diff --git a/floatimg.h b/floatimg.h
index 199ff818..06363a7c 100644
--- a/floatimg.h
+++ b/floatimg.h
@@ -3,7 +3,7 @@
  *			ugly code from tTh
  */
 
-#define		FIMG_VERSION	110
+#define		FIMG_VERSION	111
 
 /*
  *	in memory descriptor
@@ -145,6 +145,8 @@ int fimg_desaturate(FloatImg *src, FloatImg *dst, int k);
 /*	module funcs/geometry.c		*/
 int fimg_halfsize_0(FloatImg *src, FloatImg *dst, int notused);
 
+int fimg_displacement_0(FloatImg *psrc, FloatImg *pdst, int flags);
+
 /*	module funcs/rampes.c		*/
 int fimg_hdeg_a(FloatImg *img, double dcoef);
 int fimg_vdeg_a(FloatImg *img, double dcoef);
diff --git a/funcs/displacement.c b/funcs/displacement.c
index 9b2ed35c..9821d6c1 100644
--- a/funcs/displacement.c
+++ b/funcs/displacement.c
@@ -43,7 +43,6 @@ foo = fimg_get_minmax_rgb(psrc, minmax);
 if (verbosity) {
 	fimg_print_minmax(minmax, (char *)__func__);
 	}
-
 dltr = minmax[1] - minmax[0];
 dltg = minmax[3] - minmax[2];
 dltb = minmax[5] - minmax[4];
@@ -56,10 +55,10 @@ for (y=0; y<psrc->height; y++) {
 
 		fimg_get_rgb(psrc, x, y, rgb);
 
-		dispx = (float)x + (rgb[1]/dltg * 10.0);
+		dispx = (float)x + (rgb[1]/dltg * 20.0);
 		dispy = (float)y + (rgb[2]/dltb * 10.0);
-		dstx = (int)roundf(dispx - 5.0);
-		dsty = (int)roundf(dispy - 5.0);
+		dstx = (int)roundf(dispx - 10.0);
+		dsty = (int)roundf(dispy - 10.0);
 
 		if (		(dstx < 0) || (dsty < 0)	||
 				(dstx >= psrc->width)		||
@@ -69,7 +68,10 @@ for (y=0; y<psrc->height; y++) {
 			out++;
 			}
 		else	{
-			rgb[1] = rgb[2] = rgb[0];
+			if (flags & 1) {
+				/* going monochrome */
+				rgb[1] = rgb[2] = rgb[0];
+				}
 			fimg_put_rgb(pdst, dstx, dsty, rgb);
 			// fprintf(stderr, "%5d %5d %f\n", dstx, dsty, rgb[1]);
 			in++;
@@ -82,7 +84,7 @@ for (y=0; y<psrc->height; y++) {
 		}
 	}
 
-fprintf(stderr, "%s ------->  in %d  out %d\n", __func__, in, out);
+if (verbosity) fprintf(stderr, "%s -> in %d out %d\n", __func__, in, out);
 
 return 0;
 }
diff --git a/funcs/t.c b/funcs/t.c
index edb9079b..0782967b 100644
--- a/funcs/t.c
+++ b/funcs/t.c
@@ -17,8 +17,6 @@ float		global_fvalue;
 /* --------------------------------------------------------------------- */
 /* nouveau 24 octobre 2020, pendant le masque-flamme coronavidique       */
 
-int fimg_displacement_0(FloatImg *psrc, FloatImg *pdst, int flags);
-
 int essai_displacement(char *infile, char *outfile)
 {
 int		foo;
diff --git a/funcs/vroum.sh b/funcs/vroum.sh
index ce0b1a02..c6a6748e 100755
--- a/funcs/vroum.sh
+++ b/funcs/vroum.sh
@@ -6,7 +6,7 @@ out=out.fimg
 maxi=49
 W="640"
 H="480"
-grabopt=" -s 640x480 -vv  -p 0 -n 300 -c cos01 "
+grabopt=" -s 640x480 -vv  -p 0 -n 500 -c cos01 "
 
 mkdir /tmp/V