Default metadata extractor using the Image library for images.
Extracts dimensions, format, alpha channel presence, and EXIF data from
images when the :image library (libvips) is available. For audio and
video files, extracts basic format information from the MIME type.
When the :image library is not installed, gracefully falls back to
extracting only basic format information from the MIME type and file
extension — no error is raised.
Extracted Fields
Images (requires :image)
"width"— width in pixels"height"— height in pixels"format"— detected format string (e.g."jpeg","png","webp")"has_alpha"— boolean, whether the image has an alpha channel"exif"— map of EXIF data (when present in the file)
Audio / Video
"format"— format derived from MIME subtype (e.g."mp4","mp3")
All files
"type"— broad type category:"image","video","audio","document", or"other"