7.53. レイヤーサイズの変更...

7.53. レイヤーサイズの変更...
	7. 「レイヤー」メニュー

In GIMP, each layer has its own size that can be changed independently of the size of the image. This command changes the dimensions of a layer, but it does not scale its contents.

	注記
	By default, painting outside the borders of a layer is ignored. You can, however, enable the Expand Layers setting in the Paint Tool Options, which will automatically extend the size of the layer when painting near one of its borders up to the size of the canvas.

7.53.1. コマンドの呼び出し方

You can access this command

From the main menu through Layer → Layer Boundary Size….
From the Layers Dialog, you can access it through the Layer Boundary Size… command of its context menu.

7.53.2. 「レイヤーサイズの変更」ダイアログのご説明

図16.112 「レイヤーサイズの変更」ダイアログ

Template

This drop-down list allows you to pick a size from one of the available image templates. For more information on templates see Create a New Image or the Templates Dialog.

When choosing a template that has a different print resolution (ppi) than your image, two new buttons will appear that ask you how to adjust this.

Scale template to … ppi will adjust the template to the ppi of the image; and Scale image to … ppi will adjust the image to the ppi of the template.

レイヤーサイズ

Width, Height: ダイアログが開いた直後はこれらの欄に活性レイヤーの元の寸法が示されます。いずれの値も数値記入欄で変更できます。両欄を結ぶ右側の鎖のしるしが繋がった姿のときはどちらかの値を変更すると縦横比を保つようにもう一方の値が自動的に変更されます。このしるしをクリックすると鎖は解かれ、幅と高さを個別に指定できるようになります。
Unit of Measurement: 既定の単位はピクセルですが、引き出しメニューで他の単位に切り替えられます。たとえば元の大きさの百分率をパーセントを使って指定できます。

X Offset, Y Offset

These coordinates are relative to the layer, not to the image. They are used to move a frame that determines which part of the layer content will be selected for the resized layer. In our example, the layer and the content have the same dimensions, and, of course, you have no frame to move. If you reduce Width and Height , the frame of the resized layer appears in the preview.

A Preview of the layer inside the frame of the canvas

Besides the layer dimensions, a preview represents the layer with the frame of the resized layer. You can move this frame using the X and Y offsets and also dragging the cross-shaped cursor that appears when the mouse pointer moves over the layer area.

Center

The Center button allows you to place the frame at the center of the layer.

Fill With

This allows you to select how to fill the background of the layer when you increase its size. The same options are available here as in the Create New Image Dialog.

7.53.3. Resizing Layer

Increasing the size of a layer

You can't make the size of a layer larger than the image canvas.

If the layer is smaller than the image, you can enlarge the Width and/or Height. If you want to enlarge the layer to the size of the image, it is easier to use Layers to Image Size.

Reducing the size of a layer

If you want to remove unused parts of a layer, you can reduce the size.

図16.113 使用例