如何在不加载图像的情况下为文件系统上的现有图像编写或修改EXIF数据？ [英] How to write or modify EXIF data for an existing image on the filesystem, without loading the image?

问题描述

之前我曾问过类似的问题，但没有收到明确的答案。似乎必须有一种方法可以简单地向图像添加/修改元数据，而无需将图像加载到内存中，而无需直接读取位。

I've asked similar questions before, but have not received a definitive answer. Seems that there must be a way to simply add/modify metadata to an image without loading the image into memory, without having to deal with directly reading bits.

似乎有点像使用 CMSampleBufferRef 时存在，但我需要能够将已保存到磁盘的常规图像执行此操作。

例如，给定一个大 png 在 /Documents/photo.png ，我想修改其exif元数据而不必加载该图像。

Seems like ways exist when using CMSampleBufferRefs, but I need to be able to do this with a regular image already saved to disk.
For instance, given a very large png at /Documents/photo.png, I want to modify its exif metadata without having to load that image.

推荐答案

你可以使用libexif - 之前我已成功为iOS编译它。使用libexif，您可以修改任何图像的EXIF元数据。

You can use libexif - I've had success with compiling it for iOS before. With libexif, you can modify any image's EXIF metadata.

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