Diffuse lightexample

Lighting is a huge component of how a shot looks and feels to a viewer’s eye. Specifically, the quality of light can deeply affect the overall tone of a shot. Diffused light, hard light and everything in between are tools filmmakers have at their disposal to tell a story through their shots. In this article, we’re going to dive into how diffused light photography is created with a light diffuser. What is a light diffuser and how does it work? Let’s dive in.

As we discussed in the previous section, hard light can create a certain tone and mood to a shot. It’s important to understand all qualities of light to fill out your tool kit as a filmmaker and hard light is a valuable lighting tool. Learn more about hard light in our next article.

The more material or particles that a light source’s photons interact with before reaching a subject, the wider the spread of photons and light is on a subject. This is known as diffused light. Diffused light is used for soft lighting and less harsh shadows. It is often more flattering on a subject. To visually understand diffusion and how it is created, check out this video by DSLR Video Shooter.

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To understand what a light diffuser is, it’s important to understand how light travels. As light travels from its source through the air, it interacts with any particle on its path. As the light photons interact with more and more material, its path is changed.

Diffuse lightvs directlight

Direct light is achieved by having no material or obstructions between a light source and a subject. Photons from the source land directly onto a subject without being redirected or cut. Direct light results in hard lighting, sharper shadows, and more contrast.

Light diffusers can be large sheets of diffusion placed at a distance from a light or it can be a single sheet of diffusion placed on the barn doors of a light. There are various ways to introduce a diffuser into your lighting setup and it will all depend on the overall lighting scheme you are trying to create.

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A light diffuser can be created in various ways, but understanding what it does in the most fundamental way will help you understand how you can achieve diffused light through whatever means you have.

Diffuse lightin computer graphics

Asking these types of questions will help you decide if a diffuser is necessary or not. Whether the current project you are working on can benefit from using a diffuser or not, it’s incredibly valuable to understand and know how and when to use one in case a project requires it.

The end result of the macro is seen in the main() function: The repeat() “function” processes a series of statements a given number of times. This kind of trick wouldn’t work with a true function; only a macro can set up such a statement within your code.

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My advice is to use #define to create constants, which is common and expected. When you use #define to shorten tangled code, that might be another good use, but my advice is to pull back on creating new function-like macros and otherwise obfuscating the text. While such antics may impress hard core C programmers, the end result is difficult to document and debug.

A few Lessons back, someone asked me to describe how a loop works. I committed the terrible sin of actually explaining how a for loop did its job. They just wanted to know, “Okay, so I need to repeat a chunk of code ten times.” That’s the kind of statement you get from a student who is required to take a programming course but doesn’t give a damn about learning anything.

Diffuse lightCeiling

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Kyle DeGuzman graduated from San Diego State University with a Bachelor of Science in Television, Film, & New Media. He currently resides in Denver, Colorado spending his time writing, filmmaking, and traveling.

Some C coders really go nuts with macros. I’m not a big fan of those people. The C language is obscure enough. When you add to that obscurity the use of macros, it makes a difficult language even more incomprehensible. Yet, some coders revel in that obfuscation.

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Now that we’ve covered how a light diffuser works, let’s dive a bit about when to use one. The best way to understand the value of diffused light is to compare it with the opposite end of the spectrum — direct light.

Anyway, the C language lacks a direct looping keyword, but you can define one as a macro, which I did in this code example:

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The #define preprocessor directive at Line 3 sets the repeat() macro equal to a standard for loop. Variable c from the repeat macro is placed into the for loop at the proper locations to make a simple loop. Another variable, integer c1, is created inside the for statement with int c1=0. That’s perfectly legal, providing that the variable isn’t declared elsewhere in the code.

Circling back to the question — when should a diffuser be used? It ultimately comes down to the lighting style you are trying to create. What story are you telling? What do you want the viewer to feel when they see this shot?

To create diffused light, cinematographers and gaffers often use a light diffuser. To put it simply, a light diffuser is a semi-transmittant piece of material placed in between a light source and a subject to diffuse the light as it passes through the material. This material does not solely block or cut light, but redirects light as it passes through for a diffused light spread on a subject.

Diffused light photography on the other hand results in a wider spread beam angle. Images that utilize a diffuser typically have softer shadows and more even lighting.

It's important to note that diffusers also result in a loss of output of light. So typically when creating diffused light with a diffuser, it's best to opt for a stronger light source.

Diffusedlightphotography

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Above, the repeat macro is expanded into two statements. The first declares the int variable c1. The second is the for loop that uses variable c1 as well as variable c. The program output is the same. My point is to demonstrate that a #define macro can include more than a single statement. And that’s where things can get even more confusing.

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By using a light diffuser, a light source will be redirected into a wider, more even spread resulting in less contrast, softer shadows, and overall more flattering lighting style for a subject.

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As you can see from the image examples above, the mood and tone of direct and diffused light are very different. Hard light gives off a more dramatic, edgy tone while diffused light is flattering and overall a bit more vibrant.