goexif

by rwcarlsen

rwcarlsen / goexif

Decode embedded EXIF meta data from image files.

450 Stars 105 Forks Last release: Not found BSD 2-Clause "Simplified" License 148 Commits 0 Releases

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goexif

GoDoc

Provides decoding of basic exif and tiff encoded data. Still in alpha - no guarantees. Suggestions and pull requests are welcome. Functionality is split into two packages - "exif" and "tiff" The exif package depends on the tiff package.

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To install, in a terminal type:

go get github.com/rwcarlsen/goexif/exif

Or if you just want the tiff package:

go get github.com/rwcarlsen/goexif/tiff

Example usage:

package main

import ( "fmt" "log" "os"

"github.com/rwcarlsen/goexif/exif"
"github.com/rwcarlsen/goexif/mknote"

)

func ExampleDecode() { fname := "sample1.jpg"

f, err := os.Open(fname)
if err != nil {
    log.Fatal(err)
}

// Optionally register camera makenote data parsing - currently Nikon and
// Canon are supported.
exif.RegisterParsers(mknote.All...)

x, err := exif.Decode(f)
if err != nil {
    log.Fatal(err)
}

camModel, _ := x.Get(exif.Model) // normally, don't ignore errors!
fmt.Println(camModel.StringVal())

focal, _ := x.Get(exif.FocalLength)
numer, denom, _ := focal.Rat2(0) // retrieve first (only) rat. value
fmt.Printf("%v/%v", numer, denom)

// Two convenience functions exist for date/time taken and GPS coords:
tm, _ := x.DateTime()
fmt.Println("Taken: ", tm)

lat, long, _ := x.LatLong()
fmt.Println("lat, long: ", lat, ", ", long)

}

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