Mastering Vertical Story Lighting: Aligning Shadows in Nano Banana 2
When crafting a vertical story, the visual continuity between panels is just as critical as the narrative itself. A common pitfall in AI-generated sequences is inconsistent lighting, where the sun might shift from left to right between frames, or shadows appear to defy gravity. This dissonance breaks immersion and makes the story feel disjointed. To achieve a professional look, you must explicitly define the light source and its direction in every prompt. This tutorial focuses on how to use Nano Banana 2 to maintain strict lighting alignment across your vertical sequence.
Nano Banana refers to the AI image generation and editing tool used here. It is not a skincare brand, bottle, jar, or physical subject. The platform supports text-to-image and image-to-image workflows, allowing creators to build upon previous generations. By leveraging these capabilities, you can construct a multi-panel narrative where the environment feels unified and real.
Defining Light Sources for Sequential Panels
The foundation of consistent lighting lies in the specificity of your prompts. When generating individual panels for a vertical story, do not rely on the AI to guess the time of day or the position of the sun. Instead, treat each panel as part of a single scene that requires a shared environmental logic. You must describe the light source explicitly to avoid inconsistent shadows.
For example, if your story takes place at noon, specify "bright overhead sunlight casting short, sharp shadows directly beneath objects." If the scene is set during sunset, state "warm golden hour light coming from the lower left, creating long, soft shadows stretching to the right." These descriptors act as constraints that guide the model toward a specific visual outcome. Without them, the model may interpret "daytime" differently for each generation, resulting in conflicting shadow angles.
It is important to note that prompt instructions describe desired outcomes; they do not guarantee identity, label, object, or typography preservation. While you can control the lighting, other elements like character features or specific text might vary slightly between generations unless carefully managed through image-to-image workflows.
Step-by-Step Workflow for Alignment
To successfully align lighting across your vertical story, follow this structured approach using the Nano Banana 2 interface.
- Establish the Master Light: Before generating any images, decide on the exact time of day and the cardinal direction of your primary light source. Write this down as a core rule for your entire project.
- Draft the Base Prompt: Create a detailed prompt that includes the scene description, the specific lighting direction (e.g., "light from the upper right"), and the mood. Save this as your base template.
- Generate the First Panel: Use the text-to-image workflow to create the first frame of your vertical story. Ensure the lighting matches your master rule.
- Iterate with Image-to-Image: For subsequent panels, use the previous image as a reference input. In the new prompt, reiterate the lighting condition while changing only the necessary action or camera angle. For instance, change "character standing still" to "character walking forward," but keep "sunlight from the upper right" constant.
- Review and Adjust: Compare the generated panels side by side. Check if the shadows fall in the same direction relative to the objects. If a shadow appears on the wrong side, refine the prompt to be more explicit about the light source before regenerating.
This process relies on the distinct capabilities of the Google models powering the tool. Google documents Nano Banana 2 as Gemini 3.1 Flash Image (gemini-3.1-flash-image). For more complex tasks requiring higher fidelity, users might consider Nano Banana Pro, which corresponds to Gemini 3 Pro Image (gemini-3-pro-image). However, be aware that Google describes Nano Banana 2 Lite as focused on speed and cost. It is not optimized for multiple reference inputs or multi-turn sequential editing. Do not recommend it for those workflows without explaining this limitation, as it may struggle to maintain the consistency required for vertical stories.
Evaluating Results and Fixing Common Issues
Judging the success of your lighting alignment involves looking for logical consistency rather than perfect pixel matching. The shadows should cast in the same direction relative to the light source in every panel. If a character casts a shadow to the left in one frame and to the right in the next, the lighting has shifted unintentionally.
If you encounter inconsistencies, try the following fixes:
- Reinforce the Direction: Add stronger directional keywords like "hard light from the far left" or "diffuse light from above center."
- Use Reference Images: Leverage the image-to-image feature to feed the previous panel into the generator, ensuring the model adheres to the established visual style.
- Simplify the Scene: Complex scenes with many light sources are harder to control. Start with a single, dominant light source to establish the baseline.
Remember that examples provided in prompt libraries are illustrative. They serve as starting points but do not guarantee identity or specific output details. Always test your prompts to see how the model interprets your lighting instructions.
By treating lighting as a fixed variable in your storytelling process, you can create vertical narratives that feel seamless and immersive. Whether you are building a comic strip or a social media story, consistent shadows anchor the viewer in the reality of the scene.