Neg lab pro turning images into negatives rather than positives

Hi - I’ve only just come to learn about Negative lab Pro. Unfortunately it’s after I’ve spent several weeks creating a new archive of old work making over 500 35mm scans on my VueScan. Thing is I scanned them as 48bit Tiff. When I use the Negative Lab Pro it’s turning them into negatives rather than the already exisiting positives. I’m sure it’s super simple though I can’t find out what I’m doing wrong and have looked across the instruction manuals.
Any help would be great.

Hi, Negative Lab Pro is intended to be used on negative film that hasn’t already been converted… so if you’ve used Vuescan to already convert the negatives into positive images, you cannot use Negative Lab Pro on them.

If you want to use Negative Lab Pro with Vuescan, check out the specific instructions for creating RAW DNGs with Vuescan. This will give you raw negative scans that Negative Lab Pro is expecting.