Which raster format are you writing to?

Nodata has no colour, as such, it's just a placeholder for "there's nothing here", or NULL in database terminology.

But depending on which program you use to look at the raster, you can tell it to render the nodata cells as a particular colour, e.g. white or black are common choices. But this is usually somthing you do in the client program, not in FME.

it's jp2

FRAD045_3P_79_3_0001.zip

Thank you David,

Indeed it most be done in the client program.

Marion