The color difference between the selected image and the surrounding image is obvious (strong contrast), so a higher percentage value should be set;
On the contrary, the color difference between the selected image and the surrounding image is not significant (the contrast is small), so you should enter a lower edge contrast percentage value.
In this way, according to the different situations in the picture, you can choose to input a certain proportion, which allows you to better use the magnetic lasso tool to select the image you want.
There are blurred edges in the image, so you can enter a lower percentage.
(The percentage value of PS: 1- 100 can be filled in the "Contrast" option in the magnetic lasso tool.)
If my explanation can solve your problem, please adopt it! ~~~