[Gdal-dev] Using +nadgrids=@null with gdal

[ValiSystem]

	Hello list,

I'd like to use the +nadgrids=@null trick described in the last entry  
of proj FAQ (http://proj.maptools.org/faq.html), it works perfectly  
with cs2cs, but i can't make it work with gdal, lat lon of corners of  
my image are modified.

Is this normal ? Is there another way to achieve that (i'd like to  
avoid copying entire file using gdal_translate +a_ullr option) ?