December 6, 2025
Rotate and Perspective – For straight horizons and perfect architecture
What is it about?
Nothing ruins a good landscape or architectural photo faster than a crooked horizon or converging lines (when buildings seem to “topple” backwards). The “Rotate and Perspective” module is your tool for the geometric correction of the image.
The most important functions:
- Rotation: Corrects a crooked horizon.
- Keystone Correction: Aligns vertical and horizontal lines so that buildings stand straight.
- Automatic Cropping: Automatically adjusts the image after rotation so that no black edges appear.
How to apply it:
The easiest way is the automatic structure detection.
- Open the module.
- Click on the icon for “Automatically detect structure” (often an icon with lines).
- Darktable analyzes the image for straight lines and aligns it automatically.
- You can manually readjust using the “Rotation” slider.
Pro Tip: Quick alignment via mouse
You often don’t even have to open the module to align the image. Simply hold down the right mouse button in the darkroom and draw a line along the horizon. As soon as you release, Darktable rotates the image straight.
Genius: This works just as well for vertical lines! Simply draw the line along the edge of a building or a pole, and Darktable aligns the image to it.