folderify is a CLI tool written in Rust that generates pixel-perfect macOS folder icons from a mask image (PNG). It produces icons in all standard macOS sizes (16x16 through 512x512@2x) for both light and dark color schemes, and can optionally assign the generated icon to a target folder using macOS utilities like osascript, fileicon, or Rez. The tool embeds folder template icons as resources and uses ImageMagick for image processing (resizing, compositing, blurring) and iconutil for .icns conversion. The architecture is a single-binary CLI application with clear separation of concerns: argument parsing (clap), command execution wrappers, image processing logic (magick.rs), icon generation pipeline (icon_conversion.rs), and resource embedding. The main workflow reads the mask, trims and resizes it to a canonical size, then spawns threads to generate each icon resolution in parallel. After all resolutions are complete, it optionally creates an .icns file and assigns the icon to a target file or folder. The codebase demonstrates solid Rust practices: use of modern crates (clap derive, indicatif progress bars, shadow-rs build info), thread-based parallelism for independent tasks, and comprehensive CI with linting and tests. The engraving algorithm that composites the mask with folder templates using multiple ImageMagick operations (colorize, blur, composite with Dst_In/Dst_Out) is the core technical contribution, though it is tightly coupled to the project's specific resource templates and macOS icon conventions.