ON1 Photo RAW 2018 uses two different RAW engines: Tier 1 RAW engine and Tier 2 LibRAW library. Which engine is used for which camera can be found here: ON1 Photo RAW 2017.7 and 2018.5 - Compatible File Types and Supported Cameras
But be warned! Only full RAW for Tier1 cameras are processed by the Tier 1 RAW engine. Formats like mRAW (medium) and sRAW (small) for Tier 1 cameras are processed by the Tier 2 LibRAW library (at least for my Canon 70D)
- How is the Tier 1 engine different from the Tier 2 engine?
- Why does ON1 use two different RAW engines?
I have the impression that the Tier 2 engine is not actually a RAW processor. For example, when processing a mRAW photo of a Canon 70D (Tier 1 camera, but mRAW is Tier 2 processing) with extreme highlights (see Issues with blown highlights), the highlights on the image appear similar to a JPG image. So I suspect that the Tier 2 processing actually converts the (mRAW) image to a bitmap format (e.g. TIFF) and then processes the image as a bitmap (like TIFF, JPG, PNG). In that case, Tier 2 processing would lose the advantages of RAW processing, and extreme highlights or color balance in Kelvin (see this thread) cannot be recovered and corrected like with real RAW images.
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