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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.
Codex 또는 Claude로 설치 이 Prompt를 복사해 Codex, Claude 또는 다른 어시스턴트에 붙여 넣으면 Skill 페이지를 검토하고 설치를 진행할 수 있습니다.
SOC 직업 분류 기준
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.