xexif

handle EXIF of jpg/jpeg, based on Exif2.31 2016

Install

npm install xexif

Usage

    var xexif = require("xexif")

1. load jpg/jpeg image file, return a arrayBuffer

    var app1ArrayBuf = xexif.getArrayBufFromImgFile("./1.jpg")  

2. decode APP1(thigs include EXIF) to a stage-0 Dict,but this raw-data-dict is not good for reading/writing

    var app1s0 = xexif.decodeAPP1(app1ArrayBuf)

3. convert Dict of step3 to a more readable stage-1 Dict

    var app1s1 = xexif.readable(app1s0)    

4.search a tag(loose mode)

    xexif.search("GPS",app1s1)

5.get a tag via a exact tagName ,which could be find in step 4

    xexif.get("GPSImgDirection",app1s1)

Doc Help Man

6.doc for help and guide

6.1 the APP1 SEG structure

    xexif.listStructure()

6.2 list all exif tags documented in DC-008-Translation-2016-E

    xexif.listExifTags()

6.3 explaination of the tag “Orientation”

    xexif.man("Orientation")

STANDARDS

(Exchangeable image file format for digital still cameras: Exif Version 2.31 )

Exif 2.31

PACKAGE DEPENDANY

(optional)

iconv-lite

CODE REFERENCE

(thanks to these two great projects)

1. ExifTool by Phil Harvey
2. exif-js

SOFTWARE REFERENCE

MagicEXIF

USEAGE SCREENSHOOTS

    var xexif = require("xexif")
    var app1ArrayBuf = xexif.getArrayBufFromImgFile("./1.jpg")
    var app1s0 = xexif.decodeAPP1(app1ArrayBuf)
    var app1s1 = xexif.readable(app1s0)
    app1s1

    xexif.search("GPS",app1s1)
    xexif.get("GPSImgDirection",app1s1)

    xexif.listStructure()

    xexif.listExifTags()

    xexif.man("Orientation")

TODO

1.write exif

2.encoder

3.MakerNote