Generic image metadata handling: gexiv2 Reference Manual

## Generic image metadata handling Generic image metadata handling — Class to handle the various image metadata standards |

## Functions

GExiv2Metadata * | gexiv2_metadata_new ()
void | gexiv2_metadata_free ()
gboolean | gexiv2_metadata_try_has_tag ()
gboolean | gexiv2_metadata_try_clear_tag ()
void | gexiv2_metadata_clear ()
const gchar * | gexiv2_metadata_try_get_tag_label ()
const gchar * | gexiv2_metadata_try_get_tag_description ()
const gchar * | gexiv2_metadata_try_get_tag_type ()
gboolean | gexiv2_metadata_try_tag_supports_multiple_values ()
const gchar * | gexiv2_metadata_get_mime_type ()
gint | gexiv2_metadata_get_pixel_width ()
gint | gexiv2_metadata_get_pixel_height ()
gchar * | gexiv2_metadata_try_get_tag_string ()
gboolean | gexiv2_metadata_try_set_tag_string ()
gchar * | gexiv2_metadata_try_get_tag_interpreted_string ()
glong | gexiv2_metadata_try_get_tag_long ()
gboolean | gexiv2_metadata_try_set_tag_long ()
gchar ** | gexiv2_metadata_try_get_tag_multiple ()
gboolean | gexiv2_metadata_try_set_tag_multiple ()
GBytes * | gexiv2_metadata_try_get_tag_raw ()
gboolean | gexiv2_metadata_has_tag ()
gboolean | gexiv2_metadata_clear_tag ()
const gchar * | gexiv2_metadata_get_tag_label ()
const gchar * | gexiv2_metadata_get_tag_description ()
const gchar * | gexiv2_metadata_get_tag_type ()
gchar * | gexiv2_metadata_get_tag_string ()
gboolean | gexiv2_metadata_set_tag_string ()
gchar * | gexiv2_metadata_get_tag_interpreted_string ()
glong | gexiv2_metadata_get_tag_long ()
gboolean | gexiv2_metadata_set_tag_long ()
gchar ** | gexiv2_metadata_get_tag_multiple ()
gboolean | gexiv2_metadata_set_tag_multiple ()
GBytes * | gexiv2_metadata_get_tag_raw ()

## Types and Values

enum | GExiv2Orientation
enum | GExiv2StructureType
struct | GExiv2Metadata
enum | GExiv2ByteOrder

## Object Hierarchy

        GEnum
        ├── GExiv2ByteOrder
        ├── GExiv2Orientation
        ╰── GExiv2StructureType
        GObject
        ╰── GExiv2Metadata

## Includes

    #include <gexiv2/gexiv2.h>

## Description

GExiv2Metadata is a generic object that provides everything from simple aggregated accessors to common data such as image comments up to fine-grained access to specific tags of a specific format, be it EXIF, IPTC or XMP

## Functions

### gexiv2_metadata_new ()

    GExiv2Metadata *
    gexiv2_metadata_new (void);

#### Returns

A fully constructed GExiv2Metadata ready to be used.

[transfer full]

### gexiv2_metadata_free ()

    void
    gexiv2_metadata_free (GExiv2Metadata *self);

`gexiv2_metadata_free` has been deprecated since version 0.10.3 and should not be used in newly-written code.

Use `g_object_unref()` instead.

Destroys the GExiv2Metadata object and frees all associated memory.

#### Parameters

self | An instance of GExiv2Metadata |

### gexiv2_metadata_try_has_tag ()

    gboolean
    gexiv2_metadata_try_has_tag (GExiv2Metadata *self,
                                 const gchar *tag,
                                 GError **error);

The Exiv2 Tag Reference can be found at http://exiv2.org/metadata.html

#### Parameters

self | An instance of GExiv2Metadata |
tag | Exiv2 tag |
error | A return location for a GError or `NULL`. | [allow-none]

#### Returns

TRUE if the tag is present.

Since: 0.14.0

### gexiv2_metadata_try_clear_tag ()

    gboolean
    gexiv2_metadata_try_clear_tag (GExiv2Metadata *self,
                                   const gchar *tag,
                                   GError **error);

Removes the Exiv2 tag from the metadata object.

The Exiv2 Tag Reference can be found at http://exiv2.org/metadata.html

#### Parameters

self | An instance of GExiv2Metadata |
tag | Exiv2 tag |
error | A return location for a GError or `NULL`. | [allow-none]

#### Returns

TRUE if the tag was present.

Since: 0.14.0

### gexiv2_metadata_clear ()

    void
    gexiv2_metadata_clear (GExiv2Metadata *self);

Removes all tags for all domains (EXIF, IPTC, and XMP).

#### Parameters

self | An instance of GExiv2Metadata |

### gexiv2_metadata_try_get_tag_label ()

    const gchar *
    gexiv2_metadata_try_get_tag_label (const gchar *tag,
                                       GError **error);

The Exiv2 Tag Reference can be found at http://exiv2.org/metadata.html

#### Parameters

tag | An Exiv2 tag |
error | A return location for a GError or `NULL`. | [allow-none]

#### Returns

The tag's label.

[transfer none][allow-none]

Since: 0.12.2

### gexiv2_metadata_try_get_tag_description ()

    const gchar *
    gexiv2_metadata_try_get_tag_description
                                   (const gchar *tag,
                                    GError **error);

The Exiv2 Tag Reference can be found at http://exiv2.org/metadata.html

#### Parameters

tag | An Exiv2 tag |
error | A return location for a GError or `NULL`. | [allow-none]

#### Returns

The tag's description.

[transfer none][allow-none]

Since: 0.12.2

### gexiv2_metadata_try_get_tag_type ()

    const gchar *
    gexiv2_metadata_try_get_tag_type (const gchar *tag,
                                      GError **error);

The names of the various Exiv2 tag types can be found at Exiv2::TypeId,

http://exiv2.org/doc/namespaceExiv2.html#a5153319711f35fe81cbc13f4b852450c

The Exiv2 Tag Reference can be found at http://exiv2.org/metadata.html

#### Parameters

tag | An Exiv2 tag |
error | A return location for a GError or `NULL`. | [allow-none]

#### Returns

The tag's type name.

[transfer none][allow-none]

Since: 0.12.2

### gexiv2_metadata_try_tag_supports_multiple_values ()

    gboolean
    gexiv2_metadata_try_tag_supports_multiple_values
                                   (GExiv2Metadata *self,
                                    const gchar *tag,
                                    GError **error);

The Exiv2 Tag Reference can be found at https://www.exiv2.org/metadata.html

Multiple value tags are Xmp tags of type "XmpAlt", "XmpBag", "XmpSeq" or "LangAlt", or Iptc tags marked as Repeatable (which can be of any Iptc type). There are no multiple value Exif tags.

#### Parameters

self | An instance of GExiv2Metadata |
tag | An Exiv2 tag |
error | A return location for a GError or `NULL`. | [allow-none]

#### Returns

Whether `tag` is capable of storing multiple values or not. If `tag` is undefined (i.e. not built-in and not added to `self` ), then `error` is set and `FALSE` is returned.

Since: 0.14.0

### gexiv2_metadata_get_mime_type ()

    const gchar *
    gexiv2_metadata_get_mime_type (GExiv2Metadata *self);

Query mime type of currently loaded image.

#### Parameters

self | An instance of GExiv2Metadata |

#### Returns

The MIME type of the loaded image, `NULL` if not loaded or unknown.

[transfer none]

### gexiv2_metadata_get_pixel_width ()

    gint
    gexiv2_metadata_get_pixel_width (GExiv2Metadata *self);

Get the actual unoriented display width in pixels of the loaded image. May be different than the width reported by various metadata tags, i.e. "Exif.Photo.PixelXDimension".

#### Parameters

self | An instance of GExiv2Metadata |

#### Returns

Pixel width of current image

### gexiv2_metadata_get_pixel_height ()

    gint
    gexiv2_metadata_get_pixel_height (GExiv2Metadata *self);

Get the actual unoriented display height in pixels of the loaded image. This may be different than the height reported by various metadata tags, i.e. "Exif.Photo.PixelYDimension".

#### Parameters

self | An instance of GExiv2Metadata |

#### Returns

Pixel height of current image

### gexiv2_metadata_try_get_tag_string ()

    gchar *
    gexiv2_metadata_try_get_tag_string (GExiv2Metadata *self,
                                        const gchar *tag,
                                        GError **error);

The Exiv2 Tag Reference can be found at http://exiv2.org/metadata.html

Tags that support multiple values are returned as a single string, with elements separated by ", ".

#### Parameters

self | An instance of GExiv2Metadata |
tag | Exiv2 tag name |
error | A return location for a GError or `NULL`. | [allow-none]

#### Returns

The tag's value as a string.

[transfer full][allow-none]

Since: 0.12.2

### gexiv2_metadata_try_set_tag_string ()

    gboolean
    gexiv2_metadata_try_set_tag_string (GExiv2Metadata *self,
                                        const gchar *tag,
                                        const gchar *value,
                                        GError **error);

If a tag supports multiple values, then `value` is added to any existing values. For single tags, `value` replaces the value.

The Exiv2 Tag Reference can be found at http://exiv2.org/metadata.html

#### Parameters

self | An instance of GExiv2Metadata |
tag | Exiv2 tag name |
value | The value to set or replace the existing value |
error | A return location for a GError or `NULL`. | [allow-none]

#### Returns

TRUE on success

Since: 0.12.2

### gexiv2_metadata_try_get_tag_interpreted_string ()

    gchar *
    gexiv2_metadata_try_get_tag_interpreted_string
                                   (GExiv2Metadata *self,
                                    const gchar *tag,
                                    GError **error);

An interpreted string is one fit for user display. It may display units or use formatting appropriate to the type of data the tag holds.

Tags that support multiple values are returned as a single string, with elements separated by ", ".

The Exiv2 Tag Reference can be found at http://exiv2.org/metadata.html

#### Parameters

self | An instance of GExiv2Metadata |
tag | Exiv2 tag name |
error | A return location for a GError or `NULL`. | [allow-none]

#### Returns

The tag's interpreted value as a string.

[transfer full][allow-none]

Since: 0.12.2

### gexiv2_metadata_try_get_tag_long ()

    glong
    gexiv2_metadata_try_get_tag_long (GExiv2Metadata *self,
                                      const gchar *tag,
                                      GError **error);

The Exiv2 Tag Reference can be found at http://exiv2.org/metadata.html

#### Parameters

self | An instance of GExiv2Metadata |
tag | Exiv2 tag name |
error | A return location for a GError or `NULL`. | [allow-none]

#### Returns

The tag's value as a glong

Since: 0.12.2

### gexiv2_metadata_try_set_tag_long ()

    gboolean
    gexiv2_metadata_try_set_tag_long (GExiv2Metadata *self,
                                      const gchar *tag,
                                      glong value,
                                      GError **error);

The Exiv2 Tag Reference can be found at http://exiv2.org/metadata.html

#### Parameters

self | An instance of GExiv2Metadata |
tag | Exiv2 tag name |
value | The value to set or replace the existing value |
error | A return location for a GError or `NULL`. | [allow-none]

#### Returns

TRUE on success

Since: 0.12.2

### gexiv2_metadata_try_get_tag_multiple ()

    gchar **
    gexiv2_metadata_try_get_tag_multiple (GExiv2Metadata *self,
                                          const gchar *tag,
                                          GError **error);

The Exiv2 Tag Reference can be found at http://exiv2.org/metadata.html

#### Parameters

self | An instance of GExiv2Metadata |
tag | Exiv2 tag name |
error | A return location for a GError or `NULL`. | [allow-none]

#### Returns

The multiple string values of `tag` . Returns `NULL` if parameters are `NULL` or `tag` does not begin with recognised type of metadata ("Exif.", "Xmp." or "Iptc."). For a well formed `tag` , returns array[0] = `NULL` if `tag` is undefined or is not set in the current metadata.

[transfer full][allow-none][array zero-terminated=1]

Since: 0.12.2

### gexiv2_metadata_try_set_tag_multiple ()

    gboolean
    gexiv2_metadata_try_set_tag_multiple (GExiv2Metadata *self,
                                          const gchar *tag,
                                          const gchar **values,
                                          GError **error);

The Exiv2 Tag Reference can be found at http://exiv2.org/metadata.html

All previous `tag` values are erased. For multiple value tags, each of the non `NULL` entries in `values` is stored. For single value tags, only the last non `NULL` value is assigned.

#### Parameters

self | An instance of GExiv2Metadata |
tag | Exiv2 tag name |
values | An array of values to set or replace the existing value(s). | [array zero-terminated=1]
error | A return location for a GError or `NULL`. | [allow-none]

#### Returns

Boolean success value

Since: 0.12.2

### gexiv2_metadata_try_get_tag_raw ()

    GBytes *
    gexiv2_metadata_try_get_tag_raw (GExiv2Metadata *self,
                                     const gchar *tag,
                                     GError **error);

The Exiv2 Tag Reference can be found at http://exiv2.org/metadata.html

Tags that support multiple values may be returned as a single byte array, with records separated by 4x INFORMATION SEPARATOR FOUR (ASCII 0x1c)

#### Parameters

self | An instance of GExiv2Metadata |
tag | Exiv2 tag name |
error | A return location for a GError or `NULL`. | [allow-none]

#### Returns

The tag's raw value as a byte array.

[transfer full][allow-none]

Since: 0.12.2

### gexiv2_metadata_has_tag ()

    gboolean
    gexiv2_metadata_has_tag (GExiv2Metadata *self,
                             const gchar *tag);

`gexiv2_metadata_has_tag` has been deprecated since version 0.14.0 and should not be used in newly-written code.

Use `gexiv2_metadata_try_has_tag()` instead.

The Exiv2 Tag Reference can be found at http://exiv2.org/metadata.html

#### Parameters

self | An instance of GExiv2Metadata |
tag | Exiv2 tag |

#### Returns

TRUE if the tag is present.

### gexiv2_metadata_clear_tag ()

    gboolean
    gexiv2_metadata_clear_tag (GExiv2Metadata *self,
                               const gchar *tag);

`gexiv2_metadata_clear_tag` has been deprecated since version 0.14.0 and should not be used in newly-written code.

Use `gexiv2_metadata_try_clear_tag()` instead.

Removes the Exiv2 tag from the metadata object.

The Exiv2 Tag Reference can be found at http://exiv2.org/metadata.html

#### Parameters

self | An instance of GExiv2Metadata |
tag | Exiv2 tag |

#### Returns

TRUE if the tag was present.

### gexiv2_metadata_get_tag_label ()

    const gchar *
    gexiv2_metadata_get_tag_label (const gchar *tag);

`gexiv2_metadata_get_tag_label` has been deprecated since version 0.12.2 and should not be used in newly-written code.

Use `gexiv2_metadata_try_get_tag_label()` instead.

The Exiv2 Tag Reference can be found at http://exiv2.org/metadata.html

#### Parameters

tag | An Exiv2 tag |

#### Returns

The tag's label.

[transfer none][allow-none]

### gexiv2_metadata_get_tag_description ()

    const gchar *
    gexiv2_metadata_get_tag_description (const gchar *tag);

`gexiv2_metadata_get_tag_description` has been deprecated since version 0.12.2 and should not be used in newly-written code.

Use `gexiv2_metadata_try_get_tag_description()` instead.

The Exiv2 Tag Reference can be found at http://exiv2.org/metadata.html

#### Parameters

tag | An Exiv2 tag |

#### Returns

The tag's description.

[transfer none][allow-none]

### gexiv2_metadata_get_tag_type ()

    const gchar *
    gexiv2_metadata_get_tag_type (const gchar *tag);

`gexiv2_metadata_get_tag_type` has been deprecated since version 0.12.2 and should not be used in newly-written code.

Use `gexiv2_metadata_try_get_tag_type()` instead.

The names of the various Exiv2 tag types can be found at Exiv2::TypeId,

http://exiv2.org/doc/namespaceExiv2.html#a5153319711f35fe81cbc13f4b852450c

The Exiv2 Tag Reference can be found at http://exiv2.org/metadata.html

#### Parameters

tag | An Exiv2 tag |

#### Returns

The tag's type name.

[transfer none][allow-none]

### gexiv2_metadata_get_tag_string ()

    gchar *
    gexiv2_metadata_get_tag_string (GExiv2Metadata *self,
                                    const gchar *tag);

`gexiv2_metadata_get_tag_string` has been deprecated since version 0.12.2 and should not be used in newly-written code.

Use `gexiv2_metadata_try_get_tag_string()` instead.

The Exiv2 Tag Reference can be found at http://exiv2.org/metadata.html

Tags that support multiple values are returned as a single string, with elements separated by ", ".

In case of error, a GLib warning will be logged. Use instead `gexiv2_metadata_try_get_tag_string()` if you want to avoid this and control if and how the error is outputted.

#### Parameters

self | An instance of GExiv2Metadata |
tag | Exiv2 tag name |

#### Returns

The tag's value as a string.

[transfer full][allow-none]

### gexiv2_metadata_set_tag_string ()

    gboolean
    gexiv2_metadata_set_tag_string (GExiv2Metadata *self,
                                    const gchar *tag,
                                    const gchar *value);

`gexiv2_metadata_set_tag_string` has been deprecated since version 0.12.2 and should not be used in newly-written code.

Use `gexiv2_metadata_try_set_tag_string()` instead.

The Exiv2 Tag Reference can be found at http://exiv2.org/metadata.html

If a tag supports multiple values, then `value` is added to any existing values. For single value tags, `value` replaces the value.

In case of error, a GLib warning will be logged. Use instead `gexiv2_metadata_try_set_tag_string()` if you want to avoid this and control if and how the error is outputted.

#### Parameters

self | An instance of GExiv2Metadata |
tag | Exiv2 tag name |
value | The value to set or replace the existing value |

#### Returns

TRUE on success

### gexiv2_metadata_get_tag_interpreted_string ()

    gchar *
    gexiv2_metadata_get_tag_interpreted_string
                                   (GExiv2Metadata *self,
                                    const gchar *tag);

`gexiv2_metadata_get_tag_interpreted_string` has been deprecated since version 0.12.2 and should not be used in newly-written code.

Use `gexiv2_metadata_try_get_tag_interpreted_string()` instead.

An interpreted string is one fit for user display. It may display units or use formatting appropriate to the type of data the tag holds.

Tags that support multiple values are returned as a single string, with elements separated by ", ".

The Exiv2 Tag Reference can be found at http://exiv2.org/metadata.html

#### Parameters

self | An instance of GExiv2Metadata |
tag | Exiv2 tag name |

#### Returns

The tag's interpreted value as a string.

[transfer full][allow-none]

### gexiv2_metadata_get_tag_long ()

    glong
    gexiv2_metadata_get_tag_long (GExiv2Metadata *self,
                                  const gchar *tag);

`gexiv2_metadata_get_tag_long` has been deprecated since version 0.12.2 and should not be used in newly-written code.

Use `gexiv2_metadata_try_get_tag_long()` instead.

The Exiv2 Tag Reference can be found at http://exiv2.org/metadata.html

#### Parameters

self | An instance of GExiv2Metadata |
tag | Exiv2 tag name |

#### Returns

The tag's value as a glong

### gexiv2_metadata_set_tag_long ()

    gboolean
    gexiv2_metadata_set_tag_long (GExiv2Metadata *self,
                                  const gchar *tag,
                                  glong value);

`gexiv2_metadata_set_tag_long` has been deprecated since version 0.12.2 and should not be used in newly-written code.

Use `gexiv2_metadata_try_set_tag_long()` instead.

The Exiv2 Tag Reference can be found at http://exiv2.org/metadata.html

#### Parameters

self | An instance of GExiv2Metadata |
tag | Exiv2 tag name |
value | The value to set or replace the existing value |

#### Returns

TRUE on success

### gexiv2_metadata_get_tag_multiple ()

    gchar **
    gexiv2_metadata_get_tag_multiple (GExiv2Metadata *self,
                                      const gchar *tag);

`gexiv2_metadata_get_tag_multiple` has been deprecated since version 0.12.2 and should not be used in newly-written code.

Use `gexiv2_metadata_try_get_tag_multiple()` instead.

The Exiv2 Tag Reference can be found at http://exiv2.org/metadata.html

In case of error, a GLib warning will be logged. Use instead `gexiv2_metadata_try_get_tag_multiple()` if you want to avoid this and control if and how the error is outputted.

#### Parameters

self | An instance of GExiv2Metadata |
tag | Exiv2 tag name |

#### Returns

The multiple string values of the tag. Returns `NULL` if parameters are `NULL` or `tag` does not begin with recognised type of metadata ("Exif.", "Xmp." or "Iptc."). For a well formed `tag` , returns array[0] = `NULL` if `tag` is undefined or is not set in the current metadata. (Note: xmpText/langAlt bug is fixed in `gexiv2_metadata_try_get_tag_multiple()`).

[transfer full][allow-none][array zero-terminated=1]

### gexiv2_metadata_set_tag_multiple ()

    gboolean
    gexiv2_metadata_set_tag_multiple (GExiv2Metadata *self,
                                      const gchar *tag,
                                      const gchar **values);

`gexiv2_metadata_set_tag_multiple` has been deprecated since version 0.12.2 and should not be used in newly-written code.

Use `gexiv2_metadata_try_set_tag_multiple()` instead.

The Exiv2 Tag Reference can be found at http://exiv2.org/metadata.html

All previous `tag` values are erased. For multiple value tags, each of the non `NULL` entries in `values` is stored. For single value tags, only the last non `NULL` value is assigned.

In case of error, a GLib warning will be logged. Use instead `gexiv2_metadata_try_set_tag_multiple()` if you want to avoid this and control if and how the error is outputted.

#### Parameters

self | An instance of GExiv2Metadata |
tag | Exiv2 tag name |
values | An array of values to set or replace the existing value(s). | [array zero-terminated=1]

#### Returns

Boolean success value

### gexiv2_metadata_get_tag_raw ()

    GBytes *
    gexiv2_metadata_get_tag_raw (GExiv2Metadata *self,
                                 const gchar *tag);

`gexiv2_metadata_get_tag_raw` has been deprecated since version 0.12.2 and should not be used in newly-written code.

Use `gexiv2_metadata_try_get_tag_raw()` instead.

The Exiv2 Tag Reference can be found at http://exiv2.org/metadata.html

Tags that support multiple values may bereturned as a single byte array, with records separated by 4x INFORMATION SEPARATOR FOUR (ASCII 0x1c)

#### Parameters

self | An instance of GExiv2Metadata |
tag | Exiv2 tag name |

#### Returns

The tag's raw value as a byte array.

[transfer full][allow-none]

## Types and Values

### enum GExiv2Orientation

The orientation of an image is defined as the location of it's x,y origin. More than rotation, orientation allows for every variation of rotation, flips, and mirroring to be described in 3 bits of data.

A handy primer to orientation can be found at

http://jpegclub.org/exif_orientation.html

#### Members

GEXIV2_ORIENTATION_UNSPECIFIED | The orientation of the image is unknown |
GEXIV2_ORIENTATION_NORMAL | The orientation of the image is without any rotation. |
GEXIV2_ORIENTATION_HFLIP | The image is flipped on its horizontal axis |
GEXIV2_ORIENTATION_ROT_180 | The image is rotated by 180 degrees |
GEXIV2_ORIENTATION_VFLIP | The Image is flipped on its vertical axis |
GEXIV2_ORIENTATION_ROT_90_HFLIP | The image is rotated by 90 degrees clockwise and flipped on its horizontal axis |
GEXIV2_ORIENTATION_ROT_90 | The image is rotated by 90 degrees clockwise |
GEXIV2_ORIENTATION_ROT_90_VFLIP | The image is rotated by 90 degrees clockwise and flipped on its vertical axis |
GEXIV2_ORIENTATION_ROT_270 | The image is rotated 270 degrees clockwise |

### enum GExiv2StructureType

Used in `gexiv2_metadata_set_xmp_tag_struct()` to determine the array type

#### Members

GEXIV2_STRUCTURE_XA_NONE | Structure is not an array |
GEXIV2_STRUCTURE_XA_ALT | A list of alternative values |
GEXIV2_STRUCTURE_XA_BAG | An unordered list of values |
GEXIV2_STRUCTURE_XA_SEQ | An ordered list of values |
GEXIV2_STRUCTURE_XA_LANG | Not supported. For completeness only |

### struct GExiv2Metadata

    struct GExiv2Metadata;

An object holding all the Exiv2 metadata. Previews, if present, are also available.

As gexiv2 is only a wrapper around Exiv2, it's better to read its documentation to understand the full scope of what it offers: http://www.exiv2.org/

In particular, rather than providing a getter/setter method pair for every metadata value available for images (of which there are thousands), Exiv2 uses a dotted addressing scheme. For example, to access a photo's EXIF Orientation field, the caller passes to Exiv2 "Exif.Photo.Orientation". These tags (in Exiv2 parlance) are key to using Exiv2 (and therefore gexiv2) to its fullest.

A full reference for all supported Exiv2 tags can be found at

http://www.exiv2.org/metadata.html

### enum GExiv2ByteOrder

Options to control the byte order of binary EXIF data exports

#### Members

GEXIV2_BYTE_ORDER_LITTLE | Use little-endian byte order |
GEXIV2_BYTE_ORDER_BIG | Use big-endian byte order |