add a new (and funny) contrast adjustement

v4l2/grabvidseq.c

@@ -234,8 +234,10 @@ cumul.count = 0;
 type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 xioctl(fd, VIDIOC_STREAMON, &type);
 
+#if 0
 if (verbosity)	fprintf(stderr,"pid %d grabbing %d picz...\n",
 					getpid(), nbre_capt);
+#endif
 
 for (i = 0; i < nbre_capt; i++) {
 	do	{
@@ -331,7 +333,7 @@ if (verbosity) {
 	}
 switch (contrast) {
 	case CONTRAST_NONE:
-		fprintf(stderr, "contrast: none\n");
+		// if (verbosity) fprintf(stderr, "contrast: none\n");
 		break;
 	case CONTRAST_SQRT:
 		fimg_square_root(&cumul, NULL, maxvalue);