This information applies to all versions
When shooting at the shortest focal length of the lens, you may notice dark corners in RAW images opened in DxO PhotoLab or DxO PureRAW.
These are not traditional optical vignetting. At the shortest focal length, the extreme edges of the lens barrel may be physically captured by the sensor and become visible in the image.
DxO PhotoLab and DxO PureRAW read and process the entire sensor area, while many in-camera JPEGs and some third-party applications automatically apply a slight crop that removes these outer areas.
You can verify this by comparing the framing: the in-camera JPEG usually shows a slightly tighter crop than the RAW image processed in DxO software.
DxO preserves the full captured image data for optimal demosaicing and optical corrections. The additional image data at the edges can also be helpful when using the ReTouch tool in DxO PhotoLab or other local adjustment tools in third-party software.
To remove the dark corners and match the in-camera JPEG framing, select the “Original” aspect ratio in DxO PhotoLab or DxO PureRAW. In DxO PhotoLab, this option is enabled by default in the standard presets. Alternatively, you can crop the image manually.