AI Generated Readme Banners

AI-Generated README Banners

Ultra-wide cinematic project branding — from ASCII art to professional visuals in minutes.

Last Updated: April 2026 | Models Verified: Replicate API

Staleness Watch: See EXTERNAL-API-REGISTRY.md for source URLs and recheck cadence

Core Pattern

Problem: ASCII art and SVG banners are limited; professional banner design is expensive and time-consuming.

Solution: Generate ultra-wide photorealistic banners using modern AI models with crystal-clear typography, professional composition, and project-specific branding in minutes.

Quality: Current-generation models (Ideogram v3, Recraft v4, FLUX Kontext, Imagen 4) produce stunning photorealistic results with excellent text rendering.

Model Selection Matrix (April 2026)

Typography-Capable Models (Recommended for Banners)

Clean Image Models (No/Limited Typography)

Recommendations by Use Case

Implementation Strategy

1. Default: Ideogram v3 Turbo (Best Value)

const output = await replicate.run("ideogram-ai/ideogram-v3-turbo", {
  input: {
    prompt: BANNER_PROMPT,
    aspect_ratio: '3:1',              // Widest supported (NOT '21:9')
    magic_prompt_option: 'Auto',      // 'Auto', 'On', or 'Off'
    style_preset: 'None',             // Or: 'Art Deco', 'Pop Art', etc.
    output_format: 'png',
  }
});

2. SVG Format: Recraft v4 SVG

const output = await replicate.run("recraft-ai/recraft-v4-svg", {
  input: {
    prompt: "Professional ultra-wide banner...",
    aspect_ratio: '16:9',             // Or: '1:1', '4:3', '3:2', '9:16'
  }
});
// Output is native SVG
await writeFile("banner.svg", output);

3. Highest Fidelity: FLUX 2 Max

const output = await replicate.run("black-forest-labs/flux-2-max", {
  input: {
    prompt: BANNER_PROMPT,
    aspect_ratio: '21:9',             // Ultra-wide supported
    resolution: '2 MP',               // Up to 4 MP available
    output_format: 'webp',
  }
});

Aspect Ratio Quick Reference

Note: Ideogram uses 3:1 for ultra-wide (NOT 21:9).

Banner Prompt Engineering

Compositional Structure for Ultra-Wide Format

- Left side: Main character/protagonist (1/3)
- Center: Thematic element/focal point (1/3)
- Right side: Environmental/world context (1/3)

Example Prompt Structure

Cinematic ultra-wide banner illustration for "[PROJECT NAME]" header.
[Genre/aesthetic description]

COMPOSITION (21:9 or 3:1 ultra-wide cinematic format):
- Left: [Character with specific details]
- Center: [Thematic focal point]
- Right: [Environment, atmosphere]

LIGHTING:
- [Specific techniques for each zone]

STYLE:
- [Art direction, realism level]

COLOR PALETTE:
- [Dominant colors, accents]

MOOD: [Emotional tone]

Typography Banners (Ideogram v3)

When to Add Text

• ✅ Project title needs immediate visibility
• ✅ Brand recognition through typography
• ✅ Standalone banner for social sharing
• ❌ Text changes frequently
• ❌ Multi-language support needed (use Nano Banana Pro instead)

Ideogram v3 Parameters (Current — April 2026)

// v3 Turbo — $0.03/image, fastest, best value
const input = {
  prompt: BANNER_PROMPT,
  aspect_ratio: '3:1',                   // Ideogram's widest (NOT '21:9')
  magic_prompt_option: 'Auto',           // 'Auto', 'On', or 'Off' (case-sensitive!)
  style_preset: 'None',                  // 80+ presets available
  style_reference_images: [],            // Up to 3 reference images (v3 only)
  output_format: 'png',
};

// Model IDs:
// ideogram-ai/ideogram-v3-turbo     $0.03 — fastest, best value
// ideogram-ai/ideogram-v3-balanced  $0.06 — quality/speed balance
// ideogram-ai/ideogram-v3-quality   $0.09 — highest quality, style refs

Style Presets (v3 new feature):

• None, 80s Illustration, Art Deco, Watercolor, Oil Painting
• Pop Art, Vintage Poster, Magazine Editorial, Graffiti, Bauhaus
• Collage, Cyberpunk, Steampunk, Minimalist, Maximalist
• 60+ more presets available

Ideogram v2 Parameters (Proven — Stable Fallback)

const input = {
  prompt: BANNER_PROMPT,
  aspect_ratio: '3:1',                  // Ideogram's widest (NOT '21:9')
  magic_prompt_option: 'On',            // 'On', 'Off', or 'Auto' (case-sensitive!)
  style_type: 'Realistic',              // v2 only: 'Realistic', 'General', 'Design'
  resolution: '1536x512',
  output_format: 'png',
};

Common Ideogram Mistakes

• ❌ magic_prompt_option: 'ON' → Must be 'On' (case-sensitive)
• ❌ style_type: 'CINEMATIC' → Invalid, use 'Realistic'
• ❌ aspect_ratio: '21:9' → Ideogram doesn't support, use '3:1'
• ❌ style_preset on v2 → Only v3 supports presets

Ideogram URL Handling Quirk

// Ideogram sometimes returns URL as getter function, not string
let imageUrl;
if (output && typeof output.url === 'function') {
  imageUrl = output.url().toString();
} else if (Array.isArray(output)) {
  imageUrl = output[0];
} else if (typeof output === 'string') {
  imageUrl = output;
} else if (output && output.url) {
  imageUrl = typeof output.url === 'object' && output.url.href 
    ? output.url.href 
    : output.url;
}

Alternative Typography Models

Recraft v4 (Design-Focused)

const output = await replicate.run("recraft-ai/recraft-v4", {
  input: {
    prompt: BANNER_PROMPT,        // Up to 10,000 characters
    aspect_ratio: '16:9',         // '1:1', '4:3', '3:2', '16:9', '9:16'
  }
});

Recraft strengths: "Design taste" built in, integrated text as structural element, coherent composition.

Google Imagen 4

const output = await replicate.run("google/imagen-4", {
  input: {
    prompt: BANNER_PROMPT,
    aspect_ratio: '16:9',         // '1:1', '9:16', '16:9', '3:4', '4:3'
    safety_filter_level: 'medium',
    output_format: 'webp',        // Or 'png'
  }
});

Imagen 4 strengths: Fine detail, fast (~4s), good typography, versatile styles.

Google Nano Banana Pro (Complex Text)

const output = await replicate.run("google/nano-banana-pro", {
  input: {
    prompt: BANNER_PROMPT,
    aspect_ratio: '16:9',
    reference_images: [],         // Up to 14 reference images!
    output_format: 'webp',
  }
});

Nano Banana Pro strengths: Best multilingual text, infographics, complex layouts, 4K output.

OpenAI GPT Image 1.5 (Dense Text)

const output = await replicate.run("openai/gpt-image-1.5", {
  input: {
    prompt: BANNER_PROMPT,
    quality: 'medium',            // 'low' ($0.01), 'medium' ($0.05), 'high' ($0.14)
    size: '1536x1024',
  }
});

GPT Image 1.5 strengths: Dense text layouts, UI mockups, precise editing, identity preservation.

FLUX Kontext Max (Edit + Typography)

const output = await replicate.run("black-forest-labs/flux-kontext-max", {
  input: {
    prompt: "Add the text 'PROJECT NAME' in bold...",
    input_image: existingImageUrl,  // Edit existing images
    aspect_ratio: '21:9',
  }
});

Kontext strengths: Edit existing images, add text overlays, improve typography in existing banners.

Typography Prompt Pattern (Validated)

Structure: Use clear labeled sections for best results with any typography model.

Professional technology banner (3:1 ultra-wide format).

TITLE TEXT (large, centered):
"[EXACT TEXT]"
- Bold modern sans-serif, uppercase
- [Color specification or gradient]
- Crystal clear, perfectly legible
- Sharp crisp lettering

SUBTITLE TEXT (below title):
"[Exact subtitle]"
- Clean font, [color]
- Readable professional typography

[VISUAL ELEMENTS]:
- [Specific objects, positioned where]
- [Prominent features, branding elements]
- Photorealistic 3D rendering

BOTTOM [CORNER] (optional):
- [Logo mark description]
- "[Brand text]" in [color]

BACKGROUND COMPOSITION (3:1 ultra-wide):
- [Gradient colors with hex codes]
- [Atmospheric elements: stars, particles, etc.]
- [Lighting effects: glows, halos]

LIGHTING:
- [Specific lighting techniques]
- [Glow sources and colors]
- Modern cinematic quality

COLOR PALETTE:
- Background: [hex codes]
- Accents: [hex codes]
- Text: [color with effects]

STYLE:
- Photorealistic 3D rendering
- [Aesthetic description]
- Sharp detail, cinematic quality

TEXT QUALITY CRITICAL:
- Crystal clear text rendering
- No distortion whatsoever
- Perfect spelling: "[EXACT TEXT]"
- Professional typographic hierarchy

MOOD: [Emotional tone, brand feeling]

Key Principles:

1. Explicit spelling in quotes — always specify exact text
2. Structured sections — TITLE TEXT, SUBTITLE TEXT, BACKGROUND, etc.
3. Crystal clear demands — "crystal clear", "sharp", "perfectly legible"
4. Hex color codes — specific colors (#0078d4) for brand consistency
5. Layout variations — left-aligned, centered, right-aligned for variety
6. Photorealistic 3D — emphasize render quality in prompt
7. TEXT QUALITY CRITICAL section — reinforces typography requirements

Layout Variations Strategy

Generate multiple composition variations for visual comparison:

1. Left-aligned — Visual element on left, text on right
2. Centered — Centered focal point, text below
3. Right-aligned — Visual element on right, text on left

Benefits:

• Side-by-side comparison for stakeholder review
• Audience targeting (different focus areas per banner)
• A/B testing on social media
• Seasonal/campaign variations

Cost (3 variations):

• Ideogram v3 Turbo: $0.09 (best value)
• Imagen 4 Fast: $0.06 (fastest)
• Ideogram v3 Quality: $0.27 (premium)

Cost Comparison (April 2026)

Best Value Typography Options

Clean Visuals (No Typography)

Recommendations

• Budget + Good: Ideogram v3 Turbo ($0.03) or Imagen 4 Fast ($0.02)
• Balanced: Recraft v4 ($0.04) — design taste built in
• Premium: Ideogram v3 Quality ($0.09) — style references
• Complex layouts: Nano Banana Pro ($0.15) — multilingual, infographics
• Iteration: FLUX Schnell ($0.003) + markdown overlay

Script Templates

Recommended: Ideogram v3 Turbo (Best Value)

import Replicate from 'replicate';
import fs from 'fs-extra';
import https from 'https';

const replicate = new Replicate({
  auth: process.env.REPLICATE_API_TOKEN,
});

const BANNER_PROMPT = `Professional technology banner (3:1 ultra-wide format).

TITLE TEXT (large, centered):
"PROJECT NAME"
- Bold modern sans-serif, uppercase
- Gradient from deep blue to vibrant purple
- Crystal clear, perfectly legible

BACKGROUND COMPOSITION:
- Deep space gradient (#080810 → #0d1520)
- Modern tech geometric patterns
- Radial glow effects

COLOR PALETTE:
- Background: Deep blue (#0078d4), purple (#7c3aed)
- Text: White with blue glow

TEXT QUALITY CRITICAL:
- Crystal clear sharp letterforms
- Perfect spelling: "PROJECT NAME"

MOOD: Inspiring, professional, cutting-edge technology`;

const output = await replicate.run('ideogram-ai/ideogram-v3-turbo', {
  input: {
    prompt: BANNER_PROMPT,
    aspect_ratio: '3:1',
    magic_prompt_option: 'Auto',
    style_preset: 'None',          // Or 'Cyberpunk', 'Art Deco', etc.
    output_format: 'png',
  }
});

// Handle various output formats
let imageUrl = Array.isArray(output) ? output[0] : output;
if (typeof imageUrl === 'object') {
  imageUrl = imageUrl.url?.() || imageUrl.url || imageUrl.href;
}

await downloadImage(imageUrl.toString(), 'assets/banner.png');
console.log('✅ Banner generated: assets/banner.png');
console.log('💰 Cost: $0.03');

Alternative: Recraft v4 (Design Aesthetic)

const output = await replicate.run('recraft-ai/recraft-v4', {
  input: {
    prompt: `Ultra-wide banner for "PROJECT NAME" with integrated typography.
Modern tech aesthetic, gradient blues and purples, geometric patterns.
Clean professional design with bold title text.`,
    aspect_ratio: '16:9',
  }
});

// Recraft returns direct URL
await downloadImage(output[0], 'assets/banner-recraft.png');
console.log('💰 Cost: $0.04');

Alternative: Clean + Markdown (FLUX 2)

const output = await replicate.run('black-forest-labs/flux-2-max', {
  input: {
    prompt: `Ultra-wide cinematic banner for technology project.
Deep space gradient, scattered stars, radial glow.
Modern tech aesthetic, geometric patterns.
NO TEXT - clean visual composition.`,
    aspect_ratio: '21:9',
    resolution: '2 MP',
    output_format: 'webp',
  }
});

await downloadImage(output, 'assets/banner-clean.webp');
console.log('💰 Cost: ~$0.04');
// Add text via markdown overlay in README

Helper: Download Image

async function downloadImage(url, filepath) {
  return new Promise((resolve, reject) => {
    const file = fs.createWriteStream(filepath);
    const protocol = url.startsWith('https') ? https : require('http');
    protocol.get(url, (response) => {
      if (response.statusCode === 302 || response.statusCode === 301) {
        // Follow redirect
        return downloadImage(response.headers.location, filepath)
          .then(resolve).catch(reject);
      }
      response.pipe(file);
      file.on('finish', () => { file.close(); resolve(); });
    }).on('error', (err) => {
      fs.unlink(filepath, () => {});
      reject(err);
    });
  });
}

Batch Generation with Rate Limiting

const BANNERS = [
  { id: 'main', filename: 'banner-main.png', title: 'PROJECT NAME' },
  { id: 'dev', filename: 'banner-dev.png', title: 'FOR DEVELOPERS' },
  { id: 'learn', filename: 'banner-learn.png', title: 'START LEARNING' },
];

for (const banner of BANNERS) {
  const output = await replicate.run('ideogram-ai/ideogram-v3-turbo', {
    input: {
      prompt: createPrompt(banner.title),
      aspect_ratio: '3:1',
      magic_prompt_option: 'Auto',
      output_format: 'png',
    }
  });
  
  let url = Array.isArray(output) ? output[0] : output;
  if (typeof url === 'object') url = url.url?.() || url.url || url.href;
  
  await downloadImage(url.toString(), `assets/${banner.filename}`);
  console.log(`✅ ${banner.filename}`);
  
  // Rate limiting: 2 seconds between requests
  await new Promise(r => setTimeout(r, 2000));
}

console.log(`💰 Total: $${(BANNERS.length * 0.03).toFixed(2)}`);

### Package.json Integration

```json
{
  "scripts": {
    "generate:banner": "node scripts/generate-banner.js",
    "generate:banner-text": "node scripts/generate-banner-with-text.js"
  }
}

README Integration

With Typography (Ideogram/Recraft)

<div align="center">

![Project Name](assets/banner.png)

**[Tagline]**

</div>

<!-- Generate: npm run generate:banner-text -->

Without Typography (FLUX + Markdown)

<div align="center">

![Project Name](assets/banner-clean.webp)

# Project Name

**[Tagline]**

</div>

<!-- Generate: npm run generate:banner -->

Key Insights

Model Selection Strategy

Structured Prompts = Better Results

Pattern: Use labeled sections (TITLE TEXT, BACKGROUND, LIGHTING, etc.)

Why it works:

• Models parse structured input more reliably
• Clear hierarchy produces professional composition
• Explicit requirements prevent ambiguity
• Easier to iterate and refine specific sections

Brand Consistency Through Hex Codes

Technique: Specify exact hex codes in prompts

• Background: Deep space blue (#080810 → #0d1520)
• Primary: Azure blue (#0078d4)
• Accent: Vibrant purple (#7c3aed)
• Highlight: Electric teal (#14b8a6)

Rate Limiting Best Practice

await new Promise(resolve => setTimeout(resolve, 2000));

Requirement: 2-second delay between Replicate API calls to prevent rate limit errors.

Visual Verification (VS Code 1.112+)

After generation, use view_image to assess banner quality:

• Typography legibility — Text is sharp, correctly spelled, readable at README scale
• Brand color accuracy — Palette matches project branding guidelines
• Composition balance — Visual weight distributed evenly, no awkward cropping
• Artifact detection — No smeared text, misshapen objects, or inconsistent edges

Cross-Project Applicability

✅ Ideal use cases:

• GitHub README headers (3:1 aspect ratio)
• Project landing pages
• Documentation portals
• Marketing materials
• Multi-variant A/B campaigns
• Personal branding (LinkedIn, portfolio)

❌ Not ideal:

• Social media (need 1:1, 4:5, 16:9 ratios)
• Book covers (need portrait 2:3, 4:5)
• Character references (need square 1:1)
• Frequent text changes (use FLUX + markdown)

Real-World Validation

Alex Cognitive Architecture (February-April 2026):

• ✅ 6 banners with Ideogram v2 → migrated to v3 Turbo
• ✅ Perfect text rendering with brand colors
• ✅ 63% cost reduction with v3 Turbo ($0.48 → $0.18 for 6 banners)
• ✅ Quality maintained or improved

Validated Models (April 2026):

• Ideogram v3 Turbo: Excellent typography, best value
• Recraft v4: Strong design aesthetic
• FLUX 2 Max: Highest fidelity clean images
• Imagen 4: Fast, good quality

Key Learning: Ideogram v3 Turbo is the new gold standard — 63% cheaper than v2 with equivalent or better quality.