Struct Tag

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pub struct Tag(pub Context, pub u16);

Expand description

A tag of a TIFF/Exif field.

Some well-known tags are provided as associated constants of this type. The constant names follow the Exif specification but not the Rust naming conventions.

A non-predefined tag can also be specified by the context and the number as in Tag(Context::Tiff, 0x100).

Tuple Fields§

§0: Context§1: u16

Implementations§

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impl Tag

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pub fn context(self) -> Context

Returns the context of the tag.

§Examples

use exif::{Context, Tag};
assert_eq!(Tag::XResolution.context(), Context::Tiff);
assert_eq!(Tag::DateTimeOriginal.context(), Context::Exif);

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pub fn number(self) -> u16

Returns the tag number.

§Examples

use exif::Tag;
assert_eq!(Tag::XResolution.number(), 0x11a);
assert_eq!(Tag::DateTimeOriginal.number(), 0x9003);

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pub fn description(&self) -> Option<&str>

Returns the description of the tag.

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pub fn default_value(&self) -> Option<Value>

Returns the default value of the tag. None is returned if it is not defined in the standard or it depends on another tag.

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pub const Make: Tag

Manufacturer of the image input equipment.

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pub const Model: Tag

Model name or number of the image input equipment.

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pub const StripOffsets: Tag

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pub const Orientation: Tag

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pub const SamplesPerPixel: Tag

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pub const RowsPerStrip: Tag

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pub const StripByteCounts: Tag

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pub const XResolution: Tag

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pub const YResolution: Tag

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pub const PlanarConfiguration: Tag

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pub const ResolutionUnit: Tag

Unit of XResolution and YResolution fields.

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pub const TransferFunction: Tag

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pub const Software: Tag

Name and version of the software used to create the image.

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pub const DateTime: Tag

Date and time when the image file was created or last edited. For the time when the picture was taken, see DateTimeOriginal field.

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pub const Artist: Tag

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pub const WhitePoint: Tag

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pub const PrimaryChromaticities: Tag

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pub const TileOffsets: Tag

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pub const TileByteCounts: Tag

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pub const JPEGInterchangeFormat: Tag

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pub const JPEGInterchangeFormatLength: Tag

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pub const YCbCrCoefficients: Tag

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pub const YCbCrSubSampling: Tag

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pub const YCbCrPositioning: Tag

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pub const ReferenceBlackWhite: Tag

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pub const Copyright: Tag

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pub const ExposureTime: Tag

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pub const FNumber: Tag

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pub const ExposureProgram: Tag

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pub const SpectralSensitivity: Tag

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pub const PhotographicSensitivity: Tag

Sensitivity of the device.

The value may be represented by standard output sensitivity (SOS), recommended exposure index (REI), or ISO speed. What is stored is designated by SensitivityType field.

This field is 16-bit and may be saturated. For 32-bit values, see StandardOutputSensitivity, RecommendedExposureIndex, ISOSpeed, ISOSpeedLatitudeyyy, and ISOSpeedLatitudezzz fields.

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pub const OECF: Tag

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pub const SensitivityType: Tag

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pub const StandardOutputSensitivity: Tag

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pub const RecommendedExposureIndex: Tag

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pub const ISOSpeed: Tag

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pub const ISOSpeedLatitudeyyy: Tag

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pub const ISOSpeedLatitudezzz: Tag

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pub const ExifVersion: Tag

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pub const DateTimeOriginal: Tag

Date and time when the original image was generated (e.g., the picture was taken by a camera).

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pub const DateTimeDigitized: Tag

Date and time when the image was stored as digital data. If a picture is taken by a film camera and then digitized later, this value will be different from DateTimeOriginal field.

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