1. Understanding Lighting Gels:
* What they are: Thin, transparent sheets of colored plastic (typically acetate or polyester-based). They come in a wide variety of colors and densities.
* Purpose: To modify the color of a light source. By placing a gel in front of a light, you filter out certain wavelengths of light, allowing the remaining colors to pass through.
* Color Correction vs. Creative Gels:
* Color Correction (CTO, CTB, Plus Green/Minus Green): These gels are primarily used to balance the color temperature of different light sources. For example, you might use a CTO (Color Temperature Orange) gel on a strobe to make it match the warmer color temperature of incandescent lights.
* Creative Gels: These are for artistic effects. They come in a rainbow of hues (red, blue, green, purple, etc.) and are the ones you'll typically use to change your background color.
* Density (Saturation): Some gels are more saturated (deeper color) than others. A full-strength gel will have a more intense effect than a half-strength gel of the same color.
2. Essential Equipment:
* Light Source: Strobe, speedlight (flash), LED panel, or even a powerful incandescent bulb can work. *Avoid using gels with hot lights (tungsten) for extended periods, as the heat can melt or damage the gel.* LED lights are generally best for gel usage, due to lower heat production.
* Lighting Stand (Optional but Recommended): To position your light source independently of your main light.
* Gels: A selection of colors you want to use. Start with a basic set of primary colors (red, blue, green) to experiment.
* Gel Holder: A way to attach the gel to your light source. Options include:
* Gel Frames/Holders: Designed specifically for strobes and speedlights. They clip onto the light and hold the gel securely.
* Clothespins/Binder Clips: For a budget-friendly (but less elegant) solution, you can carefully clip the gel to the edges of the light. Be extremely careful that they don't touch the bulb (if using an incandescent).
* Gaffer Tape (Heat-Resistant): Use sparingly and with caution. Don't cover vents on the light. Some gaffer tape can leave residue.
* Subject: A person or object to photograph.
* Background: A plain background such as a paper backdrop, muslin, or even a white wall will allow the colors to show up most effectively.
* Main/Key Light (Optional): For your subject if needed.
* Light Meter (Optional): Helps ensure correct exposure.
3. Setting Up the Shot:
1. Choose Your Background: The more neutral the background (white, gray, or black), the more accurate and vibrant the gel color will be. Textured backgrounds will add interest but might diffuse the color.
2. Position the Background Light: Place the light with the gel *behind* your subject and aimed directly at the background. Experiment with the distance between the light and the background to adjust the intensity of the color.
* Closer Light = More Intense Color: The closer the light is to the background, the more saturated the color will appear. It will also create a smaller, more concentrated area of color.
* Farther Light = Softer Color: Moving the light farther away will spread the color more evenly across the background and make it less intense.
3. Attach the Gel: Securely attach the gel to your light source using your chosen method (gel frame, clips, or gaffer tape). Make sure the gel is properly aligned and covers the entire light-emitting surface.
4. Position Your Subject: Place your subject in front of the colored background. Consider the distance between your subject and the background.
5. Set Up Your Key Light (if needed): If you need to illuminate your subject separately, set up a key light. Consider using a softbox or other modifier to create a flattering light on your subject. *Avoid letting your key light spill too much onto the colored background, as it will wash out the color.*
6. Camera Settings:
* Aperture: Choose an aperture that gives you the desired depth of field. A wider aperture (e.g., f/2.8) will create a shallower depth of field, blurring the background and making the subject stand out. A smaller aperture (e.g., f/8) will give you a greater depth of field, keeping both the subject and background in focus.
* ISO: Keep your ISO as low as possible to minimize noise.
* Shutter Speed: Adjust your shutter speed to control the overall exposure.
* White Balance: Set your white balance to match the color temperature of your key light (if using one). You can also experiment with different white balance settings to create different effects. For example, if you're using a blue gel on the background, setting your white balance to "tungsten" might give the blue a more vibrant, almost neon look.
7. Power Levels: Adjust the power of your background light to control the intensity of the color. You might need to increase the power if the gel is very dense or if the light is far away from the background.
8. Take Test Shots: Review your test shots and adjust the light placement, power levels, and camera settings until you achieve the desired effect. Pay attention to how the color of the background interacts with your subject's skin tones and clothing.
4. Tips and Considerations:
* Color Combinations: Experiment with different color combinations. Complementary colors (e.g., red and green, blue and orange) can create a dramatic effect. Analogous colors (e.g., blue and purple) can create a more harmonious look.
* Diffusion: If the gelled light is too harsh, use a diffuser (e.g., a softbox, diffusion panel, or even a piece of tracing paper) to soften the light.
* Distance Matters: The distance between the light and the background, and the distance between the subject and the background, will affect the intensity and spread of the color.
* Multiple Gels: You can use multiple lights with different colored gels to create more complex and interesting backgrounds. Be mindful of how the colors mix.
* Hair Lights and Rim Lights: You can use gels on hair lights or rim lights to add a subtle color accent to your subject.
* Safety: Always be careful when working with lights and electricity. Don't overload circuits, and be mindful of the heat generated by the lights. Use heat-resistant gels if using hot lights.
* Practice: Experimentation is key! The more you practice with gels, the better you'll understand how they work and how to use them to create stunning effects.
* Color Theory: A basic understanding of color theory can be incredibly helpful in choosing gel colors that complement each other and your subject.
Example Scenario:
Let's say you want to create a portrait with a vibrant blue background.
1. Background: Use a white paper backdrop.
2. Light: Place a strobe behind the subject, pointing at the background.
3. Gel: Attach a full blue gel to the strobe.
4. Key Light: Place a softbox to the side of the subject.
5. Camera Settings: Adjust your aperture, ISO, and shutter speed for proper exposure. Set your white balance to daylight or tungsten, depending on the look you want to achieve.
6. Adjust: Adjust the power of the strobe and the position of the lights until you achieve the desired blue background and well-lit subject.
By following these steps and experimenting with different colors and techniques, you can use lighting gels to transform your backgrounds and create unique and visually stunning images. Good luck!