diff --git a/Fonderie/glitches.c b/Fonderie/glitches.c
index 15a3af6b..5ede29ff 100644
--- a/Fonderie/glitches.c
+++ b/Fonderie/glitches.c
@@ -10,12 +10,12 @@
 extern int		verbosity;
 
 /*   --------------------------------------------------------------   */
-int kill_a_random_line(FloatImg *pvictime, float fval, int notused)
+int kill_a_random_line(FloatImg *pvictime, float fval, int bits)
 {
 int		line, xpos, offset;
 
 #if DEBUG_LEVEL
-fprintf(stderr, ">>> %s ( %p %d )\n", __func__, pvictime, notused);
+fprintf(stderr, ">>> %s ( %p %d )\n", __func__, pvictime, bits);
 #endif
 
 line = rand() % pvictime->height;
@@ -27,9 +27,12 @@ if (verbosity > 1) {
 offset = pvictime->width * line;
 
 for (xpos=0; xpos<pvictime->width; xpos++) {
-	pvictime->R[offset+xpos] = fval;
-	pvictime->G[offset+xpos] = 0.0;
-	pvictime->B[offset+xpos] = fval;
+	if (bits & 1)	pvictime->R[offset+xpos] = fval;
+	else		pvictime->R[offset+xpos] = 0.0;
+	if (bits & 2)	pvictime->G[offset+xpos] = fval;
+	else		pvictime->G[offset+xpos] = 0.0;
+	if (bits & 4)	pvictime->B[offset+xpos] = fval;
+	else		pvictime->B[offset+xpos] = 0.0;
 	}
 
 return 0;
@@ -41,7 +44,7 @@ int		idx, foo;
 
 /* Frag the pixels */
 for (idx=0; idx<number; idx++) {
-	foo = kill_a_random_line(who, fval, 0);
+	foo = kill_a_random_line(who, fval, rand() & 0x0f);
 	if (foo)	abort();
 	}
 
diff --git a/Fonderie/glitches.h b/Fonderie/glitches.h
index 9e7ccef8..09290447 100644
--- a/Fonderie/glitches.h
+++ b/Fonderie/glitches.h
@@ -2,8 +2,7 @@
  * 		glitches.h
  */
 
-int kill_a_random_line(FloatImg *pvictime, float level, int notused);
+int kill_a_random_line(FloatImg *pvictime, float level, int bits);
 int kill_a_few_lines(FloatImg *who, float fval, int number);
 
-
 /* this is a wtf file */
diff --git a/Fonderie/interpolator.c b/Fonderie/interpolator.c
index 8bcc2761..03fc2ae6 100644
--- a/Fonderie/interpolator.c
+++ b/Fonderie/interpolator.c
@@ -45,8 +45,13 @@ if (0 == globbuf.gl_pathc) {
 	}
 
 foo = fimg_fileinfos(globbuf.gl_pathv[0], iarray);
+if (FIMG_TYPE_RGB != iarray[2]) {
+	fprintf(stderr, "can work only on RGB fimg picture, was %d\n",
+							iarray[2]);	
+	exit(1);
+	}
 w = iarray[0], h = iarray[1];
-fprintf(stderr, "\tfirst image size : %dx%d\n", w, h);
+fprintf(stderr, "first image size : %dx%d\n", w, h);
 
 fimg_create(&A,   w, h, 3);	pFirst  = &A;
 fimg_create(&B,   w, h, 3);	pSecond = &B;
@@ -78,7 +83,7 @@ for (idx=0; idx<globbuf.gl_pathc; idx++) {
 		fimg_interpolate(pSecond, pFirst, &Out, coef);
 
 		/* here we can insert the output filter */
-		kill_a_few_lines(&Out, 3.14159, 500);
+		kill_a_few_lines(&Out, 150.5, 5+(rand()%20));
 
 		sprintf(line, "%s/%05d.png", outdir, ipng);
 		foo = fimg_save_as_png(&Out, line, 0);
@@ -127,8 +132,9 @@ fprintf(stderr, "*** %s : compiled by tTh, %s %s\n", __FILE__,
 			__DATE__, __TIME__);
 fimg_print_version(2);
 
-while ((opt = getopt(argc, argv, "v")) != -1) {
+while ((opt = getopt(argc, argv, "hv")) != -1) {
 	switch(opt) {
+		case 'h':	help();			break;
 		case 'v':	verbosity++;		break;
 		}
 	}