Numerous tutorials on the Internet describe various ways to age a photo. I would like to offer another one, using Photoshop with Filter Forge plugin. This tutorial doesn't use ready-made textures and brushes.
If you haven't got Filter Forge installed, download it from the developer's website http://www.filterforge.com/download/. Run the setup to install Filter Forge. A new menu option appears in the Filters menu.
Run Photoshop and open the source image (Ctrl+O). I used a photo that I shot in St. Petersburg using Canon A520. Note there are no details that would go against the vintage photo style, like satellite dishes or modern cars. Examine your photo for such elements and remove them from the image. There are many ways to do this, I will not address this further.
Correct the image contrast: Image > Adjustment > Brightness/Contrast. For this image I set the contrast to +30.
Select the Filter Forge plugin from within Photoshop (Filter > Filter Forge). Visit the 'Old Photo' page – http://www.filterforge.com/filters/5075.html – and click 'Open in Filter Forge'. The filter (38,7 KB) will be downloaded and opened.
Repeat the above actions to download the 'Coffee Stain' filter from http://www.filterforge.com/filters/1203.html (12,9 KB). We'll use it later to add stains.
In Filter Forge, select 'Old Photo' from the Photo category.
Now we've got the necessary filter and can figure out the parameters required for the modification. For the start let's try the factory presets (on the Presets tab) – double-click a preset thumbnail. One of them is acceptable but can be fine-tuned. Click the Settings tab and start experimenting with the sliders.
One thing can be of great help: the 'Next variant' button in the Randomizer section. You can simply click it until you get acceptable results.
Here's the variant with which we'll proceed:
Create a new layer in Photoshop, name it Stain and start Filter Forge (Filter > Filter Forge). Select the 'Coffee Stain' texture filter in the Misc category.
Sidenote: you may have spotted duplicate categories in Filter Forge categories list, such as Misc, Frame, Patterns. One of them contains texture filters (the top part of the list), the other one contains effects (the bottom of the list). For more info, visit http://www.filterforge.com/more/help/Miscellaneous/FilterClasses.html. The 'Coffee Stain' texture filter is located in the first Misc category.
Apply the filter to the newly-created layer.
Repeat the above actions to create new layers with more stains. Don't forget to experiment with the filter settings.
Move the stain layers to adequate positions (using the Move Tool ). Set the Blending mode and Opacity for each layer. Remove the unnecessary stain parts (using the Erase Tool ).
That’s all. Here is the result:
Filter Forge's amazing node based editor has been invaluable in giving us the power to create textures that make the most of today's real-time pixel shaders.
Visual Effects Lead Artist
“Chief among my pleasures is Filter Forge, which I've been ranting (positively) and raving (voraciously) about ever since it entered my life.”
Resident Enlightenment Manager Linden Lab, makers of virtual world Second Life
“For 3D modelers, Filter Forge is a dream come true. It creates seamless textures with a single mouse click. The professional version creates the following map types for any texture: bump, normal, specular strength, specular exponent, diffuse, metallic, and alpha. The same filter can be used to generate any resolution, since filters are procedural.”