4. Transform Tools

4. Transform Tools
	Chapter 13. Toolbox

4.1. Common Features

Figure 13.43. An overview of the transform tools

Inside the Transformation tool dialog, you will find seven tools to modify the presentation of the image or the presentation of an element of the image, selection, layer or path. Each transform tool has an Option dialog and an Information dialog to set parameters.

4.1.1. Tool Options

Figure 13.44. Common options of transform tools

Some options are shared by several transform tools. We will describe them here. More specific options will be described with their tool.

Affect

GIMP offers you three buttons which let you select which image element the transform tool will work on.

	Warning
	Remind that tha Affect option persists when you quit the tool.

When you ativate the first button The tool works on the active layer. If no selection exists in this layer, the whole layer will be transformed.

When you activate the second button the tool works on the selection only (the whole layer if no selection).

When you activate the third button, The tool works on the path only.

Transform Direction

See Section 4.4, “Rotate Tool”.

Interpolation

The Interpolation drop-down list lets you 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

After transformation, the image can be bigger. This option will clip the transformated image to the original image size.

Preview

GIMP lets you select among four Preview possibilities :

Outline: Puts a frame to mark the image outline, with a handle on each corner. Movements will affect this frame only on the Preview, but the result of the transformation will concern either the content or the boundaries of the selection according to the selected Affect mode.
Grid: Puts a grid on the image, with four handles. Movements will affect this grid only on the Preview, but the result of the transformation will concern either the content or the boundaries of the selection according to the selected Affect mode.
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.
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.