diff --git a/pipi/context.c b/pipi/context.c
index 5c66c35..31e3bb5 100644
--- a/pipi/context.c
+++ b/pipi/context.c
@@ -118,14 +118,19 @@ int pipi_command(pipi_context_t *ctx, char const *cmd, ...)
         pipi_image_t *src, *dst;
         char const *arg;
         va_list ap;
+        double w, h;
 
         if(ctx->nimages < 1)
             return -1;
         va_start(ap, cmd);
         arg = va_arg(ap, char const *);
         va_end(ap);
+        w = h = atof(arg);
+        arg = strchr(arg, 'x');
+        if(arg)
+            h = atof(arg + 1);
         src = ctx->images[ctx->nimages - 1];
-        dst = pipi_gaussian_blur(src, atof(arg));
+        dst = pipi_gaussian_blur_ext(src, w, h, 0.0, 0.0);
         if(dst == NULL)
             return -1;
         pipi_free(src);