If activated (and highlighted in red) all movements of the affected line will be mirrored by the opposite line. Each line additionally carries a “symmetry” button. Two red circles on each line allow you to modify the line positions with your mouse. full: Correct horizontal and vertical lines at the same timeĭepending on the selected correction type you will see two or four straight adjustment lines overlaid on your image.horizontal: Limit the correction to horizontal lines.vertical: Limit the correction to vertical lines.The combobox allows you to select the type of correction you want to use: This tool is useful, for example, when you shoot a high building from the ground with a short focal length, aiming upwards with your camera. keystone Correct perspective distortions. As soon as you release the mouse button the image is rotated so that the line you drew matches the horizontal or vertical axis. To use the mouse, right-click and drag to draw a line along a suitable horizontal or vertical feature. angle Correct the rotation angle to level an image by setting a numerical value in degrees or using the mouse. The crop and rotate module controls are split between two tabs as follows: 🔗main tab flip Flip the image on the horizontal, vertical or both axes. For best sharpness results set “lanczos3” as the pixel interpolator in preferences > processing. Note: Some of the tools in this module (angle adjustment and perspective distortion correction) require the original image data to be interpolated.
This process ensures that the entire image is available for source spots in retouch, since the crop module is placed after retouch in the pixelpipe. If you intend to use the retouch module, you are recommended to use rotate and perspective for rotation and/or keystone correction only, performing creative cropping in the crop module. Commit changes by giving focus to another module. Constrain movement to the horizontal/vertical axis by holding Ctrl/Shift, respectively while dragging. Move the crop rectangle by clicking and dragging inside the crop area. Resize the crop by dragging the border and corner handles. Whenever the user interface of this module is in focus, the full uncropped image will be shown, overlaid with crop handles and optional guiding lines. Please use the crop module to crop the image, the rotate and perspective module to perform rotation and keystone correction, and the orientation module to flip the image on the horizontal/vertical axes.Ĭrop, rotate, and correct perspective distortions using on-screen guides. Please note that this module is deprecated from darktable 3.8 and should no longer be used for new edits.
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