I. Understanding the Basics:
* What are Gels? Colored gels (or filters) are transparent sheets of colored plastic designed to be placed over light sources. They modify the color of the light emitted, adding a specific hue to your subject or background.
* Types of Gels:
* Color Correction Gels (CTO/CTB): Used to adjust the color temperature of light sources. CTO (Color Temperature Orange) converts daylight (blue-ish) to tungsten (warm orange). CTB (Color Temperature Blue) does the opposite.
* Color Effects Gels: Available in a vast range of colors – reds, blues, greens, yellows, purples, etc. – to create specific moods and visual effects.
* Neutral Density (ND) Gels: Reduce the intensity of light without affecting its color. Useful for balancing light ratios.
* Gel Sizes: Gels come in various sizes. Larger sheets can be cut to fit your specific lights. Smaller, pre-cut gels are also available, often designed for specific flash models.
* Gel Holders/Clamps: You'll need a way to attach the gels to your lights. Common options include:
* Gel Holders: Designed to clip directly onto flash heads or studio strobes.
* Clothespins/Binder Clips: Simple and cheap, but might not be as secure.
* Gaffer Tape: Useful for securing gels to barn doors or reflectors. (Be careful not to get the gel too close to hot lights as they can melt.)
II. Equipment You'll Need:
* Camera: Any DSLR or mirrorless camera that allows manual control over aperture, shutter speed, and ISO.
* Lens: A portrait lens (e.g., 50mm, 85mm) is ideal, but any lens can work.
* Lights:
* Speedlights (Flashes): Portable and versatile, great for on-location work.
* Studio Strobes: More powerful and consistent, often used in studio settings.
* Continuous Lights (LED panels): Good for seeing the effect in real-time, but often less powerful than strobes. Make sure they are heat-resistant LEDs.
* Colored Gels: A variety pack is recommended to experiment with different colors.
* Gel Holders/Clamps/Tape: As mentioned above.
* Light Stands: To position your lights.
* Modifiers (Optional): Softboxes, umbrellas, reflectors, snoots, grids can help shape and control the light.
* Light Meter (Optional): Useful for precise exposure control, but not essential.
III. Setting Up Your Shot: A Step-by-Step Guide
1. Plan Your Concept:
* Define the Mood: What feeling do you want to evoke? Sadness, joy, mystery, excitement? Different colors elicit different emotions.
* Consider the Story: What narrative are you trying to tell? Use colors to enhance the storyline.
* Think about Color Harmony: Do you want contrasting colors for a dramatic effect, or complementary colors for a more harmonious look?
2. Position Your Subject: Consider their pose and expression in relation to the lighting you will create.
3. Set Up Your Lights: Experiment with different lighting setups. Here are a few basic ideas:
* Single Light Setup: Place a single light with a gel to illuminate the subject directly. Simple but effective for creating a dramatic, color-washed look.
* Two-Light Setup:
* Key Light + Fill Light: Use one light (the key light) with a gel as the main light source. Use a second light (the fill light) without a gel or with a subtle gel to fill in shadows and balance the exposure.
* Rim Lighting (Hair Light): Place a light behind the subject with a gel to create a colored outline around their head and shoulders.
* Background Light: Use one light with a gel to illuminate the background only, separating the subject from the backdrop.
* Three-Light Setup: Combine elements of the two-light setups for even more control. For example, a key light with a gel, a fill light, and a background light.
4. Attach the Gels: Secure the gels to your lights using your chosen method. Ensure they cover the entire light source to avoid uneven color.
5. Camera Settings:
* Shoot in RAW: This gives you the most flexibility in post-processing.
* Manual Mode: Essential for controlling your exposure.
* Aperture: Choose an aperture based on your desired depth of field. A wider aperture (e.g., f/2.8, f/4) will create a shallow depth of field, blurring the background. A narrower aperture (e.g., f/8, f/11) will keep more of the image in focus.
* Shutter Speed: Start with a shutter speed that syncs with your flash (usually around 1/200th of a second). Adjust as needed for ambient light.
* ISO: Keep your ISO as low as possible (e.g., ISO 100) to minimize noise. Increase it only if necessary.
* White Balance: This is crucial!
* Custom White Balance: Ideally, use a gray card to set a custom white balance *before* adding the gels. This will give you a neutral base to work with.
* Preset White Balance: You can also experiment with preset white balance settings (e.g., "Tungsten," "Daylight") to see how they affect the colors. Be prepared to adjust in post.
* Auto White Balance (AWB): AWB is usually *not* recommended when using colored gels, as it will try to correct the colors, potentially negating the effect you're trying to achieve.
6. Power Settings: Adjust the power of your lights to achieve the desired exposure. A light meter can be helpful here.
7. Take Test Shots: Take several test shots and examine the results on your camera's LCD screen. Pay attention to the color, exposure, and shadows. Make adjustments to your light positions, power settings, camera settings, and gel choices as needed.
IV. Color Theory and Creative Ideas
* Color Psychology: Be aware of the emotions and associations linked to different colors.
* Red: Passion, energy, anger, danger.
* Blue: Calmness, serenity, sadness, trust.
* Green: Nature, growth, envy, harmony.
* Yellow: Happiness, optimism, warmth, caution.
* Purple: Royalty, mystery, creativity, spirituality.
* Color Combinations:
* Complementary Colors: Colors opposite each other on the color wheel (e.g., red and green, blue and orange, yellow and purple) create a striking contrast.
* Analogous Colors: Colors next to each other on the color wheel (e.g., blue, blue-green, green) create a harmonious and calming effect.
* Triadic Colors: Three colors evenly spaced on the color wheel (e.g., red, yellow, blue) provide a vibrant and balanced look.
* Creative Effects:
* Dual Lighting: Use two different colored gels on separate lights to illuminate the subject from different angles.
* Split Lighting: Light one side of the subject's face with one color and the other side with a different color.
* Monochromatic: Use different shades of the same color for a subtle and sophisticated look. Use a full-strength gel for the key light, and a lighter diffusion of the same color on a fill light.
* Background Washes: Use gels to create a vibrant and colorful backdrop.
* Gobo Effects: Cut shapes out of black cardstock and place them in front of a gelled light to project patterns onto the subject or background.
* Double Exposure: Combine a gelled portrait with another image in post-processing for a surreal effect.
* Skin Tones: Be mindful of how colored gels affect skin tones. Some colors can make skin look unnatural or unhealthy. Experiment and find colors that complement your subject's complexion. Avoid overpowering the color of the skin with too much gel power.
V. Post-Processing
* Color Correction: If your white balance was off, you can adjust it in post-processing.
* Color Grading: Fine-tune the colors to achieve your desired look. Experiment with adjusting the hue, saturation, and luminance of individual colors.
* Dodging and Burning: Enhance highlights and shadows to add depth and dimension.
* Noise Reduction: If necessary, apply noise reduction to clean up any unwanted grain.
* Sharpening: Apply a final sharpening pass to enhance the details.
VI. Tips and Tricks
* Start Simple: Begin with a single light and one or two gels before moving on to more complex setups.
* Experiment and Play: Don't be afraid to try new things and break the rules. The best way to learn is through experimentation.
* Use Diffusion: Using a diffuser in front of the gelled light can soften the light and create a more pleasing effect.
* Watch Out for Color Casts: Gels can cause color casts on the surrounding environment. Use flags or black foam core to control spill light.
* Keep Gels Cool: Be aware of the heat produced by your lights. Use gels that are heat-resistant and keep them away from the bulb. LED panels generally produce less heat than strobes.
* Practice White Balance: Mastering custom white balance is key to getting consistent and accurate colors.
* Consider the Model's Clothing and Makeup: The colors in your model's clothing and makeup should complement the gels you are using. Neutral clothing and makeup are often a good choice.
* Location, Location, Location: Think about using natural light in conjunction with gelled artificial lights. Shoot near twilight for some lovely color combinations.
* Consider the Story: How does the color add to or detract from your story? Use the right colors to enhance the impact.
* Gel Fading: Cheaper gels can fade over time, especially with powerful lights. Keep an eye on the color and replace them as needed.
Using colored gels can open up a world of creative possibilities for your portraits. By understanding the basics of lighting, color theory, and post-processing, you can create stunning and unique images that capture the imagination. Remember to practice, experiment, and have fun!