You can always change the resolution of an imported image.
Or any image for that matter.
Resolution just means how tightly the pixels were packed together
when the image was created. The tighter the pixels are packed
together, the sharper and more vivid the colors. Stretch an image
out larger and the pixels get farther apart and the picture loses its
sharpness and looks dull.
Try importing a large image into Revit and then shrink it down
with its grips and watch it get sharp and vivid. That's what changing
the resolution is.
