Adobe 23101335 User Guide - Page 226

216 CHAPTER 8 Using Layers • Horizontal Centers to space the linked layers evenly starting from the horizontal centermost pixel on each layer. • Right Edges to space the linked layers evenly starting from the rightmost pixel on each layer. Note: Photoshop aligns and distributes only those layers whose pixels have greater than 50% opacity. For example, the Align Linked > Top Edges command aligns to the topmost pixel on the active layer that is more than 50% opaque. Editing layers A newly created layer is transparent. You can change the colors of pixels in a layer using the painting and editing tools, and then apply layer styles and filters to modify the layer's image data. All painting and editing occurs on the active layer (and in the active channel). Sampling from all layers By default, when working with the magic wand, smudge, blur, sharpen, clone stamp, or pattern stamp tool, you are applying color sampled only from pixels on the active layer. This means you can smudge or sample in a single layer even when other layers are visible, and you can sample from one layer and paint in another one. Alternatively, you can choose to paint using sampled data from all the visible layers. For example, you can use the clone stamp tool to clone an area containing pixels from all the visible layers and layer sets. To sample from all visible layers: 1 Click the magic wand tool ( ), smudge tool ( ), blur tool ( ), sharpen tool ( ), paint bucket tool ( ), or clone stamp tool ( ). 2 Select Use All Layers in the options bar. Note: When you are using tools that sample image data, painting or editing in a new layer where there are no pixels produces the best results when Use All Layers is selected. Filling a new layer with a neutral color Some filters (such as the Lighting Effects filter) cannot be applied to layers with no pixels. Selecting Fill with Neutral Color in the New Layer dialog box resolves this problem by first filling the layer with a preset, neutral color. If no effect is applied, filling with a neutral color has no effect on the remaining layers. The Fill with Neutral Color option is not available for layers that use the Normal, Dissolve, Hue, Saturation, Color, or Luminosity modes. (See "Adding layers" on page 210.) Note: Not all filters produce a visible effect when applied to a layer filled with a neutral color. Specifying opacity You can change the opacity of a layer or layers in a set using the Opacity option in the Layers palette. At 0% opacity, a layer is completely transparent; at 100% opacity, a layer is completely opaque. Note: You cannot change the opacity of a background layer or a locked layer.