Use the Auto-Blend Layers command to stitch or combine images with smooth transitions in the final composite image. Auto-Blend Layers applies layer masks as needed to each layer to mask out over or underexposed areas or content differences. Auto-Blend layers is available only for RGB or Grayscale images. It does not work with Smart Objects, video layers, 3D layers, or background layers.
Among the many uses of the Auto-Blend Layers command, you can blend multiple images of a scene with different areas in focus to achieve a composite image with an extended depth of field. Similarly, you can create a composite by blending multiple images of a scene with different illuminations. In addition to combining images of a scene, you can stitch together images into a panorama. (Although, it might be better to use the Photomerge command to produce panoramas from multiple images.)
Auto-Blend Layers applies layer masks as needed to each layer to mask out over or underexposed areas or content differences and create a seamless composite.
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Each image will be in a separate layer. See Duplicate layers.
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You can align layers manually or by using the Auto-Align Layers command. See Automatically align image layers.
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Stack Images
Blends the best details in each corresponding area. This options works best with aligned layers.
Note:
Stack Images lets you blend multiple images of a scene with different areas in focus or different illuminations, to achieve the best results of all the images (you must auto-align the images first).