### 5.19. Curve Bend

#### 5.19.1. Overview

图 17.106. Applying example for the Curve Bend filter

Original image

Filter applied

This filter allows you to create a curve that will be used to distort the active layer or selection. The distortion is applied gradually from an image or selection border to the other.

| 注意
If the image is in indexed mode, this menu entry is disabled.

#### 5.19.2. Activating the Filter

This filter is found in the main menu under Filters → Distorts → Curve Bend….

#### 5.19.3. Options

图 17.107. “Curve bend” filter options

Preview

  The preview displays changes to image or selection without modifying the image until you press OK.

  Preview once

    This button allows you to update the preview each time you need it.

  Automatic preview

    With this option, preview is changed in real time. This needs much calculation and may lengthen work. It is particularly evident when using “Rotation”.

Options
  Rotate

    There, you can set the application angle of filter (0-360 counter-clockwise). 0 is default setting: The curve will be applied from the upper border and/or from the lower. Set to 90, it will be applied from left border and/or from the right one.

  Smoothing, Antialiasing

    The distort process may create hard and stepped borders. These two options improve this aspect.

  Work on copy

    This option creates a new layer called “Curve_bend_dummy_layer_b” which becomes the active layer, allowing you to see changes to your image in normal size without modifying the original image until you press the OK button.

Modify Curves

  In this grid, you have a marked horizontal line, with a node at both ends, which represents by default the upper border of image. If you click on this curve, a new node appears, that you can drag to modify the curve as you want. You can create several nodes on the curve.

  You can have only two curves on the grid, one for the so named “upper” border and the other for the so named “lower” border. You can activate one of them by checking the Upper or Lower radio button.

  If you use the Freehand Curve Type option, the curve you draw will replace the active curve.

Curve for Border

  There you can select whether the active curve must be applied to the Upper or the Lower border, according to the rotation.

  | 小心
  Remember that the curve border depends on the rotation. For example, with Rotate = 90° the upper curve will actually be applied to the left border.

Curve Type

  With the Smooth option, you get automatically a well rounded curve when you drag a node.

  The Freehand option allows you to draw a curve freely. It will replace the active curve.

Buttons
  Copy

    Copy the active curve to the other border.

  Mirror

    Mirror the active curve to the other border.

  Swap

    Swap the Upper and Lower curves.

  Reset

    Reset the active curve.

  Open

    Load the curve from a file.

  Save

    Save the curve to a file.

5.18. Blinds |  | 5.20. Page Curl

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