p.1 #1 · LrC "Focus-Points" plugin straightens images by applying camera roll angle compensation
Version 3.3 of the Focus-Points plugin introduces a new feature that straightens images by compensating for the roll angle if the camera was tilted when the photo was taken. This method can be applied to individual images or selections.
The plugin generally produces better and more reliable results when correcting levels than Lightroom's Auto Transform feature. This is because it responds directly to horizontal camera imbalance, rather than looking for and using reference information, which is often absent or unreliable in wildlife, sports and action shots.
Example: The photo has a roll angle of 2.5°. Applying a crop angle of -2.5° compensates for the tilt. Using the ‘Straighten Images’ tool produces the same result as entering the roll angle compensation manually in Lightroom’s ‘Crop & Straighten’ tool. You can then modify or even revert the compensation as desired.
For an example and a summary, see README, or for a full description, see User Manual.
p.1 #3 · LrC "Focus-Points" plugin straightens images by applying camera roll angle compensation
Great idea. Thinking out loud, I wonder if the EXIF-reported roll angle is before or after IBIS correction. If it's before correction then the reported roll angle would probably overstate the actual roll angle of the captured image, which ostensibly would cause over-adjustment for software that relies on this field. Have you done any experiments with this?
p.1 #5 · LrC "Focus-Points" plugin straightens images by applying camera roll angle compensation
snapsy wrote:
I wonder if the EXIF-reported roll angle is before or after IBIS correction. If it's before correction then the reported roll angle would probably overstate the actual roll angle of the captured image, which ostensibly would cause over-adjustment for software that relies on this field. Have you done any experiments with this?
No, I haven't. A serious investigation would require access to cameras from different manufacturers, which I don't have. Also, I'm not willing to invest the effort required to get a good picture of this.
This works quite well for my Olympus/OM camera. I haven't received any feedback suggesting that it doesn't work in general, or in certain cases, for other cameras.
p.1 #6 · LrC "Focus-Points" plugin straightens images by applying camera roll angle compensation
schlotz wrote:
Note: Sony files not supported
Unfortunately, even the most recent Sony cameras do not store the required information in metadata. This applies to the known part of the manufacturer's notes (i.e. the information recognized by ExifTool) and any other location. I asked a Sony A7RV user to take a series of specific test images. My analysis showed no patterns in the metadata suggesting that Sony records roll angle information.
