🟩 绿幕抠图（去除绿色 / 蓝色背景）Remove Green Screen from Image

使用说明与常见问题How-to & FAQ

「绿幕抠图（去除绿色 / 蓝色背景）」是什么？What is the Remove Green Screen from Image tool?

去除照片里的绿幕（或蓝幕、任意纯色背景）：自动检测背景色，也可以在预览图上点选；可调容差和边缘柔和度，并去除人物边缘反射的绿色溢光；输出透明 PNG / WebP，或换成任意背景色。支持批量，图片只在浏览器本地处理，不会上传。Remove a green screen (or a blue screen or any solid backdrop) from photos. The backdrop colour is detected automatically or picked by clicking the preview, the tolerance and edge softness are adjustable, and green spill on the subject's edges is removed. Get a transparent PNG or WebP, or a new background colour. Works in bulk, and images are processed locally in your browser — nothing is uploaded.

如何使用「绿幕抠图（去除绿色 / 蓝色背景）」？How do I use the Remove Green Screen from Image tool?

在「绿幕抠图（去除绿色 / 蓝色背景）」中，选择或拖入文件，按需设置「要抠除的颜色」、「容差」、「边缘柔和」、「抠除后」、「新背景色」等选项，然后点击每个结果旁的「下载」按钮即可；有多个文件时也可以点「全部下载（ZIP）」一次打包下载。In the Remove Green Screen from Image: Choose or drop your files, set "Colour to remove", "Tolerance", "Edge softness", "Replace with", "New background", then click the Download button next to each result (with several files, "Download all (ZIP)" saves them together).

背景色是怎么自动检测的？How is the backdrop colour detected?

工具统计图片四条边上的像素，取出现最多的颜色作为背景色（绿幕照片的边缘几乎都是幕布），检测到的颜色会显示在“要抠除的颜色”里。如果主体碰到了边缘或检测不准，可以直接点击预览图上的幕布来选取，或手动选择颜色。The tool looks at the pixels along the four edges and takes the most common colour as the backdrop — in a green-screen photo the edges are nearly all screen — and shows it in Colour to remove. If the subject touches the edges or detection is off, click the screen in the preview to pick it, or choose the colour yourself.

容差、边缘柔和和溢色是什么？What are tolerance, edge softness and spill?

工具按色度（YCbCr 中的颜色成分，不受明暗影响）比较每个像素和背景色：差别在容差以内的完全变透明，在容差到“容差 + 柔和”之间的变成半透明，让头发等边缘更自然。绿幕会把绿光反射到人物边缘，“去除绿边溢色”会把边缘半透明像素中多出来的绿色压低，避免出现绿边；不透明的主体（包括绿色衣物）颜色不受影响。容差按背景色的鲜艳程度换算，主体穿着和幕布相近的绿色时，请调低容差。抠不干净就调高容差，主体被抠掉就调低。Each pixel is compared with the backdrop by chroma (the colour part of YCbCr, unaffected by brightness): within the tolerance it becomes fully transparent, and between the tolerance and tolerance + softness it becomes partly transparent so hair and edges look natural. A green screen reflects green light onto the subject, and Remove colour spill pulls the excess green out of semi-transparent edge pixels so there's no green fringe, while opaque parts of the subject (green clothing included) keep their colour. The tolerance scales with how saturated the backdrop is; if the subject wears a green close to the screen, lower it. Raise the tolerance if the screen isn't fully removed; lower it if parts of the subject disappear.

有哪些选项可以调整？What options can I adjust?

「绿幕抠图（去除绿色 / 蓝色背景）」的设置：「要抠除的颜色」默认 #00ff00；「容差」默认 35，范围 0–100；「边缘柔和」默认 20，范围 0–100；「抠除后」可选 透明、换成背景色（默认 透明）；「新背景色」默认 #ffffff；「输出格式」可选 PNG、WebP、JPG（默认 PNG）；「质量」默认 92，范围 40–100；可勾选：「自动检测背景色」（默认勾选）、「去除绿边溢色」（默认勾选）；可选文件：常见图片格式（含 HEIC、HEIF、AVIF、WEBP、BMP、JFIF）。改动任一选项后结果会按新设置重新生成。Settings in the Remove Green Screen from Image — "Colour to remove" default #00ff00; "Tolerance" default 35, range 0–100; "Edge softness" default 20, range 0–100; "Replace with": Transparent, New colour (default Transparent); "New background" default #ffffff; "Format": PNG, WebP, JPG (default PNG); "Quality" default 92, range 40–100; tick boxes: "Detect backdrop automatically" (on by default), "Remove colour spill" (on by default); files: common image formats (including HEIC, HEIF, AVIF, WEBP, BMP, JFIF). Changing…

图片会被上传到服务器吗？Are my images uploaded?

不会。「绿幕抠图（去除绿色 / 蓝色背景）」使用浏览器 Canvas 在本地处理图片，处理后的文件直接从你的浏览器下载。No. The Remove Green Screen from Image processes images locally with the browser Canvas API and the result downloads straight from your browser.

「绿幕抠图（去除绿色 / 蓝色背景）」免费吗？需要注册吗？Is the Remove Green Screen from Image free? Do I need an account?

「绿幕抠图（去除绿色 / 蓝色背景）」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 Remove Green Screen from Image is completely free with no sign-up or install and works on phones and desktops; what you enter is processed only in your browser.