convert-image-to-jpg

Imported from tiangong-ai/agent-skills (convert-image-to-jpg/SKILL.md). Install upstream with npx skills add tiangong-ai/agent-skills --skill convert-image-to-jpg. Copyright stays with the author.

Convert Image to JPG

Core Goal

• Convert one local image or a directory tree of local images into .jpg.
• Write JPG DPI metadata as 96 by default or a caller-provided value.
• Preserve relative directory structure when the input path is a directory.

Required Tools

• Use scripts/convert_to_jpg.py.
• Rely only on Python standard library modules. Do not install Python packages for this skill.
• Prefer magick when it is installed.
• Fall back to macOS sips when magick is unavailable.
• Stop and report the missing dependency when neither backend exists.

Quick Start

1. Convert one file to a specific JPG path:

python3 scripts/convert_to_jpg.py \
  --input-path /path/to/image.heic \
  --output-path /path/to/output.jpg

2. Convert a directory recursively with custom DPI:

python3 scripts/convert_to_jpg.py \
  --input-path /path/to/input-images \
  --output-path /path/to/output-images \
  --dpi 300

3. Rewrite existing outputs in place or replace previous runs:

python3 scripts/convert_to_jpg.py \
  --input-path /path/to/input-images \
  --output-path /path/to/output-images \
  --overwrite

4. Preview the conversion plan without writing files:

python3 scripts/convert_to_jpg.py \
  --input-path /path/to/input-images \
  --output-path /path/to/output-images \
  --dry-run

Behavior

• Treat directory input as recursive and keep the same relative subdirectories in the output tree.
• Treat single-file --output-path as a directory when it has no .jpg or .jpeg suffix.
• Convert .jpg and .jpeg inputs too. Use this to normalize output names or rewrite DPI metadata.
• Default JPG quality to 95.
• Use the first frame or page when the source format can contain multiple frames, such as GIF or TIFF.
• Refuse ambiguous directory conversions when two source files would map to the same destination .jpg.
• Add uncommon extensions with --extra-extension .ext when needed.

Main Arguments

• --input-path: source file or source directory
• --output-path: output JPG file path or output directory
• --dpi: target DPI metadata for the JPG output, default 96
• --quality: JPG quality from 1 to 100, default 95
• --backend: auto, magick, or sips
• --extra-extension: additional directory-scan suffix to include
• --overwrite: replace existing outputs
• --dry-run: print the plan without converting files
• --limit: cap the number of files processed during a quick check

Script

• scripts/convert_to_jpg.py