P: Lens corrections don't work with HDRs merged from DNGs
Lens corrections don't work with Photo Merge HDRs merged from DNGs. They do work correctly with DNGs not produced by Photo Merge.
Tested with LR 14.3.1 / Mac OS 15.5:
1. Download and open this catalog:
It contains raws from five cameras: Canon EOS R6m2, Fujifilm X-T5, Nikon Z 7_2, ODS OM-1, Sony ILCE-7C. All the raws have Lens Corrections > Enable Profile Corrections checked.
2. Observe that for each camera, there are three stacks containing these stack tops:
- an HDR made from two copies of the original raw, e.g. DSC_0102-HDR.dng.
- an HDR made from full-resolution DNGs exported from two copies of the raw with the options Image Format: DNG, Lossy Compression, e.g. DSC_0102-full.dng.
- an HDR made from reduced-resolution DNGs exported from two copies of the raw with the options Image Format: DNG, Lossy Compression, and Resize To Fit: Long Edge = 3000, e.g. DSC_0102-small.dng.
3. For each camera, compare the three HDRs in Loupe. Observe that the HDR merged from reduced-resolution DNGs is missing some corrections for distortion and vignetting compared to the DNG merged from raws. E.g. DSC09289-small.dng versus DSC09289-HDR.dng.
4. Observe that for the Nikon Z 7_2 only, the HDR merged from the full-resolution DNGs is missing corrections for vignetting (DSC_0102-full-HDR versus DSC_0102-HDR.dng). But for the other four cameras, the DNGs merged from full-resolution DNGs have the correct lens corrections.
5. Compare a raw with its corresponding full-resolution and reduced-resolution DNGs. E.g. DSC09289.ARW, DSC09289-full.dng, and DSC09289-small.dng. Observe that they look identical and that the DNGs aren't missing lens corrections.
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