Bring in the Clouds!
Bringing in new clouds to an image can be both fun and tricky. It’s cool to see the immediate effect it has on your image, but it’s tricky in the sense that you have to pick the right clouds to use. Generally, you want replacement clouds that are close to the focal length of the original image. The horizon line in both should be similar. The lighting/time of day should also be similar, or at least not make it obvious that they are different.
As an example, pretend you have shot something with strong, overhead light at high noon. If you try to replace the clouds in that scene with clouds shot at sunset on an overcast day, chances are that it won’t work, because the light shown in the cloud area (soft, warm, directional from ...
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