Keystone Correction Pro

Keystone / Crop / Rotation / Lens Correction

Video Tutorial – Keystone Correction

Peter Eastway demonstrates how to use Capture One Pro to reduce or eliminate perspective distortion. The tool is particularly useful for correcting the verticals of a building that have been captured at a low angle.

Apply Keystone Correction Manually

  1. Go to the Composition tool tab.
  2. In the Keystone tool, adjust the Vertical or Horizontal sliders.
  3. Adjust the Amount slider.
  4. Fine-tune Aspect if necessary.

keystone_slider

To Apply Horizontal or Vertical Keystone Correction

  1. Go to the Composition tool tab.
  2. In the Keystone tool, select the Keystone Horizontal or the Keystone Vertical icon.
  3. Set the four points to mark up the vertical or horizontal lines that need to be aligned.
  4. Press the Apply button (Located on the top of the image).
  5. Adjust the Amount and Aspect as desired.

To Apply Automatic Vertical and Horizontal Keystone Correction

  1. Go to the Composition tool tab.
  2. In the Keystone tool, select the Keystone icon.
  3. Set the four points to mark up the vertical or horizontal lines that need to be aligned.
  4. Press the Apply button (located on the top of the image).

To Hide Distorted Edges

There may be occasions when you need to hide the distorted edges after applying a keystone correction.
Check mark Hide Distorted Areas in Lens tool.

In rare situations you might need to crop outside the image. See To Crop Outside Image Area.

  1. Go to Lens Correction tool tab.
  2. Check mark the Hide Distorted Areas option.
  3. Distorted edges will now automatically be clipped.

Auto Rotate for IQ-series Digital Back Users

The IQ-series digital backs have an integrated motion sensor that automatically logs the angle of a captured image. Press the A icon in the Keystone tab to correct an image so that the horizontal angle is square to the ground. If, for example, an image has been captured looking up at a tall building with any perspective distortion, then the A (Auto) function will also correct any converging verticals.

Note: Applying a Keystone setting will also adjust the rotation of an image. If you want to undo Keystone setting and the rotation remember to press the undo icon for both individual adjustments.

Auto rotate

Learn More

The photo to the left is corrected 80% the photo to the right is 100% corrected.

When applying Vertical Keystone correction the default is set to 80%. In most cases the 80% correction will give a natural appearance, but if needed, you can adjust manually by dragging the Keystone sliders.

The Keystone correction works optically (like a true large format camera) by adjusting each corner individually to adjust the selected lines. The aspect slider will trim the corrected photo.

The Aspect slider will alter the aspect ratio of the shot and can be used to adjust the Keystone corrected shot. It will preserve the crop and create a more realistic look.