[gdal-dev] gdalwarp for interpolation of non georeferenced images?

[WolfgangZ]

Hi,

is it possible to use gdalwarp to interpolate non georeferenced images? 
I thought of something like "gdalwarp -tr 0.2 0.2 -r cubic in.tif 
out.tif" but all I get is:


ERROR 1: Unable to compute a transformation between pixel/line
and georeferenced coordinates for test1.tif.
There is no affine transformation and no GCPs.

Thanks for any help.
Wolfgang