Legibility: Ensure watermark readable on both light/dark areas
Size: Keep subtle - should not distract from content
Contrast: Adjust opacity based on cover background
Prompt Integration
When watermark is enabled, add to image generation prompt:
Include a subtle watermark "[content]" positioned at [position]
with approximately [opacity*100]% visibility. The watermark should
be legible but not distracting from the main content.