This tutorial will show you how to add noise to your photo in Photoshop
This tutorial assumes you already have your picture open in Photoshop
1) Go to Filter...
2) ...Noise...
3) ...and click Add Noise
4) Adjust the slider to set the amount of noise you want in your image
Now, we'll set the distribution. Gaussian gives more of a speckled effect while Uniform is more subtle
For this tutorial, we'll use Uniform
When Monochromatic is checked, the filter will apply the noise without changing the colors in the image
5) We will deselect monochromatic for this tutorial
6) Click OK when you are done
The noise filter has been applied to our photo
This is the end of the tutorial. You now know how to add noise to a photo in Photoshop