1. Understanding the Basics:
* What are Gels? These are translucent colored sheets placed in front of your light source to alter the color of the light hitting your subject. They're made from durable heat-resistant materials (especially important for continuous lights).
* Why Use Them?
* Color Correction: Correcting white balance issues in mixed lighting environments. (e.g., using a CTO (color temperature orange) gel to balance flash with tungsten lighting).
* Creative Effects: Adding a mood, style, or visual interest to your portraits.
* Color Separation: Highlighting different parts of a scene with different colors.
* Adding Depth and Dimension: Creating shadows and highlights with distinct color tones.
* Types of Gels:
* Color Temperature Correction Gels: CTO (Color Temperature Orange), CTB (Color Temperature Blue), Green
* Color Effect Gels: Reds, Blues, Greens, Yellows, Magentas, Cyans, etc. Available in a huge array of shades.
* Neutral Density (ND) Gels: Reduce light intensity without changing color. Less common for portraiture, but useful in certain situations.
* Diffusion Gels: Soften the light output.
* Gel Holders: You'll need a way to attach the gels to your lights. This can be with:
* Gel Holders: Specifically designed to clip onto speedlights or studio strobes.
* Clothespins/Spring Clamps: A more budget-friendly option, but requires careful placement to avoid melting the gel (especially with hot lights). Avoid taping directly to the light itself.
* Gaffer's Tape: Heat-resistant tape to carefully secure the gel to the light modifier.
2. Planning Your Shoot:
* Concept & Mood: Before grabbing the gels, decide on the feeling you want to evoke in your portrait. Consider the following:
* Mood: Happy, sad, mysterious, energetic, futuristic, retro?
* Color Psychology: Research the associations of different colors.
* Red: Passion, energy, anger, excitement.
* Blue: Calmness, sadness, trust, stability.
* Yellow: Happiness, optimism, energy, caution.
* Green: Nature, growth, balance, envy.
* Purple: Luxury, royalty, mystery, creativity.
* Subject's Personality: Reflect their character with your color choices.
* Lighting Setup: Decide on the number of lights you'll use and their placement. Common setups include:
* Single Light: One light with a gel as a main light or accent light. Simple and effective.
* Two Lights: Two lights, each with a different gel, for split lighting effects.
* Three or More Lights: More complex setups for advanced color mixing and separation. Requires careful planning and execution.
* Background:
* Solid Color: A solid background helps the gel colors stand out. White or gray is a good starting point.
* Textured/Patterned: A textured background can add interest, but make sure it doesn't clash with your chosen colors.
* Colored Background: Using a seamless paper roll of a specific color can really make the scene pop.
* Wardrobe & Makeup: Coordinate clothing and makeup with your color scheme. Complementary colors can create a harmonious look, while contrasting colors can add drama. Consider the subject's skin tone when choosing colors.
* Test Shots: Crucially important! Take test shots with your chosen gels before your subject arrives. This allows you to fine-tune your lighting and color balance.
3. Essential Techniques:
* Light Metering: Gels will reduce the amount of light output. Use a light meter to determine the correct exposure, taking into account the light loss from the gels. Some newer strobes will automatically adjust the power output to compensate for light loss.
* White Balance: Set your camera's white balance *after* applying the gels. Use a custom white balance or select a preset that best matches the dominant color of your light. If you shoot RAW, you can adjust the white balance in post-processing.
* Color Mixing: Experiment with overlapping different colored gels to create unique hues. For example, blue and yellow can create green. However, be aware that mixing complementary colors (red and green, blue and orange, yellow and purple) will generally result in muddy browns.
* Split Lighting: Use two lights, each with a different colored gel, to illuminate different sides of the subject's face. This creates a dramatic and visually striking effect.
* Background Wash: Use one or more lights with gels to project color onto the background. This can create a sense of depth and atmosphere.
* Rim Light/Kicker: Place a light behind the subject with a gel to create a colorful rim light that separates them from the background.
* Negative Space and Shadows: Consider how the colored light interacts with shadows. Don't be afraid to let areas of the image fall into darkness, as this can create contrast and drama.
* Feathering: Softening the light from a gelled light by feathering it (aiming the edge of the light beam at the subject) can help create a more natural and pleasing effect.
* Distance: The closer the gelled light is to the subject, the smaller and more intense the beam will be. Moving the light further away will widen the beam and soften the light.
4. Practical Lighting Setups Examples:
* Single Light - Monochromatic Look: Use a single light with a blue gel positioned to the side of the subject. Create a moody and dramatic portrait with strong shadows.
* Two Lights - Complementary Colors: Place one light to the left of the subject with a blue gel and another light to the right with an orange gel. This creates a vibrant and eye-catching image with a clear separation between warm and cool tones.
* Three Lights - Rim Light & Background Wash: Use a key light with a neutral gel (or no gel) to illuminate the subject's face. Place two lights behind the subject, one with a red gel for a rim light and the other with a green gel to wash the background.
* Gel as Accent: Use a key light with no gel (or a diffusion gel), and then use a small speedlight with a gel aimed at a specific part of the subject (e.g., their hair, their hand, their background behind them) to create a subtle pop of color.
5. Post-Processing Considerations:
* Color Correction: Fine-tune the white balance and color tones in post-processing to achieve the desired look.
* Color Grading: Use color grading techniques to further enhance the colors and create a specific mood.
* Selective Color Adjustments: Adjust the saturation and luminance of individual colors to fine-tune the image.
6. Important Tips and Cautions:
* Heat: Always use heat-resistant gels, especially with continuous lights. Monitor the temperature of the gels and lights to prevent melting or damage.
* Fading: Gels can fade over time, especially with prolonged exposure to heat and light. Store them in a cool, dark place when not in use.
* Color Casts: Be aware of potential color casts on the subject's skin. Use neutral density gels or adjust your lighting to minimize these casts.
* Less is Often More: Don't overdo it with the gels. Subtle and well-planned color accents can be more effective than a riot of colors.
* Experiment! The best way to learn how to use colored gels is to experiment and see what works best for you. Don't be afraid to try new things and push the boundaries of your creativity.
In Summary:
Using colored gels can transform your portraits from ordinary to extraordinary. By understanding the basics of color theory, planning your lighting setups carefully, and experimenting with different techniques, you can create stunning and unique images that express your creative vision. Remember to start simple and gradually increase the complexity of your setups as you gain experience. Good luck, and have fun exploring the world of colored light!