perkeep/third_party/github.com/rwcarlsen/goexif/README.md

goexif
======

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. 
Documentation can be found at http://godoc.org/github.com/rwcarlsen/goexif

Like goexif? - Bitcoin tips welcome: 17w65FVqx196Qp7tfCCSLqyvsHUhiEEa7P

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:

```go
package main

import (
  "os"
  "log"
  "fmt"

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

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

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

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

	camModel, _ := x.Get(exif.Model)
	date, _ := x.Get(exif.DateTimeOriginal)
	fmt.Println(camModel.StringVal())
	fmt.Println(date.StringVal())

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

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