diff --git a/funcs/t.c b/funcs/t.c
index 2a8dc12..50a7734 100644
--- a/funcs/t.c
+++ b/funcs/t.c
@@ -35,11 +35,15 @@ else	{
 
 foo = fimg_save_as_pnm(&fimg, "source.pnm", 0);
 
-for (idx=0; idx<20; idx++) {
+/*
+ *	running multiple filters so you can
+ *	watch the up-left shift :)
+ */
+for (idx=0; idx<10; idx++) {
 	foo = fimg_lissage_2x2(&fimg);
 	foo = fimg_killborders(&fimg);
-	sprintf(buffer, "filter%03d.pnm", idx);
-	foo = fimg_save_as_pnm(&fimg, buffer, 0);
+	sprintf(buffer, "filter%03d.png", idx);
+	foo = fimg_save_as_png(&fimg, buffer, 0);
 	}
 
 fimg_destroy(&fimg);
@@ -54,7 +58,11 @@ int		foo;
 
 if (NULL != infile) {
 	fprintf(stderr, "loading %s\n", infile);
-	fimg_create_from_dump(infile, &fimg);
+	foo = fimg_create_from_dump(infile, &fimg);
+	if (foo) {
+		fprintf(stderr, "%s: err load '%s'\n", __func__, infile);
+		return foo;
+		}
 	}
 else	{
 	fimg_create(&fimg, 512, 512, FIMG_TYPE_RGB);
@@ -85,7 +93,11 @@ int		foo;
 
 if (NULL != infile) {
 	fprintf(stderr, "loading %s\n", infile);
-	fimg_create_from_dump(infile, &fimg);
+	foo = fimg_create_from_dump(infile, &fimg);
+	if (foo) {
+		fprintf(stderr, "%s: err load '%s'\n", __func__, infile);
+		return foo;
+		}
 	}
 else	{
 	fimg_create(&fimg, 512, 512, FIMG_TYPE_RGB);