@ReedW @JamesMorgan
I trialled multiple RAW processors extensively recently. I ended up paying (more) for DXO (truth to be told, I wouldn't have bought anything if AI noise reduction tools weren't this damn good - as otherwise Darktable would be perfectly sufficient. Also, noise reduction in DXO is a lot more consistent than ON1, despite good results can be achieved with ON1 with the correct settings and perhaps masking.). I bought Affinity as well for potential editing or panorama/hdr merging.
ON1 Photo RAW 2024 seemed very promising (it would be so good with all its features if it was working well!), but something looked just a little bit strange with the colours it produced.
I managed to pinpoint it later in one of my photos: it has daffodils in a corner. Their middle is a visibly darker yellow tone (as it is in reality) in basically all editors, but ON1. When working with the RAW (from my Pana G9), the flowers look uniformly yellow. I couldn't bring out the difference by editing or playing around with different colour spaces.
And here's the twist: if I open a tiff (or jpg) produced by another editor, simply saving it with ON1 makes these yellows more uniform and washed out, without any modifications! So it is not a demosaicing issue I think. I tried ON1 Effects 2023 too, both standalone and as an Affinity plugin, it does the same. (The difference image feature of IrfanView comes very handy here.)
To illustrate this, I exported a 16-bit TIFF with sRGB colour space from DXO. I then simply opened it without any modifications except cropping in Affinity and ON1 (I did it with Effects as my Photo RAW trial ran out - starting from RAW with Photo RAW was even worse, beleive me).
I know, it is a
tiny part of the original image. Yet, quality differences lie in the small details.

Cropped and exported from Affinity

Cropped and exported from ON1

IrfanView difference image (zoomed in screenshot)
The difference is the biggest in the blue channel.
I inspected some other photos too, and came to the conclusion that ON1 somehow reduces colour detail.
Have you experienced similar quirks? I can share the original RAW privately if you would like to experiment.
Just for reference, roughly the same crop as above from the RAW developed with ON1:
