Crop and geometry

Crop and straighten

• Crop by dragging the handles. Lock the aspect ratio to keep a shape, or unlock it to crop freely.
• Aspect ratios include the original plus the usual fixed shapes, so you can commit to a square or a 16:9 without doing arithmetic.
• Rotate in degrees to level a horizon.
• Flip horizontally or vertically.

Upright

Upright analyses the photo on the device and corrects converging verticals — the backward lean buildings get when you tilt the camera up. It is the one-tap fix for architecture, and each mode makes a different trade between straightening the lines and keeping the framing.

Manual perspective

When Upright does not read the scene the way you would, correct it by hand:

• Vertical and horizontal correct the two axes of converging lines independently.
• Distortion bends the frame in or out to counter lens curvature.
• Aspect stretches the frame to compensate for the squashing that heavy perspective correction causes.
• Scale zooms the corrected image, and X and Y offset pan it inside the frame.

Perspective correction warps the image, which leaves empty wedges at the corners. Turn on the option to constrain the crop and Matisse shrinks the frame to hide them automatically, rather than leaving you to crop them out by eye.

Cropping is non-destructive like everything else. The pixels outside the crop are still there, so you can widen it again later or change the ratio entirely without losing anything.