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Use when the user wants to shrink JPEG files — losslessly with `jpegoptim` (~5–15% reduction, no re-encode) or with re-compression via `mozjpeg` (~10–15% better than libjpeg-turbo at the same visual quality). Web-prep workhorse for photo libraries.
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-jpeg |
| description | Use when the user wants to shrink JPEG files — losslessly with `jpegoptim` (~5–15% reduction, no re-encode) or with re-compression via `mozjpeg` (~10–15% better than libjpeg-turbo at the same visual quality). Web-prep workhorse for photo libraries. |
Squeeze JPEG file size. Two modes:
jpegoptim --strip-all. Repacks Huffman tables and strips metadata. No re-encode, no quality change.mozjpeg (cjpeg-mozjpeg). Re-encodes with better quantisation tables; 10–15% smaller than libjpeg-turbo for the same SSIM. Quality flag controls trade-off.web-ready orchestrator.Do not use this skill when:
optimize-png.web-ready (or convert first).lossless (default) or recompress.--recursive for directory descent.--output-dir <path> to write copies.cjpeg-mozjpeg -quality N. Default 82 (web-quality). 90 for archival; 75 for aggressive web compression.on for both modes. EXIF/IPTC/XMP gone. Use --keep-metadata to preserve.on. Smaller files + better perceived load. --baseline to disable for compatibility with very old decoders.Verify the relevant binary. which jpegoptim for lossless; which cjpeg-mozjpeg (or fallback which cjpeg) for recompress. If missing, point at install-deps.
Enumerate inputs (JPEG/JPG only — skip with note).
Lossless (jpegoptim):
jpegoptim --strip-all --all-progressive [--dest <out-dir>] "<input>"
--all-progressive forces progressive output (smaller). --strip-all removes EXIF/IPTC/XMP/comments. Drop these if --keep-metadata was set.
Recompress (mozjpeg):
mozjpeg's CLI is decode-then-encode, so for in-place behaviour:
djpeg "<input>" | cjpeg-mozjpeg -quality <q> -progressive [-optimize] > "<output>"
Or use jpegtran-mozjpeg for lossless transforms when only metadata stripping + Huffman repack is desired (essentially a faster jpegoptim).
For batch, parallelise with xargs -P <ncpu>.
Sanity-check: any output file >95% of input size in recompress mode — keep the original instead. cjpeg-mozjpeg occasionally inflates already-optimised inputs.
<orig-MB> → <new-MB> (<pct>% saved).identify -format "%Q"), surface a warning per file.lossless mode. Free win.web-ready) defaults to: resize first, then encode WebP/AVIF, fall back to mozjpeg for JPEG output. This skill exists to do JPEG-only optimisation without that pipeline.