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### 4.3. Rotate Tool

The wilber opened in the RGBA mode. The Rotate Tool is used to rotate layers or selections.

#### Overview

When you click on the image or the selection with this tool, a grid or an outline is superimposed and a Rotation Information dialog is opened. There, you can set the rotation axis, marked with a point, and the rotation angle. You can do the same by dragging the mouse pointer on the image or the rotation point.

#### Activate Tool

- The Rotate Tool can be called in the following order, from the image-menu: Tools/ Transform Tools/Rotate .

- The Tool can also be called by clicking the tool icon:

#### Key modifiers (Defaults)

Shortcut

  The Shift-r key combination will change the active tool to Rotate.

Ctrl

  Holding Ctrl will constrain the rotation angles to those only evenly divisible by 15 degrees.

Options

Overview

  The available tool options for the Rotate Tool can be accessed by double clicking the Rotate Tool icon.

Affect

  The Rotate tool can affect the Layer, the Selection, and the Path differently. These three buttons associate the remainder of the options to one of those three elements. Remind that this option persists when you quit the tool.

Transform Direction

  The Transform Direction sets which way or direction a layer is rotated. The Traditional mode will rotate the layer as one might expect. If a layer is rotated 10 degrees to the right, then the layer will be rendered as such. This behaviour is contrary to Corrective rotation.

  Corrective Rotation is primarily used to repair scanned images that are not straight. If the image is 13 degrees askew then you need not try to rotate by that angle. By using Corrective Rotation you can rotate visually and line up the layer with the image. Because the transformation is reversed, or performed backwards, the image will be rotated with sufficient angle to correct the error.

Interpolation

  The Interpolation drop-down list allows you to choose the quality of the transformation. For more information about the different methods that can be employed, see the glossary entry Interpolation.

Supersampling

  See glossary for Supersampling

Clip Result

  This option will clip the transformated image to the original image size.

Preview

  Here, Preview is superimposed on the image. The drop-down list gives you four possibilities:

  1. Outline: Puts a frame to mark the image outline, with a handle on each corner. Movements will affect this frame only.

  2. Grid: Puts a grid on the image, with four handles. Movements will affect this grid only.

  3. Image: Here, the preview is a copy of the image superimposed on the image, with an outline. Movements affect this copy and the underlying image appears.

  4. Grid+Image: Both turn at the same time.

  Preview is only for greater convenience. Whatever your choice, result will be the same when you clic on the Rotate button in the Rotate Informations dialog.

  Options with grid activate a drop-list with two options: Number of Grid Lines will allow control over the total number of displayed grid lines. Use the slider to set the number of grid lines. Grid Line Spacing allows control over the distance between the grid lines. Use the slider to set the distance.

  | Note
  When rotating a path, Preview options are not valid: only Outline is active.

Constraints

  15 Degrees will constrain the rotation to angles divisible by 15 degrees.

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