diff -r 02501812b0e1 -r 01de253f3bbf src/lib/cache.c
--- a/src/lib/cache.c	Tue Dec 29 15:34:09 2009 +0200
+++ b/src/lib/cache.c	Tue Dec 29 15:34:18 2009 +0200
@@ -411,8 +411,8 @@
  */
 static inline void tile_row_fill_clip (struct pt_cache *cache, png_byte *row, size_t width_px)
 {
-    // XXX: use a defined background color, or full transparency?
-    memset(row, 0, width_px * cache->header->col_bytes);
+    // XXX: use a configureable background color, or full transparency?
+    memset(row, /* 0xd7 */ 0x00, width_px * cache->header->col_bytes);
 }
 
 /**