orient

Documentation

Overview

Package orient provides the Orient function that applies an Exif orientation to an image.

Index

• func IsTranspose(o int) bool
• func Orient(im image.Image, o int) image.Image

Functions

func IsTranspose

func IsTranspose(o int) bool

IsTranspose reports if the Exif orientation o requires a transpose operation that swaps the x and y dimensions of the image.

In other words, it returns true iff o represents either rotation by ±90° or a transpose/transverse operation.

func Orient

func Orient(im image.Image, o int) image.Image

Orient changes the orientation of im based on the Exif orientation value.

It performes the following operation based on o:

2: flip horizontal
3: rotate 180°
4: flip vertical
5: transpose
6: rotate 90°
7: transverse (transpose and rotate 180°)
8: rotate 270°

It will return either a new image for the values of o above, or im istelf otherwise.