Step 13Now we’re going to put a yellow filter effect over the whole thing. Go to Layer > New Adjustment Layer > Photo Filter. Select Yellow for the Filter and 90% for the Density.
Step 14 Select all layers and duplicate them, then merge all the duplicated layers into a single layer. You can also do this using a keyboard shortcut (Cmd/Ctrl + Alt + Shift + E). Next, go to Filter > Blur > Gaussian Blur. Move this layer so it will be beneath the Photo Filter layer, then change the blending mode to Screen with the Opacity set to 50%.