When you've got very noisy footage, you may require very strong denoising. Grain fixes "plastic looking" footage which denoising can cause. Further, by manipulating how intense the grain is you can suggest different moods (gritty, beauty, etc) helping you to tell your story. The grain gives the image a physical texture that adds depth and helps images "pop" off the screen. Here's a shot I took with Kodak Portra 400 pushed just a little bit.
Why, when I've taken time to shoot video with as little noise as possible or gone and denoised all my footage, would I want to add grain back in? It's a good question, but there are a few great reasons that you should consider adding grain to all your projects.
It should be noted that digital video has image sensor noise which can look visually similar to grain (especially when tuned for it like in the Arri Alexa), but is the result of a very different process and tends to occur more in specific color channels instead of the more even wash that is common with organic film grain.
The way these granules clump (how close, how large, how many) give different film stocks and processing methods much of their unique look. After processing, the silver is removed and you're left with just the color dyes which have a tendency to clump - what we see as grain. When you expose a strip of film to light, what you're doing is causing a chemical reaction in very tiny (smaller than you can see) particles of metallic silver and their dye couplers. To put it simply, film grain is what makes photography possible. This is for those of you who have never heard the whir of a film camera or had the excitement tempered by trepidation that is looking through your rolls back fresh from the developer. Film Grainīefore we dig into the why and how, it's a good idea to step back for a minute and examine what exactly film grain is. Please note, this is not about adding film artifacts (scratches, leaks, dust, jumps, etc.) though many of these techniques apply just the same. Here I take the luxury of the article format to expand on concepts behind grain rather than the specific mechanics of how to achieve it. If you learn better from video, I highly recommend you check the link out as I walk you through the entire process of regraining. This article is a written companion to my YouTube tutorial "Adding Film Grain in DaVinci Resolve".
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