diff --git a/examples/img2rubik.c b/examples/img2rubik.c
index 12a15d1..70dd563 100644
--- a/examples/img2rubik.c
+++ b/examples/img2rubik.c
@@ -422,6 +422,9 @@ int main(int argc, char *argv[])
             double yb = rgbhull->pts[slice][(n + 1) % count][Y];
             double t = (xp * (yb - ya) - yp * (xb - xa)) / (xa * yb - xb * ya);
 
+            if(t > 1.0)
+                t = 1.0;
+
             debug("    best RGB %g (%g,%g) (%g,%g)\n", t, xa, ya, xb, yb);
 
             /* 2. apply the excentricity in reduced space. */