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Adobe Photoshop CS : Simulate film grain in a digital image

This Photoshop tutorial covers the details of Simulate film grain in a digital image in Photoshop.

Harvest the grain
In this article, we'll show you how to apply grain to your digital images using Photoshop and Photoshop Elements. First, we'll discuss how grain develops in film and how to use that information to make the right choices when working in the application. Next, we'll step through the three options you have for adding grain, including the Film Grain filter, the Texture Grain filter, and the Noise filter. We'll tell you what each one does and which one we think works the best.
The photographic nature of grain
When a photographer shooting with film wanted to get a "grainy" image, she would use fast ISO settings (ISO 800 and above) or uprate her film when shooting. Uprating involves shooting at a higher ISO speed than the film is designed for, which initially underexposes the film, and then pushing (overexposing) the negatives during the printing process. The effect is increased grain size and contrast, similar to the effect higher ISO settings have on digital cameras. Instead of film grain, the pixels become more evident in the form of noise. Just as digital noise degrades your image quality, grain can overwhelm an image (if not approached thoughtfully) whether you're adding it photographically or digitally.
Add grain with Photoshop
Photoshop has three different grain filters, so we will tell you how each one works and how you can control them to get the grainy images you want. You'll be able to best see the subtle differences between the three options shown in this article on your computer screen. We've chosen to use grayscale images for our example, but film grain works just as well with full color images. If you want to follow along using an image, make sure you use one that is in RGB or Grayscale mode, as the filters we'll be using don't work in CMYK or LAB mode.
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Read this full PhotoShop Tutorial of Adobe Photoshop CS : Simulate film grain in a digital image.


Resource: http://www.adobe.com/designcenter/photoshop/articles/phs8kbfilmgrain/phs8kbfilmgrain.pdf
Posted By : Nathania
On date : 10.09.09

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