Tutorial: How to change / set the opacity of a lightroom preset

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First make a copy of the original image. Right click on image + create virtual copies. After applying your desirable lightroom preset to the image copy.
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Right click and select Edit In, then select Open as layers in Photoshop.Command or control select both images ( original and the copy ).

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Your both images will appear like this in Photoshop. The original photo will be over the copy. Select the layer of the original image and move below the copy image ( with the preset effect)
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With the copy image ( with the preset effect ) selected change the opacity to your favorable percentage. In my example I changed the opacity to 70% which game me exactly the effect I needed.

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At the end make sure you change the option of saving as Photoshop file. Save your work to your desirable format, I usually use PNG. I hope this tutorial was helpful.