PDF-xChange keeps text as text if printed normally, completely selectable, vectorized, but changes and rasterises it to image if printed as image, pixelated and

PDF-xChange keeps text as text if printed normally, completely selectable, vectorized, but changes and rasterises it to image if printed as image, pixelated and jpeg-ized. At about 200% zoom it is clearly visible that it is pixelated, and nothing else.