Step 1: First in PS, open the portrait material, click the hide icon, first hide the background layer, subtract the clouds from the sky, enter the "Channel" panel, you can see the "red" channel The color of the middle cloud is the most different from the background color. Right-click the "red" channel and select the "Copy Channel" command in the pop-up shortcut menu. At this time, a new "Red Copy" channel will appear. In order to select For the selection of the cloud part, you need to increase the gap between the clouds and the background color in the channel. Press the Ctrl M key combination, select the black eyedropper, and absorb the background color multiple times in the view to make the background color black. As shown in the picture below:
Step 2: There is a big color difference between the main body of the material picture and the background, so it is very fast to use channel cutout. The method provided by the author is also very good. The process: first simply correct the color of the picture, then calculate the required gray channel, and then use color adjustment and eraser to remove the background. Use the "Reduce" tool, set the "Range" to "Highlight" in its options bar, and the "Exposure" to 50. Use the Dodge Brush Tool to draw and smear on the clouds to lighten the clouds, and then hold down Ctrl key, click the "Red Copy" channel, and a selection of clouds will appear. As shown in the picture below:
Step 3: Return to the "Layer" panel, add a layer mask for the sky layer, then click to open the background image of the "Hide" icon, hold down Ctrl T Use the key combination to adjust the size and position of the clouds, and use a black brush to paint the clouds to cover the portrait, as shown in the picture below:
Final effect: