Saving as TIFF before stretching WILL give you very low level. I find you need to stretch before saving as TIFF. Maxim is the same. If i save the file as TIFF before i stretch it, i find i lose all my data and, like you, image is really weak, and very dark.
Try and stretch before exporting into a TIFF format.
Regards
Theo
OK, next time, I'll save the DSS result as FIT file and stretch it with PixInsight which is able to read it.
Michel
