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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.
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.
(Optional) In the Layers palette, 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.
Select the remaining layers you want to align.
To select multiple adjacent layers from the palette, Shift-click; To select noncontiguous layers, Ctrl-Click (Windows) or Option-click (Mac OS).
Note: Do not select adjustment layers, vector layers, or Smart Objects which do not contain information needed for alignment.
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.
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