First, open the image you want to apply a texture effect to, then open an image that has the texture you want to use (I generally use very inexpensive stock photography images of things like crumpled paper, old parchment, cracked concrete—you’ll find a ton of them for sale cheap. I bought most of mine for $1 each. You can also use free images that you’ll find online by searching for “creative commons license + paper textures”). Once you’ve found one you like, press Command-A (PC: Ctrl-A) to select the entire image, then copy-and-paste your texture image into the document with your original image (your texture image will appear on a layer directly above it). The final step to get this texture to blend perfectly with your image is to try out different layer blend modes and see which one looks best. The trick is to press Shift-+ (plus sign) over and over again, and each time you do, it tries out another blend mode. In just a few seconds, you’ll usually find a perfect match (my guess is it will be either Multiply [as seen above], Soft Light, or Overlay, but of course, not always—it just depends on the image). If you find a blend mode that looks good, but the texture is too intense, just lower the Opacity of that layer (near the top right of the Layers panel) until it looks right to you.
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