Cover Editor and Visual Prep

The video-cover-generator Skill outputs a cover-editor JSON artifact. Lumo detects the payload and opens it as an editable cover surface instead of plain JSON.

The cover editor supports canvas size, aspect presets, zoom, layers, text layers, background layers, visibility, position, colors, and export. Use it to keep cover structure, visual subject, headline, and export review in one place before publishing.

You can drop an image into the cover canvas as a subject layer. The image is added as-is, so photos with clean or solid backgrounds work best. AI-generated stickers usually arrive ready to place.

Cover editor artifacts are reviewable inside Lumo. Export PNG only after you have checked text hierarchy, crop, platform ratio, and visual subject.

Before editing text and layers, decide whether the cover is for a horizontal video, vertical clip, or square/social preview. The same headline and subject may need different crop, scale, and safe area across YouTube, Bilibili, Xiaohongshu, Douyin, TikTok, or other channels.

The best cover prompt usually comes from the same brief as the script: viewer pain point, central promise, visual subject, emotional angle, and one short headline. If the cover feels disconnected, return to the script Artifact or calendar entry and ask Lumo to derive a tighter cover direction.

A cover may look fine at editor size but fail as a thumbnail. Check whether the headline survives small size, whether the subject is recognizable, whether contrast is clear, and whether platform UI will cover important text.

Generated cover Artifacts are most useful for quickly forming layout, hierarchy, and subject direction. Before publishing, replace weak source images, correct text, adjust crop, and export only the version that matches the actual content.