How to get white clouds from blue sky and white clouds with ps

Cutout method: it is to cut off the part of white clouds. Channel digging is the main idea (please ask Baidu for specific ideas, because one or two words are not clear)

Synthesis method: without matting, directly drag the material into the picture to be processed, and use the idea of layer blending mode+mask+color matching to achieve the desired effect (you need to have some PS experience).

Material method: In fact, there are many PSD formats that can be used to mine white clouds, and there are also many forms of clouds. If there is no need to use a specific cloud form (Baidu: "Baiyun PSD"), then using the material will be more direct and efficient.

Drawing method: Use "Baiyun Brush" to directly draw the desired cloud shape (you need to download "Baiyun Brush" online).

I don't understand your intention to get white clouds. In fact, many times there are many ideas that can achieve the same effect. Maybe the effect you really want can be achieved without getting the white clouds in the material.