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Use when the user wants to shrink PNG files in a batch — losslessly with `oxipng` (typical 20–40% reduction, byte-identical decode) or aggressively with `pngquant` (lossy palette quantisation, 60–80% reduction with near-imperceptible quality loss for web use). Web-prep workhorse.
用 Codex 或 Claude 帮你安装 复制这段 Prompt，粘贴到 Codex、Claude 或其他助手里，让它检查 Skill 页面并帮你完成安装。
基于 SOC 职业分类
Batch-stamp copyright, artist, and rights information on all images in a directory. Use when you need to quickly add copyright metadata to a photo library before distribution or archival — a convenience wrapper around exiftool.
Decode JPEG XL images (.jxl) to PNG or JPEG. Use when you need to convert JXL files back to standard formats for compatibility, display, or further editing.
Extract embedded JPEG and PNG images from a PDF at their native resolution, without rasterizing. Use when a PDF is primarily a wrapper around photos or images and you want to recover them at full quality without the page rendering overhead.
Rasterize PDF pages to numbered image files (JPEG, PNG, or TIFF) at a specified resolution (DPI). Use when you need to convert PDF content to standalone images — one image per page — with optional page range selection.
Read and display EXIF, IPTC, XMP, and other metadata from images as structured JSON. Use when you need to inspect image metadata without modifying it — opposite of scrub-metadata, which removes metadata.
Write EXIF, IPTC, and XMP metadata tags to image files. Use when you need to add or update metadata like artist name, copyright, description, keywords, or GPS coordinates on individual images.
| name | optimize-png |
| description | Use when the user wants to shrink PNG files in a batch — losslessly with `oxipng` (typical 20–40% reduction, byte-identical decode) or aggressively with `pngquant` (lossy palette quantisation, 60–80% reduction with near-imperceptible quality loss for web use). Web-prep workhorse. |
Squeeze PNG file size. Two modes:
oxipng. Byte-identical decode. Always safe.pngquant. Palette-quantised; visible artefacts only on smooth gradients. Right call for web/UI assets.web-ready orchestrator.Do not use this skill when:
optimize-jpeg.web-ready end-to-end first.lossless mode.lossless (default) or lossy.--recursive for directory descent.--output-dir <path> to write copies.oxipng -o <0..6>. Default 4. 6 is ~20% slower for ~1–2% extra compression.pngquant --quality min-max. Default 65-80 (web-good). Increase floor for sensitive material.--strip removes EXIF/iTXt/zTXt/tIME chunks (oxipng --strip safe). Use when web-prep doesn't need camera info.Verify the relevant binary exists. which oxipng for lossless; which pngquant for lossy. If missing, point at install-deps.
Enumerate inputs (PNG only — skip non-PNG with a one-line note).
Lossless (oxipng):
oxipng -o <level> [--strip safe] [--out <out-dir>] "<input>"
In-place is the default; pass --out only if --output-dir was set. oxipng is multithreaded by default — no need to xargs-parallelise.
Lossy (pngquant):
pngquant --quality <min>-<max> --skip-if-larger --strip --output "<output>" "<input>"
--skip-if-larger is critical — pngquant occasionally produces a larger file on already-quantised inputs; this prevents inflation.
--strip removes optional chunks (default off in pngquant — explicitly enable for web-prep).
Track total before/after sizes; report the savings.
<orig-MB> → <new-MB> (<pct>% saved).oxipng lossless on a typical screenshot: 20–40% reduction. On already-optimised PNGs (e.g. via Photoshop "Save for Web"): often 1–5%.pngquant is irreversible. Keep originals if there's any chance the file will need further editing.pngquant → oxipng) gets a few extra % off — the orchestrator (web-ready) does this automatically; this skill keeps it as separate modes for explicit control.