Task: To add one element from a different image. Take a conventional landscape view and render the sky so that it appears ideally exposed, with every detail of every cloud visible and textured.
- Find a scene with a clear and obvious horizon line and high dynamic range – i.e. a cloudy sky.
- Make 2 exposures – perfect exposure for the landscape and one perfect for the sky. The difference should be around 2 f/stops or more.
- Combine the 2 images.
- Copy the lighter image onto the darker image. Then erase the over-exposed sky from the upper layer to reveal the darker sky beneath.
- Flatten the image and save as a copy.
- Return to the original state of 2 layers before using the eraser brush.
- Now make a selection of the sky in the upper layer. refine the edges of the horizon. Save the selection.
- Now delete the upper layer’s sky, flatten and save as a copy.
Take the same image and use a sky from another. Consider the direction of sunlight, overall brightness and the contrast in order to make the match look good.