#endif
+	}
+else	{
+	foo = fimg_dump_to_file(&fimg, fname, 0);
+	}
 if (foo) {
 	fprintf(stderr, "dump fimg to %s -> %d\n", fname, foo);
 	exit(1);