But, as the saying goes, "there is no free lunch". Lens corrections also have some downsides:
- Lens corrections result in a small reduction in sharpness. Sean Reid, at Reid Reviews has done extensive testing on this as part of his various lens reviews, and his conclusions are clear - there is a measurable loss in sharpness.
- Lens corrections result in some reduction in image size - the corrections inevitably result in the edges of the image curving, and the curved parts need to be trimmed off to get back to a straight edge.
- Firstly, convert the raw image to a DNG image, using Adobe's DNG converter.
- Then use DNG Cleaner (macOS only) to remove any opcodes.
Note that in order for this to work, you need DNG converter to be using it's default settings. Specifically, Compatibility should be set to the most recent version of Camera Raw. You should definitely not be using Custom Settings with the "Linear" checkbox selected. "Linear", otherwise known as LinearRaw, bakes any corrections into the actual data in the DNG, making it impossible to remove.
There's more information on the DNG Cleaner website.
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