[Gr4h4m (Graham)]

I was using the Screen Transfer Function in PixInsight yesterday, applying it to the histogram and then saving the image as a 16bit TIFF file to process further in Adobe Photoshop.

For some reason, when doing the same thing today, when I save the image from PixInsight I get a massively underexposed TIFF file, as if the STF didn't apply to the image properly.

The only thing I can't work out is why this is happening as I'm doing nothing different to what I did yesterday.

The first attached screenshot shows what the image looks like in PixInsight after I've applied the STF to the histogram. The second screenshot shows what the image looks like once I've saved it as a 16bit TIF.

Any ideas?