diff --git a/floatimg.h b/floatimg.h
index f5a0b33..65c652a 100644
--- a/floatimg.h
+++ b/floatimg.h
@@ -2,7 +2,7 @@
  *	floatimg.h
  */
 
-#define		FIMG_VERSION	61
+#define		FIMG_VERSION	62
 
 /*
  *	in memory descriptor
@@ -23,9 +23,9 @@ typedef struct {
  *	fimg file header
  */
 typedef struct {
-	// char		magic[8];
+	char		magic[8];
 	int		w, h, t;
-	} FimgFhead;
+	} FimgFileHead;
 
 /*
  *	core module
diff --git a/lib/fimg-file.c b/lib/fimg-file.c
index a35da10..00e4040 100644
--- a/lib/fimg-file.c
+++ b/lib/fimg-file.c
@@ -7,7 +7,7 @@
 #include  <stdio.h>
 #include  <stdlib.h>
 #include  <unistd.h>
-#include  "string.h"
+#include  <string.h>
 
 #include  "../floatimg.h"
 
@@ -16,7 +16,8 @@ extern int verbosity;		/* must be declared around main() */
 /* ---------------------------------------------------------------- */
 int fimg_fileinfos(char *fname, int *datas)
 {
-FILE    *fp;
+FILE    	*fp;
+FimgFileHead	filehead;
 
 #if DEBUG_LEVEL
 fprintf(stderr, ">>> %-25s ( '%s' %p )\n", __func__, fname, datas);
@@ -27,29 +28,43 @@ if (NULL==fp) {
         perror(fname);
         return -1;
         }
-if (3 != fread(datas, sizeof(int), 3, fp)) {
-        fprintf(stderr, "%s: %s short read\n", __func__, fname);
+
+if (1 != fread(&filehead, sizeof(FimgFileHead), 1, fp)) {
+        fprintf(stderr, "%s: %s bad read\n", __func__, fname);
         fclose(fp);
         return -2;
         }
-
 fclose(fp);
 
+#if DEBUG_LEVEL
+fprintf(stderr, "    magic [%s]\n", filehead.magic);
+#endif
+ 
+if (strncmp(filehead.magic, "FIMG", 4)) {
+	fprintf(stderr, "'%s' is not a fimg file.\n", fname);
+	return -3;
+	}
+
+datas[0] = filehead.w;
+datas[1] = filehead.h;
+datas[2] = filehead.t;
+
 return 0;
 }
 /* ---------------------------------------------------------------- */
-int fimg_dump_to_file(FloatImg *head, char *fname, int notused)
+int fimg_dump_to_file(FloatImg *fimg, char *fname, int notused)
 {
-FILE	*fp;
-int	foo, nbre, dims[3];
+FILE		*fp;
+int		foo, nbre;
+FimgFileHead	filehead;
 
 #if DEBUG_LEVEL
-fprintf(stderr, ">>> %-25s ( %p '%s' %d )\n", __func__, head,
+fprintf(stderr, ">>> %-25s ( %p '%s' %d )\n", __func__, fimg,
 						fname, notused);
 #endif
 
-if (3 != head->type) {
-	fprintf(stderr, "%s : bat type %d\n", __func__, head->type);
+if (3 != fimg->type) {
+	fprintf(stderr, "%s : bat type %d\n", __func__, fimg->type);
 	return -8;
 	} 
 
@@ -59,22 +74,23 @@ if (NULL==fp) {
 	return -1;
 	}
 
-dims[0] = head->width;	dims[1] = head->height;
-dims[2] = head->type;
+strcpy(filehead.magic, "FIMG");
+filehead.w = fimg->width;	filehead.h = fimg->height;
+filehead.t = fimg->type;
 
-foo = fwrite(dims, sizeof(int), 3, fp);
-if (3 != foo) {
+foo = fwrite(&filehead, sizeof(FimgFileHead), 1, fp);
+if (1 != foo) {
 	perror(fname);
 	fclose(fp);
 	return -2;
 	}
-nbre = head->width*head->height*3;
+nbre = fimg->width*fimg->height*3;
 #if DEBUG_LEVEL
-fprintf(stderr, "  %s : data at %p\n", __func__, head->R);
+fprintf(stderr, "  %s : data at %p\n", __func__, fimg->R);
 #endif
 
-foo = fwrite(head->R, sizeof(float), nbre, fp);
-if (nbre!=foo) {
+foo = fwrite(fimg->R, sizeof(float), nbre, fp);
+if (nbre != foo) {
 	perror(fname);
 	fclose(fp);
 	return -3;
@@ -85,10 +101,12 @@ fclose(fp);
 return 0;
 }
 /* ---------------------------------------------------------------- */
+
 int fimg_create_from_dump(char *fname, FloatImg *head)
 {
-FILE	*fp;
-int	foo, dims[3];
+FILE		*fp;
+int		foo;
+FimgFileHead	filehead;
 
 #if DEBUG_LEVEL
 fprintf(stderr, ">>> %-25s ( '%s' %p )\n", __func__, fname, head);
@@ -100,24 +118,24 @@ if (NULL==fp) {
 	exit(1);
 	}
 	
-foo = fread(dims, sizeof(int), 3, fp);  
-if (3 != foo) {
+foo = fread(&filehead, sizeof(FimgFileHead), 1, fp);  
+if (1 != foo) {
 	fprintf(stderr, "%s : short read\n", fname);
 	fclose(fp);
 	return -1;
 	}
 #if DEBUG_LEVEL
 fprintf(stderr, "%s : got [ %d %d %d ] from '%s'\n", __func__,
-			dims[0], dims[1], dims[2], fname);
+			filehead.w, filehead.h, filehead.t, fname);
 #endif
 
-foo = fimg_create(head, dims[0], dims[1], dims[2]); 
+foo = fimg_create(head, filehead.w, filehead.h, filehead.t); 
 if (foo) {
 	fprintf(stderr, "%s : create -> %d\n", __func__, foo);
 	return foo;
 	}
 
-foo = fread(head->R, sizeof(float), dims[0]*dims[1]*3, fp);
+foo = fread(head->R, sizeof(float), filehead.w*filehead.h*3, fp);
 
 fclose(fp);
 	
diff --git a/lib/t.c b/lib/t.c
index d573950..ad8078e 100644
--- a/lib/t.c
+++ b/lib/t.c
@@ -12,16 +12,20 @@ int main(int argc, char *argv[])
 {
 int		foo;
 FloatImg 	fimg;
+int		datas[3];
 
 verbosity = 1;
 
-foo = fimg_load_from_pnm("/tmp/00000.ppm", &fimg, 0);
+foo = fimg_create(&fimg, 640, 480, 3);
 
-printf("retour du truc %d\n", foo);
+printf("retour du truc ---> %d\n", foo);
 
 fimg_printhead(&fimg);
 
-fimg_save_as_pnm(&fimg, "foo.pnm",  0);
+// fimg_save_as_pnm(&fimg, "foo.pnm",  0);
+foo = fimg_dump_to_file(&fimg, "foo.fimg", 0);
+
+foo = fimg_fileinfos("foo.fimg", datas);
 
 return 0;
-}
\ No newline at end of file
+}