How To combine multiple shots into a seamless whole
Final Step: Flatten Image and Make Final Fixes
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Study the image for areas that reveal the compositing, and burn in (O) appropriate edges to hide telltale edges. When you’re satisfied, flatten the image to a single layer, and apply a Noise filter to unify the visual texture of the separate images. Make final tweaks to overall exposure, color balance, and sharpness. For a scene like this, you will probably discover that the darker the image is, the simpler it is to make it appear real.