I'm using a program that generates a map using a set of colors (radio signal strength ranges, to be specific). It outputs the file as a jpg image with KML, so it displays perfectly well in Google Earth and in any photo viewer. But when I try to read it into QGIS (I've got 3.2 installed now), the raster processing functions seem to demand that they take over and replace the colors. Using palleted unique values, I was able to painstakingly regenerate something close to the original, but none of the options seem to just want to display the colors as the jpg file shows them.
Is there a trick I'm missing?