imagegen

What problem does it solve? Websites need real visual assets—logos, mascots, og:images, in-page illustrations, user-scene photos—but manually prompting an image model, verifying output quality, compressing files, and placing them in the right project directories is repetitive and error-prone. This Skill turns a visual asset request into a complete pipeline: prompt writing, generation via Codex's built-in image_gen tool, three-stage acceptance checks, compression, and correct file placement, enforcing the no-placeholder-image rule. ## Core Features & Use Cases - Prompt Engineering Templates: Ready-made templates for seven asset types (logo/favicon source, mascot, og:image, in-page illustration, photorealistic user-scene, hand-drawn/watercolor illustration, cinematic poster) with required elements like hex palettes, exact dimensions, and "No text, no watermarks" constraints. - Three-Stage Acceptance: Contact-sheet thumbnail review at 120px, alpha bounding-box occupancy measurement (target 75-80%), and independent blind evaluation to catch composition, sizing, and style defects. - Compression & Placement: sips/cwebp/ImageMagick commands to convert multi-MB PNGs into web-ready JPEG/WebP, with per-asset-type directory conventions (public/brand/, public/og/, public/images/). - Use Case: A rankup site build needs a transparent mascot logo and a 1200x630 og:image. This Skill writes the prompt file, runs codex exec in the background, verifies true alpha transparency, fixes the 62% occupancy via ImageMagick trim/resize, and delivers compressed files to the correct public directories. ## Quick Start Ask the agent to generate a transparent 1024x1024 mascot logo and a 1200x630 og:image for your site using the imagegen skill, specifying your brand colors as hex values.