diff --git a/floatimg.h b/floatimg.h
index 190d761..624ddc4 100644
--- a/floatimg.h
+++ b/floatimg.h
@@ -4,7 +4,7 @@
  *	http://la.buvette.org/photos/cumul
  */
 
-#define		FIMG_VERSION	133
+#define		FIMG_VERSION	134
 
 /*
  *	in memory descriptor
@@ -210,7 +210,7 @@ void fimg_print_minmax(float minmax[6], char *titre);
 int parse_WxH(char *str, int *pw, int *ph);
 int parse_double(char *str, double *dptr);
 int format_from_extension(char *fname);
-
+char * extension_from_format(int fmt);
 
 
 
diff --git a/tools/fimgfx.c b/tools/fimgfx.c
index 71d6de5..92817fb 100644
--- a/tools/fimgfx.c
+++ b/tools/fimgfx.c
@@ -22,6 +22,7 @@ typedef struct {
 
 enum fxid { Fx_cos01=5, Fx_cos010, Fx_pow2, Fx_sqrt, Fx_gray0, Fx_halfsz0,
 		Fx_rot90, Fx_cmixa, Fx_desat, Fx_ctr2x2, Fx_norm,
+		Fx_classtrial,
 		Fx_xper, Fx_binarize, Fx_trinarize,Fx_hilight_R };
 
 Fx fx_list[] = {
@@ -37,6 +38,7 @@ Fx fx_list[] = {
 	{ "desat",		Fx_desat,	0,	1 },
 	{ "ctr2x2",		Fx_ctr2x2,	0,	1 },
 	{ "norm",		Fx_norm,	0,	1 },
+	{ "classtrial",		Fx_classtrial,	0,	1 },
 	{ "binarize",		Fx_binarize,	0,	1 },
 	{ "trinarize",		Fx_trinarize,	0,	1 },
 	{ "hilightr",		Fx_hilight_R,	0,	1 },
@@ -149,6 +151,7 @@ if (fx_list[fxidx].flags & 1) {
 else	{
 	fprintf(stderr, "%s: ???\n", __func__);		/* XXX */
 	memset(&dest, 0, sizeof(dest));
+	return -888;
 	}
 
 action = fx_list[fxidx].id;
@@ -182,6 +185,12 @@ switch (action) {
 		fprintf(stderr, "see 'fimghalfsize.c'. \n");
 		return -3;
 
+	case Fx_classtrial:
+		fprintf(stderr, "classif trial with %f fvalue\n",
+						global_fvalue);
+		foo = fimg_classif_trial(&src, &dest, global_fvalue, 0);
+		break;
+
 	case Fx_desat:
 		fimg_copy_data(&src, &dest);
 		foo = fimg_mix_rgb_gray(&dest, global_fvalue);