Francisco: As part of my initial experimentation after acquisition of DxO, I converted a previous raw capture from my Lightroom directory using both the DxO tiff and dng conversion options. I saved both of these back into my Lightroom directory which contained the initial raw capture, and then was able to process both -- the DxO-converted tiff and dng -- with my Silver Efex Pro 2 plug-in to Lightroom. SEP handled both the tiff and dng seemingly equally well. Are there any lessons to be learned from this "experiment," beyond the apparent fact that for SEP use, it doesn't seem to matter whether I save the DxO conversion as either tiff or dng? Many thanks for you clarification of these matters for me. Regards, Jim
What happes is that LR converts the dng to tiff before sending it to SEP. I would basically decide on which choice of format depending on wheter further edits on the image will be performed in LR before going to SEP.
Advantages of using DXO dng if you edit the image in LR:
- You can apply a DNG profile. You can even produce a custom DNG profile from a DXO dng file with the xrite tool
- White balance performed to linear data
- More highlight recovery capability*
If you perform all preliminary edits in DXO and would use SEP from DXO if you had the chance, then just work in tiff.
I did some tests in DXO, especially with the dng options in this thread
* There is a interesting issue about what happens if you have clipped raw values, which I explain in the mentioned thread. Basically if your original raw file has any clipped highlights, it is recommended to white balance the image in DXO even if you output to dng.