📷 DNG 转 JPG（Adobe 数字负片 RAW）DNG to JPG Converter

使用说明与常见问题How-to & FAQ

「DNG 转 JPG（Adobe 数字负片 RAW）」是什么？What is the DNG to JPG Converter tool?

把 DNG（Adobe 数字负片）RAW 照片转换为 JPG，适用于徕卡、宾得、理光、大疆和手机拍的 DNG：在浏览器中用 LibRaw 完整解码（去马赛克、白平衡、相机色彩矩阵），可选相机白平衡或自动白平衡、可调质量和半尺寸快速模式，多张打包 ZIP，文件不上传。Convert DNG (Adobe Digital Negative) RAW photos to JPG — from Leica, Pentax, Ricoh, DJI and phone cameras alike. Each file is fully decoded in your browser with LibRaw (demosaicing, white balance, camera colour matrix), with as-shot or auto white balance, adjustable quality, a half-size fast mode and ZIP download — nothing is uploaded.

如何使用「DNG 转 JPG（Adobe 数字负片 RAW）」？How do I use the DNG to JPG Converter tool?

在「DNG 转 JPG（Adobe 数字负片 RAW）」中，选择或拖入文件，按需设置「质量」、「白平衡」等选项，然后点击「全部下载（ZIP）」按钮即可。In the DNG to JPG Converter: Choose or drop your files, set "Quality", "White balance", then click "Download all (ZIP)".

是怎么转换的？会不会只是取出内嵌的预览图？How is it converted — is it just the embedded preview?

不是取预览图。文件在浏览器中用开源的 LibRaw（libraw-wasm 构建，LibRaw 采用 LGPL-2.1/CDDL-1.0 双许可）完整解码：读取传感器原始数据，做去马赛克插值（AHD）、白平衡和相机色彩矩阵转换，输出 8 位 sRGB，再用浏览器编码为 JPG。No. The file is fully decoded in your browser with the open-source LibRaw (the libraw-wasm build; LibRaw is dual-licensed LGPL-2.1 / CDDL-1.0): the raw sensor data is demosaiced (AHD), white-balanced and converted with the camera colour matrix to 8-bit sRGB, then encoded to JPG by the browser.

颜色为什么和相机直出 JPG 或 Lightroom 不一样？Why do colours differ from the camera JPG or Lightroom?

相机直出 JPG 和修图软件会套用各自的照片风格、色调曲线、镜头校正、降噪和锐化；这里只做 LibRaw 的标准解码（含自动亮度），不做镜头校正、降噪或锐化，所以对比度和色彩会有差异，属于正常现象。白平衡默认使用相机记录的数值，也可以改为自动白平衡。The camera's JPG engine and editing apps apply their own picture styles, tone curves, lens corrections, noise reduction and sharpening. This tool does LibRaw's standard decode (with auto brightness) and no lens correction, noise reduction or sharpening, so contrast and colour will differ — that is expected. White balance uses the camera's recorded values by default; you can switch to auto.

为什么比较慢？“半尺寸快速模式”是什么？Why is it slow, and what is half-size mode?

第一次使用时需要下载约 1.5 MB 的解码组件；2000 万像素以上的 RAW 解码通常需要几秒到十几秒。勾选“半尺寸快速模式”后宽和高各减半（像素数为四分之一），速度快很多，适合预览和网络分享。单个文件最大 200 MB，全尺寸输出最大 1 亿像素。The decoder (about 1.5 MB) downloads on first use, and RAWs above 20 MP usually take a few seconds to over ten seconds to decode. Half-size fast mode halves the width and height (a quarter of the pixels) and is much faster — good for previews and sharing. Each file can be up to 200 MB, and full-size output up to 100 MP.

支持哪些 DNG？EXIF 信息会保留吗？Which DNGs work, and is EXIF kept?

DNG 是 Adobe 公布的开放 RAW 格式，徕卡、宾得、理光、哈苏、大疆无人机以及谷歌、三星、苹果等手机都用它，Lightroom 的“转换为 DNG”也会生成它。LibRaw 能解码大多数无损压缩和未压缩的 DNG，包括已经去马赛克的线性 DNG；较新的特殊编码（例如 DNG 1.7 的 JPEG XL 压缩或部分手机的有损 DNG）可能解码失败，会直接提示。输出的 JPG 由浏览器 Canvas 编码，不包含 EXIF（拍摄参数、GPS 等），结果中会显示识别到的相机型号和尺寸。DNG is Adobe's open RAW format, used by Leica, Pentax, Ricoh, Hasselblad, DJI drones and phones from Google, Samsung, Apple and others — and Lightroom's Convert to DNG writes it too. LibRaw decodes most losslessly compressed and uncompressed DNGs, including already-demosaiced linear DNGs; newer special encodings (such as DNG 1.7 JPEG XL compression or some phones' lossy DNGs) may fail, and you'll be told. The JPG is encoded by the browser's Canvas and carries no EXIF (shooting data, GPS); the result shows the detected camera and size.

文件会上传吗？Are files uploaded?

不会。DNG 文件在你的浏览器里解码和编码，不会离开你的设备。No. The DNG file is decoded and encoded in your browser and never leaves your device.

「DNG 转 JPG（Adobe 数字负片 RAW）」免费吗？需要注册吗？Is the DNG to JPG Converter free? Do I need an account?

「DNG 转 JPG（Adobe 数字负片 RAW）」完全免费，无需注册或安装，打开网页即可使用，手机和电脑都能用；输入的内容只在你的浏览器本地处理。The DNG to JPG Converter is completely free with no sign-up or install and works on phones and desktops; what you enter is processed only in your browser.