Added xscanimage problem with gamma tables.

Henning Meier-Geinitz <henning@meier-geinitz.de>

TODO

@@ -1,10 +1,14 @@
-TODO (2001-06-09)
+TODO (2001-10-13)
 
 ******** todo ********
 
   * Don't use sanei functions that are also defined in sane-backends
 
-  * add new frondends (?)
+  * xscanimage: Gamma table seems to ignore maximum value. E.g. for
+    an 8-bit (0-255) gamma table, the last entry may be set to 256 when
+    setting the gamm value.
+
+  * add new frontends (?)
      - scanadf, http://www.martoneconsulting.com/sane-scanadf.html
 
   * xcam: support depths > 8 bits/channel