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Defining Layer Designations and Attributes
Not only does Photoshop give you the ability to generate layers, it gives you the ability to generate layers with different designations. The designation of a layer determines the type of information the layer contains. For example, type layers hold editable text, and a mask layer holds image masks. The ability to control the designation of a layer helps to organize the different elements that typically make up a Photoshop image.Background. The Background is a unique type of layer element (technically, it's not called the Background layer; just the Background). Backgrounds are always positioned at the bottom of the layer stack and they cannot be moved. In addition, the Background does not support transparency.Layer.
Clicking the Create New Layer button creates Photoshop layers. New layers are always inserted directly above the active layer. Traditional layers support all of Photoshop's drawing and shape tools, opacity and fill and blending mode options, but do not support type. Traditional layers can be moved up and down in the layer stack by dragging.Type.
To create a Type layer, select one of Photoshop's Type tools, click in the active document and begin typing. Photoshop automatically creates the Type layer directly above the active layer in the Layers palette.Mask.
Masks are applied to a layer by clicking the Add Layer Mask button on the Layers palette. Masks serve a function; they create transparent areas in the visible image. Use masks to remove elements of an image without physically erasing them.Shape.
Shape layers control vector data by the use of a vector mask. You can create a shape layer in one of several ways: Select the Pen tool from the toolbox, click the Shape Layer button (located on the Options bar, and then begin drawing, or select any of Photoshop's shape tools using the Shape layer option.Adjustment.
Adjustment layers let you control everything from contrast to color. To create an Adjustment layer, click the Create New Fill Or Adjustment Layer button, and then select from the available options. The adjustment layer is placed directly above the active layer, and controls the information in all the underlying layers.
