I. Understanding the Basics
* What are Colored Gels? Colored gels (or filters) are translucent sheets of colored plastic that you place in front of a light source to change the color of the light it emits. They come in a wide range of colors and densities.
* Why Use Colored Gels?
* Drama and Mood: Gels can dramatically alter the mood of a photo, creating feelings of warmth, coolness, mystery, or excitement.
* Visual Interest: They add visual interest and can make your portraits stand out.
* Creative Expression: They allow you to experiment and push the boundaries of traditional portraiture.
* Correcting Color Balance: Gels like CTO (Color Temperature Orange) or CTB (Color Temperature Blue) can be used to match the color temperature of different light sources, preventing color casts.
* Adding Accents: Using gels on specific areas of the subject or background can create interesting highlights and shadows.
* Types of Colored Gels:
* Corrective Gels: Used to adjust the color temperature of light (e.g., CTO, CTB).
* Color Effects Gels: Used to add color for artistic effect (e.g., red, blue, green, magenta, yellow).
* Neutral Density (ND) Gels: Reduce the intensity of light without changing its color. Less common for portraits, but useful in specific situations.
* Diffusion Gels: Soften the light (less common, but can create interesting effects).
* Gel Density (Transmission): This refers to how much light the gel allows to pass through. A denser gel will block more light. They are usually specified in stops.
II. Essential Equipment
* Light Source: Speedlights (flashes), strobes, or even continuous lights (LED panels) can be used with gels. Flashes generally provide more power and control.
* Colored Gels: Purchase a gel set that offers a variety of colors. Rosco and Lee Filters are reputable brands. You can buy individual sheets or pre-cut kits.
* Gel Holders/Mounts: You'll need a way to attach the gels to your lights. Common options include:
* Speedlight Gel Holders: Designed to fit over the head of a speedlight (often use velcro)
* Strobe Gel Holders: May attach with clips, magnets, or be part of the light modifier.
* Gaffer Tape: Can be used as a temporary solution but can be messy.
* Light Stands: To position your lights.
* Light Modifiers (Optional): Softboxes, umbrellas, reflectors, grids, snoots. These tools help shape and control the light *before* it passes through the gel.
* Light Meter (Optional): Helps you accurately measure light output. Helpful when trying to balance different colored lights.
III. Basic Lighting Setups with Gels
Here are a few basic setups to get you started:
1. Single Light with Gel:
* Setup: Place one light with a gel aimed at your subject.
* Effect: Creates a simple, monochromatic portrait with a color cast.
* Use: Great for experimenting with different colors and seeing how they affect the mood.
2. Two Lights: One Colored, One White (Key/Fill):
* Setup: Use one light as your key light (main light) with a gel. Use a second light as a fill light (smaller power and no gel, or a very subtle gel) to soften shadows and brighten the overall image.
* Effect: Adds a pop of color while maintaining some natural skin tones.
* Use: A good starting point. The white light helps keep the portrait from becoming too extreme.
3. Two Lights: Backlight/Rim Light with Gel:
* Setup: Place one light behind the subject with a gel to create a colored rim light. Use a second light (without a gel, or with a subtle gel) as your main light source from the front.
* Effect: Separates the subject from the background and adds a colorful halo.
* Use: Effective for creating dramatic and stylized portraits.
4. Background Light with Gel:
* Setup: Place a light with a gel pointed at the background. Use a separate light (without a gel) to illuminate the subject.
* Effect: Creates a colored background while keeping the subject's skin tones relatively natural.
* Use: Great for adding depth and visual interest without directly affecting the subject's skin.
5. Two Lights: Complementary Colors:
* Setup: Use two lights with complementary colored gels (e.g., blue and orange, red and green). Position the lights on opposite sides of the subject.
* Effect: Creates a dynamic and visually striking portrait with contrasting colors.
* Use: More advanced. Requires careful balancing of light and color.
IV. Tips and Techniques
* Start Simple: Don't try to do too much at once. Begin with a single light and one gel and gradually add complexity.
* Color Theory: Understanding basic color theory (complementary colors, analogous colors, etc.) will help you create more visually appealing images.
* Complementary Colors: Colors opposite each other on the color wheel (e.g., red/green, blue/orange, yellow/purple). These create high contrast and visual excitement.
* Analogous Colors: Colors that are next to each other on the color wheel (e.g., blue, blue-green, green). These create a more harmonious and subtle effect.
* Triadic Colors: Three colors evenly spaced on the color wheel.
* Gel Placement:
* Distance Matters: The closer the gel is to the light source, the more concentrated the color will be. The further away, the more diffused.
* Angle Matters: Experiment with the angle of the light to see how the color falls on the subject.
* Light Ratios: Pay attention to the power of each light relative to the others. You might need to adjust the power of your lights to achieve the desired balance.
* White Balance:
* Custom White Balance: Shooting with a custom white balance can help you achieve more accurate colors. Take a photo of a gray card under your gelled light and set your white balance to that.
* Post-Processing: You can adjust white balance in post-processing (Lightroom, Photoshop), but it's best to get it as close as possible in camera.
* Modifier Combinations: Combine gels with light modifiers to control the shape and quality of the light. For example, use a gelled light inside a softbox for a softer, more diffused colored light. A grid can help concentrate the gelled light.
* Background Considerations: Think about the background color and how it will interact with the colored light. A white background will reflect the color of the gel, while a dark background will absorb it.
* Skin Tones: Be mindful of how the gels affect skin tones. Strong colors can create unnatural or unflattering results. You may need to use lighter densities of gels or use a second light to balance the color. Consider how the gel color interacts with the model's skin tone. Some gels will look better with lighter or darker skin.
* Post-Processing: Use post-processing software to fine-tune the colors, contrast, and sharpness of your images. You can also use adjustment layers to target specific areas of the image.
* Experimentation: The key to mastering colored gels is experimentation. Don't be afraid to try different combinations of colors, lighting setups, and post-processing techniques.
* Communication with your model: Explain what you're trying to achieve so they can understand the lighting and posing.
V. Specific Color Considerations
* Red: Passionate, energetic, dramatic. Can make skin appear flushed.
* Blue: Cool, calming, mysterious. Can make skin appear pale.
* Green: Natural, earthy, slightly unsettling. Can be tricky to use on skin.
* Yellow: Warm, happy, energetic. Can create a vintage feel.
* Magenta: Vibrant, playful, futuristic. Works well as a rim light.
* Orange: Warm, inviting, comforting. A popular choice for portraits.
* Teal: A stylish option for both portraits and backgrounds.
VI. Common Mistakes to Avoid
* Overdoing it: Using too many colors or too strong of colors can create a chaotic and distracting image.
* Ignoring skin tones: Ensure that the gels don't make the subject's skin look unnatural or unflattering.
* Poor light control: Not shaping or directing the light properly can lead to unwanted color spills and messy results.
* Forgetting to adjust white balance: Shooting with the wrong white balance can throw off the colors of your gels and make them look muddy.
* Not securing gels properly: Make sure the gels are securely attached to your lights to prevent them from falling off or melting (especially with high-powered lights).
VII. Safety Precautions
* Heat: Some gels can melt or burn if they get too hot. Use gels specifically designed for photographic lighting. Keep the gels away from the bulb and consider using LED lights, which generate less heat.
* Fire Hazard: Never leave lights unattended with gels attached.
* Secure Attachment: Ensure gels are securely attached to the lights to prevent them from falling and causing a hazard.
By following these guidelines and experimenting with different techniques, you can use colored gels to create truly unique and eye-catching portraits. Good luck and have fun!