The layer box is the instrument you will use most to work with layers. It gives an overview of the layers that are present in your image, and using it you can manage layers by adding, removing, reordering or modifying them.
The layer box consists of three parts. The middle part gives an overview of the layers in the image. At the top, you can set some properties for the current layer. At the bottom, a couple of layer management options can be found. The next sections describe these three parts in more detail.
This part shows you which layers are present in your image. In a tree-like structure, the layer group hierarchy is shown: layers that are contained within a layer group are displayed a bit to the right to indicate their belonging to that group.
For each layer, a thumbnail preview and its name are shown. The layer name is preceded by a folder icon if it is a group layer. Furthermore, two indicators are present: the eye icon shows whether the layer is currently visible (an open eye indicates that the layer is visible, a closed eye indicates that it is not), and the lock icon shows whether the layer is locked. No changes can be made to a locked layer.
When you click on a layer's eye icon, its visibility is switched from on to off or vice versa. Clicking on the lock icon enables or disables editing of that layer. You can click on the name of the current layer to rename it. Note that to rename a layer, it has to be the current one. You do not need to activate a layer in order to make it (in)visible or (un)locked via the eye and lock icons, respectively: these work directly.
Doubleclick on a layer entry in the list to open the Layer Properties dialog. This dialog shows a layer's colorspace and profile. You can also change its name, opacity and composite mode here.
The top of the layer box contains two controls for setting properties of the currently selected layer. The list box at the left allows you to quickly set the layer's composite mode. The spin field and slider at the right can be used to change the layer's opacity.
At the bottom of the layer box, there are five buttons. From left to right, these are as follows. The icon brings up a submenu from which you can choose which type of layer you want to add. This menu can also be opened by clicking with the mouse button on the layer box. The and buttons move the current layer one level down and up, respectively, within the current layer group. If the layer is already the last or first within the layer group, trying to move it further will move it out of the layer group. The button opens the Layer Properties dialog, just as when you would have doubleclicked on the layer. The button deletes the current layer.
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