imageorient

Package imageorient provides image decoding functions similar to standard library’s
image.Decode and image.DecodeConfig with the addition that they also handle the
EXIF orientation tag (if present).

License: MIT.

See also: http://www.daveperrett.com/articles/2012/07/28/exif-orientation-handling-is-a-ghetto/

Install / Update

go get -u github.com/disintegration/imageorient

Documentation

http://godoc.org/github.com/disintegration/imageorient

Usage example

package main
import (
    "image/jpeg"
    "log"
    "os"
    "github.com/disintegration/imageorient"
)
func main() {
    // Open the test image. This particular image have the EXIF
    // orientation tag set to 3 (rotated by 180 deg).
    f, err := os.Open("testdata/orientation_3.jpg")
    if err != nil {
        log.Fatalf("os.Open failed: %v", err)
    }
    // Decode the test image using the imageorient.Decode function
    // to handle the image orientation correctly.
    img, _, err := imageorient.Decode(f)
    if err != nil {
        log.Fatalf("imageorient.Decode failed: %v", err)
    }
    // Save the decoded image to a new file. If we used image.Decode
    // instead of imageorient.Decode on the previous step, the saved
    // image would appear rotated.
    f, err = os.Create("testdata/example_output.jpg")
    if err != nil {
        log.Fatalf("os.Create failed: %v", err)
    }
    err = jpeg.Encode(f, img, nil)
    if err != nil {
        log.Fatalf("jpeg.Encode failed: %v", err)
    }
}