# `Image.Exif`
[🔗](https://github.com/elixir-image/image/blob/v0.67.0/lib/image/exif.ex#L1)

Functions to extract and interpret image EXIF
data.

# `context`

```elixir
@type context() :: {value(), non_neg_integer(), (any() -> non_neg_integer())}
```

# `t`

```elixir
@type t() :: %{
  :brightness_value => float(),
  :color_space => binary(),
  :component_configuration => binary(),
  :compressed_bits_per_pixel => non_neg_integer(),
  :contrast => binary(),
  :custom_rendered => binary(),
  :datetime_digitized => binary(),
  :datetime_original => binary(),
  :digital_zoom_ratio => non_neg_integer(),
  :exif_image_height => non_neg_integer(),
  :exif_image_width => non_neg_integer(),
  :exif_version => binary(),
  :exposure_mode => binary(),
  :exposure_bias_value => non_neg_integer(),
  :exposure_program => binary(),
  :exposure_time => binary(),
  :f_number => non_neg_integer(),
  :file_source => binary(),
  :flash => binary(),
  :flash_pix_version => binary(),
  :focal_length_in_35mm_film => non_neg_integer(),
  :focal_length => float(),
  :iso_speed_ratings => non_neg_integer(),
  :lens_info => [float()],
  :light_source => non_neg_integer(),
  :max_aperture_value => float(),
  :metering_mode => binary(),
  :recommended_exposure => non_neg_integer(),
  :saturation => binary(),
  :scene_capture_type => binary(),
  :scene_type => binary(),
  :sensitivity_type => binary(),
  :sharpness => binary(),
  :white_balance => binary(),
  optional(binary()) => binary()
}
```

# `value`

```elixir
@type value() :: binary()
```

# `extract_exif`

Extract EXIF data from a binary blob.

# `field`

```elixir
@spec field(:artist | :copyright | atom() | String.t()) :: String.t()
```

Returns the libvips header field name for a known EXIF field
alias.

### Examples

    iex> Image.Exif.field(:artist)
    "exif-ifd0-Artist"

    iex> Image.Exif.field(:copyright)
    "exif-ifd0-Copyright"

    iex> Image.Exif.field("anything-else")
    "anything-else"

# `read_exif`

---

*Consult [api-reference.md](api-reference.md) for complete listing*