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Use when the user wants to generate thumbnails at scale — index views, contact sheets, web previews, or just shrinking a library to manageable sizes. Wraps `vipsthumbnail` for sub-second-per-image generation, much faster than ImageMagick on large batches.
Codex または Claude でインストール この Prompt をコピーして Codex、Claude、または他のアシスタントに貼り付けると、Skill ページを確認してインストールできます。
SOC 職業分類に基づく
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 | fast-thumbnail |
| description | Use when the user wants to generate thumbnails at scale — index views, contact sheets, web previews, or just shrinking a library to manageable sizes. Wraps `vipsthumbnail` for sub-second-per-image generation, much faster than ImageMagick on large batches. |
Generate thumbnails at high throughput using vipsthumbnail. Distinct from fast-resize: this is purpose-built for "make small previews of every image in this folder" workflows where output is always a downscale and quality is "good enough for a thumbnail".
Do not use this skill when:
fast-resize (or upscale-image for AI upscale).NxN (fit within square). Default: 512.<input>/thumbnails/. The skill never overwrites originals.jpg (best size/quality balance for thumbs). Options: jpg, png, webp, avif.80.--recursive to descend. Mirrors subdirectory structure under the output dir.--prefix <s> or --suffix <s> if collision is a risk.Verify vipsthumbnail is on PATH. If missing, point at install-deps. No graceful fallback — if vips isn't installed, the skill's whole reason to exist is gone; tell the user to install or use batch-resize.
Enumerate input files (image extensions only).
For each file:
vipsthumbnail "<input>" \
--size "<size>" \
--output "<output-dir>/<basename>.<ext>[Q=<quality>]"
For non-JPEG outputs, the [Q=N] syntax still works for WebP/AVIF.
For very large batches, parallelise with find ... | xargs -P <ncpu> -I{} vipsthumbnail .... vips is internally threaded but per-image work is small enough that process-level parallelism wins on >5k batches.
Track progress and skipped files (corrupt, wrong format).
<output-dir>/.<n> thumbnails, <total-output-MB>MB, <elapsed-s>s, avg <ms>ms/image.vipsthumbnail shrink-on-load: for JPEG sources, it decodes at the smallest DCT scale ≥ target — so generating a 256-px thumbnail from a 4000-px JPEG is much faster than full decode + resize. This is the headline reason to use it.--no-rotate and explicit --linear flags only if Daniel asks; the defaults are sensible for thumbnails.montage separately.--export-profile <path-to-srgb.icc>.