Resampling raster files

Hi everybody,

my question is about the display quality of QGis. In my GIS (working with 
GRASS6.1) I have Spot V images (2.5m, color) reprojected in Old Egyptian system 
(instead of original WGS84) et in GRASS and in QGis, it seems that the 
resolution is lower on the screen that it is when we look at the original TIFF 
files (in GIMP for example)...
Is it real or just a feeling ?

Thanks !