请推荐用于将IPTC数据写入图像的Node模块吗?

问题描述

我有一个Node.js服务器，它的工作是下载JPEG图像，将某些数据写入几个IPTC字段(例如 Iptc.Application2.Caption )，然后将图像传递给另一个服务.

I have a Node.js server whose job it is to download JPEG images, write certain data to a couple of IPTC fields (e.g. Iptc.Application2.Caption) and pass the image on to another service.

理想情况下，我想将IPTC数据写入内存中的缓冲区(而不是将映像写入本地文件系统).失败的话，我可以使用一种解决方案，在该解决方案中下载，将文件存储到FS，然后应用IPTC数据.

Ideally, I'd like to write the IPTC data to the in-memory buffer (without writing the image to the local file system). Failing that, I can live with a solution where I download, store the file to the FS, then apply the IPTC data.

我已经与 https://github.com/dberesford/exiv2node 一起使用了，但不适用于Node.js v10.而且它依赖于 exiv2 C ++库，这使得运行容器化变得很混乱.

I've got this working with https://github.com/dberesford/exiv2node, but it doesn't work on Node.js v10. And it depends on exiv2 C++ library which makes it messy to run containerized.

所以我的问题是:是否有一个不错的Node.js模块可以启用IPTC数据写入，并且不依赖于某些怪物C库?

So my question is: Is there a decent Node.js module which enables IPTC data write, and does not depend on some monster C library?

推荐答案

我会使用 exiftool-vendored，它只是 exiftool命令行实用程序的包装.它还将安装exiftool二进制文件，如果您已经安装了exiftool，则可以使用不带该二进制文件的 exiftool

I would use exiftool-vendored, that it just a wrapper for the exiftool command line utility. It will also install the exiftool binary, if you have already installed exiftool you can use exiftool without this binary

安装exiftool:

Install exiftool:

npm install --save exiftool-vendored

您添加的标签将放入支持它们的规范中，在本例中为IPTC.

The tags you add are put in the specifications that supports them, in this case IPTC.

例如，我将添加 Artist 和 Copyright 标签，而exiftool将放置相应的IPTC标签.

For example I will add Artist and Copyright tags, and exiftool will put the correspondent IPTC tags.

const exiftool = require("exiftool-vendored").exiftool

const tags = {
  artist:"David Lemon",
  copyright:"2018 David Lemon"
};
exiftool.write("outernet.jpeg", tags);

exiftool.write 将返回一个承诺，您可以在计算其他内容时等待.有关承诺的更多信息

exiftool.write will return a promise that you can wait for while computing another things. More info on promises.

使用exiftool CLI，您可以检查标签是否正确写入文件:

Using the exiftool CLI you can check that the tags are well written to the file:

$ node_modules/exiftool-vendored.exe/bin/exiftool.exe outernet.jpeg
ExifTool Version Number         : 11.20
File Name                       : outernet.jpeg
Directory                       : .
File Size                       : 4.6 kB
[...]
Artist                          : David Lemon
Y Cb Cr Positioning             : Centered
Copyright                       : 2018 David Lemon
Current IPTC Digest             : 2b3df19b0c67788262a0d0dced3b6d58
Coded Character Set             : UTF8
Envelope Record Version         : 4
[...]

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