ChatGPT said:
Thanks for the detail. Your observation matches known behavior:
Lightroom Classic vs. Lightroom (Desktop) with ORF Files and Denoise AI
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Lightroom Classic (as of mid-2023 onward) supports Denoise AI with many raw formats, including Olympus .ORF files (from your OM-D E-M5 Mark III).
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Lightroom (Desktop) may fail or not support Denoise AI on certain raw formats, especially if they’re not fully supported in the cloud-native processing pipeline.
Why This Happens
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Lightroom Classic uses a local, full-featured processing engine that supports broader raw compatibility.
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Lightroom (Desktop) is cloud-integrated, and Adobe appears to have more limitations in Denoise support, possibly prioritizing newer or more common formats (like CR3, NEF, ARW, etc.).
Adobe’s official list of supported formats for Denoise AI in Lightroom Desktop may exclude older or less-common Micro Four Thirds files—even if they work fine in Classic.
Workaround Options
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Use Lightroom Classic for Denoising ORF files and then:
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Sync the DNG result to Lightroom Desktop.
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Or export and re-import if syncing isn't active.
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Use Adobe DNG Converter first (though unlikely to help, since Classic works fine with native ORFs).
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Use Topaz Denoise AI as an external editor if you prefer the Lightroom (Desktop) environment.
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