X-Git-Url: http://research.m1stereo.tv/gitweb?a=blobdiff_plain;f=src%2Fmodules%2Fplus%2Ffilter_invert.c;h=3eb8c4a9657fdc581617cb48453fb23c199fc4c8;hb=8cf0f77981284b7549c811b67283eb73d0c520d6;hp=407a587768ec314fe134f13a0fe1e7d5726252c1;hpb=b57890c57a31e765cc53ba5835b21fb46ae1d2a6;p=melted

diff --git a/src/modules/plus/filter_invert.c b/src/modules/plus/filter_invert.c
index 407a587..3eb8c4a 100644
--- a/src/modules/plus/filter_invert.c
+++ b/src/modules/plus/filter_invert.c
@@ -26,6 +26,11 @@
 #include <stdlib.h>
 #include <math.h>
 
+static inline int clamp( int v, int l, int u )
+{
+	return v < l ? l : ( v > u ? u : v );
+}
+
 /** Do it :-).
 */
 
@@ -43,8 +48,8 @@ static int filter_get_image( mlt_frame this, uint8_t **image, mlt_image_format *
 
 		while ( p != q )
 		{
-			*p ++ = 251 - *r ++;
-			*p ++ = 251 - *r ++;
+			*p ++ = clamp( 251 - *r ++, 16, 235 );
+			*p ++ = clamp( 256 - *r ++, 16, 240 );
 		}
 	}