Guide: Creating Brand-Consistent Infographics with Gemini Flash Image

Understanding AI-Powered Infographic Creation

If you simply ask Gemini's Nano Banana Pro model to "create an infographic," you'll typically get a cluttered output full of generic clip art and randomly placed text. The results look like AI slop rather than professional brand assets.

The difference between mediocre and professional output comes down to a structured prompting approach: building a detailed style guide, controlling how the AI handles text, and iterating systematically. This five-step framework produces infographics that match your brand guidelines consistently, turning any blog post, report, or content piece into a polished visual asset in roughly 15 minutes.

What You'll Need

Platform Access (Choose One)

• Regular Gemini (Recommended): Free to use, supports conversational iteration. Images include a small Gemini watermark (removable with AI tools afterward)

• NotebookLM: Free, no watermark, produces decent infographics — but you cannot iterate on results through chat, which is a significant limitation

• Google AI Studio: Most control over prompting, no watermark, but costs approximately 10-20 cents per image

Brand Assets

• 2-3 existing brand images or design examples (from your designer, website, or style references)

• Brand colors (hex codes) including primary, secondary, and background colors

• Font preferences (family, size, style for titles and body)

• Logo files if needed

Content

• The blog post, article, or text you want to turn into an infographic

Step 1: Choose Your Platform

Use regular Gemini for the best balance of cost, quality, and iteration capability. It's free, lets you refine results through conversational edits, and supports image uploads for style reference.

The watermark limitation is minor — any AI background removal tool can clean it up afterward.

Step 2: Build Your Style Guide with AI

This is the most important step. Your style guide is what transforms generic AI output into brand-consistent visuals.

Your style guide should define six attributes:

1. Aspect Ratio: 9×16 (vertical, best for social media and infographics), 16×9 (horizontal), or square

2. Resolution: Minimum 1K. You can go up to 2K or 4K, but avoid low-resolution output

3. Color Palette: Primary color, two to three secondary colors, and a background color (white works well as a default)

4. Typography: Font family, size, and style for both titles and body text

5. Layout: Structure preference such as grid layout with generous white space, two-column, or single-column flow

6. Illustration Style: This is the most critical attribute. Describe the visual treatment in detail — line work quality, shading technique, color treatment, and overall aesthetic. You can reference known styles (e.g., "New Yorker editorial illustrations" or "Harvard Business Review cartoons")

How to Create Your Style Guide

Upload 2-3 examples of your existing brand imagery or design references into AI (Gemini, ChatGPT, or Claude) and ask it to generate a style guide based on those six attributes. Iterate until the descriptions accurately capture your brand's visual identity.

For illustration style specifically, upload reference images and ask AI to describe the artistic technique in prompt-ready language. For example, a style guide might output descriptions like: "editorial ink and wash illustrations, sketchy visible brush strokes for line work, watercolor wash shading."

Step 3: Structure Your Prompt in Two Steps

Nano Banana Pro tends to add random, unwanted text to infographics even when instructed not to. The fix is to structure your prompt so the AI processes content in two sequential steps.

The Two-Step Prompt Structure

Create an infographic following these instructions:

STEP 1 — Parse the text I provide:
- Extract only the title and section headers
- Use the exact headlines as written
- Do not make up any text
- Do not include any other text beyond the extracted headlines

STEP 2 — Apply the style guide below to create the infographic:

[Aspect Ratio]: 9x16 vertical format
[Resolution]: Minimum 1K resolution
[Colors]: Primary: [hex code], Secondary: [hex codes], Background: #FFFFFF
[Typography]: [Your font family], [sizes for title and body], [style details]
[Layout]: [Your layout preference, e.g., grid with generous white space]
[Illustrations]: [Your detailed illustration style description from Step 2]

Now I'm going to paste text and I want you to follow the directions above exactly.

Then paste your full blog post or article text in a follow-up message.

The two-step separation forces the AI to first identify the correct text elements, then apply the visual treatment — significantly reducing unwanted text generation.

Step 4: Customize for Your Brand

The prompt above is a template. To match your specific brand, swap in your own style guide details. If you want to adopt or remix a different visual style entirely:

1. Find 2-3 infographic examples in a style you like

2. Upload them to Gemini

3. Ask it to update only the illustration section of your prompt to reflect the attached style, keeping everything else the same

4. Copy the updated illustration description into your master prompt

This lets you experiment with different visual approaches while maintaining your core brand colors, typography, and layout preferences.

Step 5: Iterate and Save Your Prompt

Unlike most AI image models, Nano Banana Pro handles conversational edits well. Always iterate on your current output rather than starting from scratch.

Refinement Examples

Use targeted, specific instructions for each edit:

• "Make sure the red circle is only on the most important title word"

• "Update the layout to a two-across grid"

• "Replace the illustration for [specific section] with [new description]"

• "No more robots — use human figures instead"

• "Add a brief text description below each section"

Lock In Your Improvements

After you've refined the infographic to your satisfaction, ask Gemini to update your original prompt:

Now update my infographic prompt to include all of the edits we just made, so we can get this output in one shot. Keep the character count of the prompt roughly the same. Bold any edits you make so I can review your changes.

This captures your iteration history into a single, improved prompt.

Save as a Gemini Gem

To avoid pasting the full prompt every time:

1. In Gemini, click Gems (Gemini's version of saved projects)

2. Create a new Gem and name it (e.g., "Brand Infographic")

3. Paste your finalized prompt into the instructions field

4. Save

From now on, open that Gem and simply paste the text you want visualized. Gemini will apply your full style guide and prompt structure automatically.

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