diff --git a/tools/fimgfx.c b/tools/fimgfx.c
index b6e8452..48ace93 100644
--- a/tools/fimgfx.c
+++ b/tools/fimgfx.c
@@ -21,7 +21,7 @@ typedef struct {
 	} Fx;
 
 enum fxid { Fx_cos01=5, Fx_cos010, Fx_pow2, Fx_sqrt, Fx_gray0, Fx_halfsz0,
-		Fx_rot90, Fx_cmixa,
+		Fx_rot90, Fx_cmixa, Fx_Desat,
 		Fx_xper };
 
 Fx fx_list[] = {
@@ -34,6 +34,7 @@ Fx fx_list[] = {
 	{ "rot90",		Fx_rot90,	0,	0 },
 	{ "cmixa",		Fx_cmixa,	0,	1 },
 	{ "xper",		Fx_xper,	0,	1 },
+	{ "desat",		Fx_Desat,	0,	1 },
 	{ NULL,			0,	0 }
 	};
 
@@ -166,6 +167,11 @@ switch (action) {
 		fprintf(stderr, "halfsize was not implemented\n");
 		return -3;
 
+	case Fx_Desat:
+		fimg_copy_data(&src, &dest);
+		foo = fimg_mix_rgb_gray(&dest, global_fvalue);
+		break;
+
 	default:
 		fprintf(stderr, "%s %s : %d is bad action\n",
 					__FILE__, __func__, action);
diff --git a/v4l2/funcs.c b/v4l2/funcs.c
index efc4cbb..a447452 100644
--- a/v4l2/funcs.c
+++ b/v4l2/funcs.c
@@ -34,7 +34,8 @@ extern int		verbosity;
 	    size_t  length;
     };
 
-    static char            *dev_name;
+static char            *dev_name;
+
     static enum io_method   io = IO_METHOD_MMAP;
     static int              fd = -1;
     struct buffer          *buffers;
@@ -48,10 +49,12 @@ static void errno_exit(const char *s)
 fprintf(stderr, "%s error %d, %s\n", s, errno, strerror(errno));
 exit(EXIT_FAILURE);
 }
+
 static int xioctl(int fh, int request, void *arg)
 {
 int r;
 
+/* PLEASE EXPLAIN THAT CODE */
 do	{
 	r = ioctl(fh, request, arg);
 	} while (-1 == r && EINTR == errno);
@@ -225,10 +228,11 @@ if (-1 == xioctl(fd, VIDIOC_QUERYCAP, &cap)) {
 	if (EINVAL == errno) {
 		fprintf(stderr, "%s is not a V4L2 device\n", dev_name);
 		exit(EXIT_FAILURE);
-		} else {
-			errno_exit("VIDIOC_QUERYCAP");
-		    	}
 		}
+		else {
+		errno_exit("VIDIOC_QUERYCAP");
+		}
+	}
 
 	if (!(cap.capabilities & V4L2_CAP_VIDEO_CAPTURE)) {
 		fprintf(stderr, "%s is no video capture device\n", dev_name);
diff --git a/v4l2/nc-camcontrol.c b/v4l2/nc-camcontrol.c
index cc5c8a2..fa2734d 100644
--- a/v4l2/nc-camcontrol.c
+++ b/v4l2/nc-camcontrol.c
@@ -25,13 +25,55 @@ void help(int n)
 
 puts("camera controls");
 puts("\t-d bla\t\tselect video device");
-
+puts("\t-e nnn\t\tset 'etype'");
+puts("\t-K nnn\t\tinteger parameter");
+puts("\t-n bla\t\tset title");
 exit(0);
+}
+/* --------------------------------------------------------------------- */
+int init_screen(char *title)
+{
+fprintf(stderr, ">>> %s ( '%s' )\n", __func__, title);
+return -1;
+}
+/* --------------------------------------------------------------------- */
+int preparation(char *devname, int param)
+{
+int			fd, foo;
+struct v4l2_capability	cap;
+
+fd = open_device(devname);
+if (fd < 0) {
+	fprintf(stderr, "err %d on %s opening\n", errno, devname);
+	return -2;
+	}
+
+/* est-ce un device qui permet la capture video */
+foo = ioctl(fd, VIDIOC_QUERYCAP, &cap);
+if (-1 == foo) {
+	perror("VIDIOC_QUERYCAP");
+	return -2;
+	}
+if (!(cap.capabilities & V4L2_CAP_VIDEO_CAPTURE)) {
+	fprintf(stderr, "%s is not a video capture device\n", devname);
+	return -3;
+	}
+
+return fd;
+}
+/* --------------------------------------------------------------------- */
+int interactive(int fd, int notused)
+{
+
+init_screen("prototype");
+
+fprintf(stderr, "file descriptor = %d\n", fd);
+
 }
 /* --------------------------------------------------------------------- */
 int main(int argc, char *argv[])
 {
-int		foo, opt;
+int		foo, opt, devnum;
 int		etype = 0;
 char		*device = "/dev/video0";
 char		*title = NULL;
@@ -44,11 +86,18 @@ while ((opt = getopt(argc, argv, "d:e:hK:lT:v")) != -1) {
 		case 'h':	help(0);		break;
 		case 'K':	K = atol(optarg);	break;
 		// case 'l':	liste_des_devices(0);	break;
+		case 't':	title = optarg;
 		case 'v':	verbosity++;		break;
 		}
 	}
 
+devnum = preparation(device, K);
+if (devnum < 0) {
+	fprintf(stderr, "%s : erreur init video device\n", argv[0]);
+	exit(1);
+	}
 
+foo = interactive(devnum, 0);
 
 return 0;
 }