`image_metadata`

Extract metadata from an image file (dimensions, format, color type).

Parameters

pathstringone of path or source_key: Source image path (supports ${ctx.key} interpolation)
source_keystringone of path or source_key: Context key containing a source path
output_keystringdefault "image_metadata": Prefix for output values

Context Output

<output_key>_width — image width in pixels
<output_key>_height — image height in pixels
<output_key>_format — detected format from file extension (e.g. png, jpeg)
<output_key>_color_type — color type (e.g. Rgb8, Rgba8)

Example

local flow = Flow.new("image_metadata_demo")

flow:step("meta", nodes.image_metadata({
    path = "examples/fixtures/ironflow-sample.png",
    output_key = "img"
}))

flow:step("log", nodes.log({
    message = "Image: ${ctx.img_width}x${ctx.img_height} (${ctx.img_format})"
})):depends_on("meta")

return flow