10.3. Curve Bend

Overview

This filter is found in Image>Filters/Distorts/Curve Bend

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

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 and 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" key.

Modify Curve

The Grid

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 Curve Type Free 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 Superior (or left) or the Inferior (or right) border, according to the rotation.

Curve Type

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

The Free 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 "superior" and "inferior" curves

Reset: Reset the active curve.

Open: Load the curve from a file.

Save: Save the curve to a file.

Example