diff --git a/floatimg.h b/floatimg.h
index 1ea38726..da2903ab 100644
--- a/floatimg.h
+++ b/floatimg.h
@@ -77,6 +77,7 @@ double fimg_timer_set(int whot);
 double fimg_timer_get(int whot);
 
 /*	--> lib/contrast.c		*/
+int fimg_id_contraste(char *name);
 int fimg_square_root(FloatImg *s, FloatImg *d, double maxval);
 int fimg_power_2(FloatImg *s, FloatImg *d, double maxval);
 int fimg_cos_01(FloatImg *s, FloatImg *d, double maxval);
diff --git a/lib/contrast.c b/lib/contrast.c
index 22323893..1cf0c0ea 100644
--- a/lib/contrast.c
+++ b/lib/contrast.c
@@ -12,6 +12,17 @@
 
 extern int		verbosity;
 
+/* ---------------------------------------------------------------- */
+int fimg_id_contraste(char *str)
+{
+
+if (!strcmp(str, "none")) 	return CONTRAST_NONE;
+if (!strcmp(str, "sqrt")) 	return CONTRAST_SQRT;
+if (!strcmp(str, "pow2")) 	return CONTRAST_POW2;
+if (!strcmp(str, "cos01")) 	return CONTRAST_COS01;
+
+return -1;
+}
 /* ---------------------------------------------------------------- */
 /*
  *	if the second parameter is NULL, operate 'in-place'
diff --git a/lib/runme.sh b/lib/runme.sh
index 35f07cc4..d38a4d3c 100755
--- a/lib/runme.sh
+++ b/lib/runme.sh
@@ -1,7 +1,7 @@
 #!/bin/bash
 
 
-../v4l2/grabvidseq -s 960x720 -n 10000 -p 0.078		\
+../v4l2/grabvidseq -s 960x720 -n 10000 -p 0.193	\
 			-vv -g -c none			\
 			-o original.fimg
 
diff --git a/v4l2/grabvidseq.c b/v4l2/grabvidseq.c
index c69632c1..41c9a642 100644
--- a/v4l2/grabvidseq.c
+++ b/v4l2/grabvidseq.c
@@ -64,16 +64,6 @@ if (r == -1) {
 	}
 }
 /* --------------------------------------------------------------------- */
-int contraste(char *str)
-{
-
-if (!strcmp(str, "sqrt")) 	return CONTRAST_SQRT;
-if (!strcmp(str, "pow2")) 	return CONTRAST_POW2;
-if (!strcmp(str, "cos01")) 	return CONTRAST_COS01;
-
-return -1;
-}
-/* --------------------------------------------------------------------- */
 void help(int v)
 {
 if (verbosity) {
@@ -128,7 +118,8 @@ FloatImg	cumul;
 
 while ((opt = getopt(argc, argv, "c:d:ghn:o:O:p:s:uv")) != -1) {
 	switch(opt) {
-		case 'c':	contrast = contraste(optarg);	break;
+		case 'c':	contrast = fimg_id_contraste(optarg);
+				break;
 		case 'd':	dev_name = optarg;		break;
 		case 'g':	to_gray = 1;			break;
 		case 'h':	help(0);			break;