Figure 13.115. 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.

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

4.8.2. Options

Figure 13.116. “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 Windows → Dockable Windows → Tool Options which opens the option window of the selected tool.

Transform; Interpolation; Direction; Clipping; Preview

	Note
	These options are described in Transform tools common options.

4.8.3.  The Information window for perspective transformation

Figure 13.117.  The dialog window of the “Perspective” tool

Matrix

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