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Step 5: Add noise
To add noise, choose Filter> Noise> Add Noise. In the Add Noise filter, set the amount to 400% and click OK. If you are working with a black-and-white image, checkmark Monochromatic to make the noise black-and-white. Don't worry about the amount of noise added; we will adjust this setting later.
Note: If you are working on a Smart Object with Photoshop CS3, the filter you apply will be smart which means that you can edit the settings anytime you want.
Step 6: Blur the noise
We added some noise, but it looks like digital noise instead of film noise. Fixing this is easy: just blur the noise. Choose Filter> Blur> Gaussian Blur. Adjust the radius to get the noise result you like and click OK.
Step 7: Adjust the intensity of the noise
The grain should appear to be very strong; perhaps too strong for most situations. To reduce the visibility of the film grain, simply reduce the opacity of the Film Grain layer. If you are using Photoshop CS3, you can double click on the Gaussian Blur Smart Filter and edit the settings if it is not what you want.
Final Results
Original Image
Natural Film Grain Photoshop Tutorial
