Exexif

Read TIFF and EXIF information from a JPEG-format image.

1. Retrieve data from a file:

   iex> {:ok, info} = Exexif.exif_from_jpeg_file(path)
   

   Retrieve data from a binary containing the JPEG (you don't need the whole thing—the exif is near the beginning of a JPEG, so 100k or so should do fine).

   iex> {:ok, info} = Exexif.exif_from_jpeg_buffer(buffer)
   

2. Access the high level TIFF data:

   iex> info.x_resolution
   72
   iex> info.model
   "DSC-RX100M2"
   

3. The exif data is in there, too.

   iex> info.exif.color_space
   "sRGB"
   
   iex> info.exif |> Dict.keys
   [:brightness_value, :color_space, :component_configuration,
    :compressed_bits_per_pixel, :contrast, :custom_rendered, :datetime_original,
    :datetime_digitized, :digital_zoom_ratio, :exif_image_height,
    :exif_image_width, :exif_version, :exposure_bias_value, :exposure_mode,
    :exposure_program, :exposure_time, :f_number, :file_source, :flash,
    :flash_pix_persion, :focal_length, :focal_length_in_35mm_film,
    :iso_speed_ratings, :lens_info, :light_source, :max_aperture_value,
    :metering_mode, :recommended_exposure, :saturation, :scene_capture_type,
    :scene_type, :sensitivity_type, :sharpness, :white_balance] 
   

Todo

The exif tag list is missing some of the newer entries. Contributions welcome.

License and Copyright

See LICENSE.md