How does ps adjust the vertical version of the background picture to the horizontal version without deformation?

Ps adjusts the vertical image to a horizontal image without distortion. There are three ways:

1, using the cropping tool, according to the aspect ratio of the horizontal version, the disadvantage of this method is that most pictures are lost.

2. Put the vertical photos in the horizontal background image. This method keeps the original picture, but the original picture is greatly reduced.

3. For images with special pictures, it is the most perfect method to repair according to the proportion of horizontal version, but it is technically difficult.

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