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### 7.2. Stack

The Stack submenu

The Stack submenu contains operations that either select a new layer as the active layer (top four items), or change the position of the active layer in the layer list (as shown in the Layers dialog).

#### Select Previous Layer

This command can be accessed from an image menubar as Layers->Stack->Select Previous Layer, or by using the keyboard shortcut Page_Up or the Up arrow-key, or more simply by clicking on layer name in Layer Dialog.

"Select Previous Layer" causes the next layer down in the layer list to become the active layer for the image, as highlighted in the Layers dialog. If the active layer is at the bottom of the list, this menu entry will be insensitive. Note that on a standard Windows-style English keyboard, the default shortcut Page_Up refers not to the keys on the number pad, but to the other "Page_Up" key in a group of six keys to the left of the numberpad.

| Tip
The keyboard shortcuts for "Select Previous Layer" and "Select Next Layer" may be very useful if you find yourself often picking colors from one layer to use for painting on another layer, especially in conjunction with the feature that makes most paint tools switch to color-picking mode if the Ctrl key is held down.

#### Select Next Layer

This command can be accessed from an image menubar as Layers->Stack->Select Next Layer, or by using the keyboard shortcut Page_Down or the Down arrow-key, or more simply by clicking on layer name in Layer Dialog.

"Select Next Layer" causes the next layer up in the layer list to become the active layer for the image, as highlighted in the Layers dialog. If the active layer is at the top of the list, this menu entry will be insensitive. Note that on a standard Windows-style English keyboard, the default shortcut Page_Down refers not to the keys on the number pad, but to the other "Page_Down" key in a group of six keys to the left of the numberpad.

#### Select Top Layer

This command can be accessed from an image menubar as Layers->Stack->Select Top Layer, or by using the keyboard shortcut Home or more simply by clicking on layer name in Layer Dialog.

"Select Top Layer" causes the top layer in the layer list to become the active layer for the image, as highlighted in the Layers dialog. If the active layer is at the top of the list, this menu entry will be insensitive. Note that on a standard Windows-style English keyboard, the default shortcut Home refers not to the keys on the number pad, but to the other "Home" key in a group of six keys to the left of the numberpad.

#### Select Bottom Layer

This command can be accessed from an image menubar as Layers->Stack->Select Bottom Layer, or by using the keyboard shortcut End or more simply by clicking on layer name in Layer Dialog.

"Select Bottom Layer" causes the bottom layer in the layer list to become the active layer for the image, as highlighted in the Layers dialog. If the active layer is at the bottom of the list, this menu entry will be insensitive. Note that on a standard Windows-style English keyboard, the default shortcut End refers not to the keys on the number pad, but to the other "End" key in a group of six keys to the left of the numberpad.

#### Raise Layer

This command can be accessed from an image menubar as Layers->Stack->Raise Layer or by using the keyboard shortcut Shift-Page_Up

"Raise layer" raises the active layer one level higher in the layer list. If it is already at the top, or there is only one layer, the menu entry will be insensitive. If the active layer is at the bottom and lacks an alpha channel, it cannot be raised until an alpha channel is added to it.

#### Lower layer

This command can be accessed from an image menubar as Layers->Stack->Lower Layer or by using the keyboard shortcut Shift-Page_Down.

This item lowers the active layer one level in the layer list. If it is already at the bottom, or there is only one layer, the menu entry will be insensitive.

#### Raise Layer to top

This command can be accessed from an image menubar as Layers->Stack->Raise to Top or by using the keyboard shortcut Shift-Home.

This item raises the active layer to the top of the layer list. If it is already at the top, or there is only one layer, the menu entry will be insensitive. If the active layer is at the bottom and lacks an alpha channel, it cannot be raised until an alpha channel is added to it.

#### Layer to bottom

This command can be accessed from an image menubar as Layers->Stack->Layer to Bottom or by using the keyboard shortcut Shift-End.

This item lowers the active layer to the bottom of the layer list. If it is already at the bottom, or there is only one layer, the menu entry will be insensitive.

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