@EricBowles Isn't Capture NX-D very old software? Download page takes you to NX Studio. I don't think you can get it now. Also the Compatible With page doesn't list the Z9. However when I got into NX Studio I see you can pick ProPhoto. What you get though for exporting is a choice of TIFF or JPG. So is his workflow to do this at the beginning?There is one other technique Vincent Versace mentioned. He believes that NX Studio is the best raw converter for Nikon files. In his fine art workflow, he wants the benefits of layers in Photoshop. In Photoshop he wants a ProPhotoRGB color space - the widest available - but ProPhoto is not an option for his output. So he sets up Capture NX-D as his Open With application. This lets him make RAW adjustments in NXStudio, carry those adjustments to Capture NX-D and then generate a ProPhoto raw conversion with his NXStudio adjustments from Capture NX-D.
I have not tried this, but Versace has been involved with Nikon software since the very early days so I respect his opinion.
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