diff --git a/floatimg.h b/floatimg.h
index 13a9fdb..afb0829 100644
--- a/floatimg.h
+++ b/floatimg.h
@@ -58,7 +58,7 @@ int fimg_sub(FloatImg *a, FloatImg *b, FloatImg *d);
 int fimg_mul(FloatImg *a, FloatImg *b, FloatImg *d);
 
 /*	PNM files module		*/
-int fimg_save_as_pnm(FloatImg *head, char *fname, int notused);
+int fimg_save_as_pnm(FloatImg *head, char *fname, int flags);
 int fimg_load_from_pnm(char *fname, FloatImg *head, int notused);
 
 double fimg_timer_set(int whot);
diff --git a/lib/fimg-pnm.c b/lib/fimg-pnm.c
index 80db3e6..5af3f63 100644
--- a/lib/fimg-pnm.c
+++ b/lib/fimg-pnm.c
@@ -131,17 +131,17 @@ fputs("\n", fp);
 }
 /* ---------------------------------------------------------------- */
 /*
- *
+ *		bit 0 of flags : use fvalue/count
  */
-int fimg_save_as_pnm(FloatImg *head, char *fname, int notused)
+int fimg_save_as_pnm(FloatImg *head, char *fname, int flags)
 {
 FILE		*fp;
 float		maximum, fk;
 char		*code;
 
 #if DEBUG_LEVEL
-fprintf(stderr, ">>> %-25s ( %p '%s' %d )\n", __func__, head,
-						fname, notused);
+fprintf(stderr, ">>> %-25s ( %p '%s' 0x%04x )\n", __func__, head,
+						fname, flags);
 #endif
 
 if ( head->type != FIMG_TYPE_RGB && head->type != FIMG_TYPE_GRAY) {
@@ -163,10 +163,18 @@ switch(head->type) {
 
 fprintf(fp, "%s\n%d %d\n", code, head->width, head->height);
 
-maximum = fimg_get_maxvalue(head);
-fprintf(fp, "#  maxval  %15f\n", maximum);
-fk = maximum / 65535.0;
-fprintf(fp, "# divisor  %15f\n", fk);
+if ( flags & 1 ) {
+	fprintf(stderr, "%s using fval/count %f %d -> %f\n", __func__,
+					head->fval, head->count,
+					head->fval * head->count);
+	fk = (head->fval * head->count) / 65535.0;
+	}
+else	{
+	maximum = fimg_get_maxvalue(head);
+	fk = maximum / 65535.0;
+	fprintf(fp, "#  maxval  %15f\n# divisor  %15f\n", maximum, fk);
+	}
+
 fprintf(fp, "65535\n");
 fflush(fp);