4.8. 透视

图 13.120. Perspective tool

Perspective tool

The Perspective Tool is used to change the perspective of the active layer content, of a selection content or of a path. When you click on the image, according to the Preview type you have selected, a rectangular frame or a grid pops up around the selection (or around the whole layer if there is no selection), with a handle on each of the four corners. By moving these handles by click-and-drag, you can modify the perspective. At the same time, a Transformation information pops up, which lets you valid the transformation. At the center of the element, a circle lets you move the element by click-and-drag.

[注意] 注意

This tool is not actually a perspective tool, as it doesn't impose perspective rules. It is better described as a distort tool.

4.8.1. Activating the Tool

You can access to the Perspective tool in different ways:

  • From the image menu bar Tools/ Transform Tools Perspective,

  • By clicking the tool icon: in Toolbox,

  • By using the Shift+P key combination.

4.8.2. 选项

图 13.121. Perspective tool options

“Perspective” tool options

Normally, tool options are displayed in a window attached under the Toolbox as soon as you activate a tool. If they are not, you can access them from the image menu bar through WindowsDockable WindowsTool Options which opens the option window of the selected tool.

Transform; Interpolation; Direction; Clipping; Preview
[注意] 注意

These options are described in Transform tools common options.

4.8.3.  The Information window for perspective transformation

图 13.122.  The dialog window of the Perspective tool

The dialog window of the “Perspective” tool

矩阵

You can get a small knowledge about matrices in the 第 8.2 节 “Convolution Matrix”.