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Open Photoshop. Click File. Select Scripts. Click Load Files into Stack. Click Browse. Select your two images. Click Open. Click OK.
Double-click the Photoshop app icon, which resembles a blue "Ps" on a square background. It's in the top-left corner of the Photoshop window (Windows) or the screen (Mac). A drop-down menu will appear. This is near the bottom of the drop-down menu. Selecting it prompts a pop-out menu. It's near the bottom of the pop-out menu. A new window will pop up. You'll find this option on the right side of the window. Clicking it opens a window from which you can select the images you want to fade. Hold down either Ctrl (Windows) or Command (Mac) and click each of the two images you want to use. It's in the bottom-right corner of the window. You should see the photos' names appear in the middle of the window. It's in the top-right corner of the window. This will prompt Photoshop to open both images as distinct layers. Once Photoshop finishes opening the images, you can proceed with changing your image's opacity or adjusting the image's gradient.