Adobe Photoshop CC 2014 v.14.xx - Manual (Page 314)

Vertical Centers
Bottom Edges
Left Edges
Horizontal Centers
Right Edges
To the top
Note:
Auto
Perspective
Spaces the layers evenly, starting from the vertical center pixel of each layer.
Spaces the layers evenly, starting from the bottom pixel of each layer.
Spaces the layers evenly, starting from the left pixel of each layer.
Spaces the layers evenly, starting from the horizontal center of each layer.
Spaces the layers evenly, starting from the right pixel on each layer.
Automatically align image layers
The Auto-Align Layers command can automatically align layers based on similar content in different layers, such as corners and edges. You
assign one layer as a reference layer, or let Photoshop automatically choose the reference layer. Other layers are aligned to the reference layer
so that matching content overlays itself.
Using the Auto-Align Layers command, you can combine images in several ways:
Replace or delete parts of images that have the same background. After aligning the images, use masking or blending effects to combine
parts of each image into one image.
Stitch images together that share overlapping content.
For video frames shot against a static background, you can convert frames into layers, then add or delete content across multiple frames.
1. Copy or place the images you want to align into the same document.
Each image will be in a separate layer. See Duplicate layers.
You can load multiple images into layers using a script. Choose File > Scripts > Load Files into Stack.
2. (Optional) In the Layers panel, create a reference layer by locking it. See Lock layers. If you do not set a reference layer, Photoshop will
analyze all the layers and select the one at the center of the final composition as the reference.
3. Select the remaining layers you want to align.
To select multiple adjacent layers from the panel, Shift-click; To select noncontiguous layers, Ctrl-Click (Windows) or Command-click
(Mac OS).
Do not select adjustment layers, vector layers, or Smart Objects which do not contain information needed for alignment.
4. Choose Edit > Auto-Align Layers, and choose an alignment option. For stitching together multiple images that share overlapping areas—for
example, to create a panorama—use the Auto, Perspective, or Cylindrical options. To align scanned images with offset content, use the
Reposition Only option.
Photoshop analyzes the source images and applies either a Perspective or Cylindrical layout, depending on which produces a better
composite.
Creates a consistent composition by designating one of the source images (by default, the middle image) as the reference
image. The other images are then transformed (repositioned, stretched, or skewed, as necessary) so that overlapping content across layers
is matched.
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