In QGIS I cannot make the resampling setting (changing it from nearest neighbour to bilinear or cubic) to smooth the pixels of Sentinel-2 imagery, both as jp2 or tif. If I export the image, convert it to png, georeference it, then the resampling works and the image pixels are smoothed out. Irfanview has no problem resampling jp2 or tiff.
I cannot find anything online describing this problem. Am I missing something that allow the jp2/tif resampling on QGIS?