extract-image

extract-image converts a JSON file that contains image data to a file without by extracting the imageData to a JPEG file.

Why do you want to use this tool

Labelme by default saves the image you’re annotating into the JSON file as "imageData". This is useful since you can copy or move the JSON file anywhere and still open the file.

However, when you want to keep the original image file (like JPEG/PNG format), you will have duplicate image data stored both in the JSON and the image file. This wastes your storage.

For the new annotation, you can use labelme --nodata option to stop storing "imageData", but we need to do the conversion for old files.

This is when extract-image comes in.

Usage

Pass either a JSON file or directory of JSON files to the command.

labelmetk extract-image [OPTIONS] FILE_OR_DIR

Example: Convert a JSON file

If you only have a single JSON file, pass it to the command:

labelmetk extract-image dogs.json

Example: Convert a directory of JSON files

If you have multiple JSON files in a directory, pass the directory to the command:

labelmetk extract-image small_dataset