fixed 8 bit filter 3

diff --git a/lib/png.c b/lib/png.c
index 95f5b11..8578d2d 100644 (file)
--- a/lib/png.c
+++ b/lib/png.c
@@ -197,6 +197,7 @@ static void applyfilter1(int mode, unsigned char*src, unsigned char*old, unsigne
     else if(mode==3) {
        for(x=0;x<width;x++) {
            *dest = *src+(*old+last)/2;
+           last = *dest;
            dest++;
            old++;
            src++;