Thumbnail Generation Pipeline (v4 Locked)

Objective

Create a single unified YouTube thumbnail that fully occupies a 16:9 horizontal band with no wasted space.

Core Rules

• All important content MUST exist inside a 16:9 band
• Top and bottom outside the band MUST be empty
• No unused space inside the band
• Full edge-to-edge horizontal usage required
• No panels or segmentation
• One cohesive scene only

Text Requirements

• All required messages must appear
• Top row: spread across width
• Center: largest, dominant message
• Bottom row: spread across width
• No clustering
• No overlap that reduces readability

Density Requirements

• No empty sky or low-detail regions
• Background must be active and meaningful
• Every region contributes to urgency and clarity

Validation Checklist

• Crop top/bottom → image still complete
• All edges used horizontally
• All messages present
• No empty areas

Execution Prompt Template

Create a single unified YouTube thumbnail.

- Use a centered 16:9 band
- No important content outside the band
- Fill the band completely edge-to-edge

TEXT:
Top: [Message 1] + [Message 2]
Center: [Main message]
Bottom: [Message 3] + [Message 4]

Ensure:
- Full width usage
- No empty areas
- Strong visual intensity
- Clear readability