1. Understanding the Basics
* What are gels? Colored gels (also called color filters) are translucent sheets of plastic placed in front of a light source to alter the color of the light.
* Why use them?
* Creativity: Gels introduce vibrant and unusual colors, creating eye-catching effects.
* Mood: Different colors evoke different emotions (e.g., blue for sadness, red for passion).
* Separation: You can use contrasting colors to separate your subject from the background.
* Drama: Bold colors create a sense of drama and visual interest.
* Correction/Balance: Gels can correct color casts or balance different light sources.
* Types of Gels:
* Correction Gels: Used to correct the color temperature of light sources (e.g., CTO - Color Temperature Orange - converts daylight-balanced light to tungsten).
* Creative Gels: Available in a vast range of colors to achieve specific artistic effects.
* Neutral Density (ND) Gels: Reduce the amount of light without affecting the color.
2. Equipment You'll Need
* Lights: Speedlights (strobes) are most common because they're portable and relatively inexpensive. Studio strobes offer more power and control. Continuous LED lights are another option, but be sure they get bright enough.
* Gels: Purchase a set of colored gels. Rosco and Lee Filters are reputable brands. Gel kits offer a variety of options.
* Gel Holders/Attachments: These attach to your lights and hold the gels in place. Many speedlights have dedicated gel holders. For studio strobes, you might need grids, snoots, or reflectors with gel holders. Clothespins or gaffer tape can work in a pinch, but they are not ideal.
* Light Stands: To position your lights.
* Modifiers (Optional): Softboxes, umbrellas, and grids can shape and soften the light, even when using gels.
* Camera: DSLR or mirrorless camera with manual mode.
3. Setting Up Your Lights
* Single Light Setup: Start simple. Place one light with a gel directly in front of your subject, to the side, or behind them for a rim light effect. This is the easiest way to learn how gels affect the scene.
* Two-Light Setup: A common setup is to use one light with a gel as a key light (main light) and another light with a different gel as a fill light or background light. Experiment with complementary colors (e.g., blue and orange) or analogous colors (e.g., blue and green).
* Three-Light Setup (and beyond): Add a third light to highlight the hair or create a dramatic rim light. You can use different colors for each light to add complexity.
* Background Light: Place a light with a gel behind your subject, aiming at the background to create a wash of color. This is great for separation.
4. Camera Settings
* Manual Mode (M): Essential for controlling aperture, shutter speed, and ISO.
* Aperture: Choose an aperture based on your desired depth of field. Wider apertures (e.g., f/2.8) create shallow depth of field, blurring the background. Narrower apertures (e.g., f/8) keep more of the image in focus.
* Shutter Speed: Sync speed is critical. Determine the max sync speed of your camera (often 1/200th or 1/250th of a second) and do not exceed it. If you do, a black band will appear in your photos. If your lights support High Speed Sync (HSS), you can exceed this limit and use faster shutter speeds.
* ISO: Keep your ISO as low as possible (ISO 100-400) to minimize noise. Increase it only if needed to brighten the image.
* White Balance: Setting a custom white balance is important. Use a gray card and the Kelvin scale to match the color of your lights or, choose "flash" as your white balance setting if you're using strobes. You can also adjust white balance in post-processing.
* Metering: Use spot metering and meter off the subject's skin. Adjust exposure compensation as needed. Chimping (reviewing your images on the camera's LCD) is crucial to ensure proper exposure and color balance.
5. Color Theory and Gel Combinations
* Complementary Colors: Colors opposite each other on the color wheel (e.g., red/green, blue/orange, yellow/purple). Using these together creates high contrast and visually dynamic images.
* Analogous Colors: Colors next to each other on the color wheel (e.g., blue/green, yellow/orange). These create a harmonious and balanced look.
* Triadic Colors: Three colors evenly spaced on the color wheel (e.g., red/yellow/blue).
* Subtractive Color Mixing: When using gels, remember that you're dealing with *subtractive* color mixing. This means that when you layer gels, you are *removing* wavelengths of light. For example, combining yellow and cyan gels will result in green.
* Experiment! Don't be afraid to try different combinations and see what you like.
6. Techniques and Ideas
* Two-Tone Portraits: Use one color for the key light and another for the fill or background light.
* Rim Lighting: Place a light with a gel behind the subject to create a colorful outline.
* Silhouette: Light the background with a bright color and underexpose the subject to create a silhouette.
* Color Gels on the Background: Create a colorful backdrop by aiming a gelled light at a plain wall or seamless paper.
* Color Accents: Use a small gelled light to add a splash of color to a specific part of the image, such as the eyes or hair.
* Combine Gels: Stack gels to create new colors and effects. For example, stacking a blue and a red gel can create purple.
* Use Patterns: Project patterns onto your subject or background using cookies (gobos) placed in front of a gelled light.
* Double Exposure (in camera or post): Combine a gelled portrait with another image for a surreal effect.
7. Post-Processing
* Color Correction: Adjust white balance, tint, and individual color channels in your editing software (e.g., Photoshop, Lightroom) to refine the colors.
* Grading: Use color grading techniques to enhance the overall mood and feel of the image.
* Skin Tones: Be mindful of skin tones. Overly saturated or unnatural skin tones can be distracting. Adjust skin tones to look pleasing while maintaining the overall color palette.
8. Tips for Success
* Start Simple: Begin with one light and one gel, then gradually add complexity.
* Practice: Experiment with different colors, lighting positions, and camera settings to learn what works best.
* Test Shots: Take test shots to see how the gels are affecting the image before you start shooting the actual portrait.
* Consider Your Subject: Choose colors that complement your subject's skin tone, hair color, and clothing.
* Communicate: Communicate your vision to your model so they understand the concept and mood you're trying to create.
* Don't Overdo It: Subtlety can be powerful. Sometimes, a touch of color is more effective than a full-blown color explosion.
* Have Fun! Experimenting with colored gels is a great way to unleash your creativity and create unique and memorable portraits.
By mastering the use of colored gels, you can elevate your portrait photography and create stunning, visually captivating images that express your artistic vision. Good luck, and have fun experimenting!