diff --git a/libavcodec/dvbsubdec.c b/libavcodec/dvbsubdec.c
index e268e2a38e..9f59b7259f 100644
--- a/libavcodec/dvbsubdec.c
+++ b/libavcodec/dvbsubdec.c
@@ -754,6 +754,63 @@ static int dvbsub_read_8bit_string(AVCodecContext *avctx,
     return pixels_read;
 }
 
+static void compute_default_clut(AVPicture *frame, int w, int h)
+{
+    uint8_t list[256] = {0};
+    uint8_t list_inv[256];
+    int counttab[256] = {0};
+    int count, i, x, y;
+
+#define V(x,y) frame->data[0][(x) + (y)*frame->linesize[0]]
+    for (y = 0; y<h; y++) {
+        for (x = 0; x<w; x++) {
+            int v = V(x,y) + 1;
+            int vl = x     ? V(x-1,y) + 1 : 0;
+            int vr = x+1<w ? V(x+1,y) + 1 : 0;
+            int vt = y     ? V(x,y-1) + 1 : 0;
+            int vb = y+1<h ? V(x,y+1) + 1 : 0;
+            counttab[v-1] += !!((v!=vl) + (v!=vr) + (v!=vt) + (v!=vb));
+        }
+    }
+#define L(x,y) list[ frame->data[0][(x) + (y)*frame->linesize[0]] ]
+
+    for (i = 0; i<256; i++) {
+        int scoretab[256] = {0};
+        int bestscore = 0;
+        int bestv = 0;
+        for (y = 0; y<h; y++) {
+            for (x = 0; x<w; x++) {
+                int v = frame->data[0][x + y*frame->linesize[0]];
+                int l_m = list[v];
+                int l_l = x     ? L(x-1, y) : 1;
+                int l_r = x+1<w ? L(x+1, y) : 1;
+                int l_t = y     ? L(x, y-1) : 1;
+                int l_b = y+1<h ? L(x, y+1) : 1;
+                int score;
+                if (l_m)
+                    continue;
+                scoretab[v] += l_l + l_r + l_t + l_b;
+                score = 1024LL*scoretab[v] / counttab[v];
+                if (score > bestscore) {
+                    bestscore = score;
+                    bestv = v;
+                }
+            }
+        }
+        if (!bestscore)
+            break;
+        list    [ bestv ] = 1;
+        list_inv[     i ] = bestv;
+    }
+
+    count = i - 1;
+    for (i--; i>=0; i--) {
+        int v = i*255/count;
+        AV_WN32(frame->data[1] + 4*list_inv[i], RGBA(v/2,v,v/2,v));
+    }
+}
+
+
 static int save_subtitle_set(AVCodecContext *avctx, AVSubtitle *sub, int *got_output)
 {
     DVBSubContext *ctx = avctx->priv_data;
@@ -855,6 +912,9 @@ static int save_subtitle_set(AVCodecContext *avctx, AVSubtitle *sub, int *got_ou
 
             memcpy(rect->pict.data[0], region->pbuf, region->buf_size);
 
+            if (clut == &default_clut)
+                compute_default_clut(&rect->pict, rect->w, rect->h);
+
             i++;
         }
     }