🧪 位图分色（拆分 BMP 的红、绿、蓝通道）Separate Bitmap Colours
把位图（BMP）或其他图片拆分成红、绿、蓝三个颜色通道：可以把三个通道并排放在一张图里对比，也可以只导出其中一个通道。每个通道可以显示成对应的颜色（只保留该通道的值），或者显示成灰度（通道值越大越亮，方便看出该颜色的分布），结果逐像素精确。也可以导出 CMY（青、品红、黄）分色。默认导出 24 位 BMP，也可以导出 PNG，支持批量，图片只在浏览器本地处理。Split a bitmap (BMP) or any other image into its red, green and blue channels: put all three side by side in one image to compare them, or export just one. Each channel can be shown in its own colour (only that channel kept) or as greyscale (brighter where the channel is stronger, to see how the colour is distributed), exactly pixel for pixel. CMY (cyan, magenta, yellow) separations are available too. The result is a 24-bit BMP by default, or PNG; works in bulk, and images are processed locally in your browser.
使用说明与常见问题How-to & FAQ
「位图分色（拆分 BMP 的红、绿、蓝通道）」是什么？What is the Separate Bitmap Colours tool?
把位图（BMP）或其他图片拆分成红、绿、蓝三个颜色通道：可以把三个通道并排放在一张图里对比，也可以只导出其中一个通道。每个通道可以显示成对应的颜色（只保留该通道的值），或者显示成灰度（通道值越大越亮，方便看出该颜色的分布），结果逐像素精确。也可以导出 CMY（青、品红、黄）分色。默认导出 24 位 BMP，也可以导出 PNG，支持批量，图片只在浏览器本地处理。Split a bitmap (BMP) or any other image into its red, green and blue channels: put all three side by side in one image to compare them, or export just one. Each channel can be shown in its own colour (only that channel kept) or as greyscale (brighter where the channel is stronger, to see how the colour is distributed), exactly pixel for pixel. CMY (cyan, magenta, yellow) separations are available too. The result is a 24-bit BMP by default, or PNG; works in bulk, and images are processed locally in your browser.
如何使用「位图分色（拆分 BMP 的红、绿、蓝通道）」？How do I use the Separate Bitmap Colours tool?
在「位图分色（拆分 BMP 的红、绿、蓝通道）」中，选择或拖入文件，按需设置「通道」、「显示方式」、「间距（像素）」、「输出格式」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 Separate Bitmap Colours: Choose or drop your files, set "Channels", "Show as", "Gap (px)", "Format", then click the Download button next to each result (with several files, "Download all (ZIP)" saves them together).
彩色显示和灰度显示有什么区别？What is the difference between In colour and Greyscale?
彩色显示时，红色通道图只保留红色值（绿、蓝为 0），看起来是不同深浅的红色；灰度显示时，把通道值直接当作亮度，值越大越白，更容易看清这种颜色在图片里的分布和强弱，这也是 Photoshop 通道面板的显示方式。In colour, the red-channel image keeps only the red values (green and blue set to 0), so it looks like shades of red. Greyscale uses the channel value as brightness — the higher the value, the whiter — which makes it easier to see where that colour is and how strong it is; it is how Photoshop's Channels panel shows them.
CMY 分色是什么？What are CMY separations?
CMY 是印刷用的减色模型：青 = 255 − 红、品红 = 255 − 绿、黄 = 255 − 蓝。彩色显示时每张图只用对应的油墨颜色表示用量，灰度显示时越黑表示需要的油墨越多，接近印刷分色片的效果（这里是简单换算，不含黑版 K 和印刷特性曲线）。CMY is the subtractive model used in printing: cyan = 255 − red, magenta = 255 − green and yellow = 255 − blue. In colour each image shows the amount of its ink in that ink's colour; in greyscale darker means more ink, much like printing separation films (a simple conversion with no black plate K or press curves).
导出的 BMP 是什么格式？What kind of BMP is produced?
默认导出 24 位不压缩 BMP（BITMAPINFOHEADER，自下而上存储），Windows 画图、Photoshop、GIMP、Python Pillow 和各种嵌入式工具都能直接打开。BMP 不支持透明，透明部分会填成白色并在结果里提示；需要保留透明请导出 PNG。By default a 24-bit uncompressed BMP (BITMAPINFOHEADER, stored bottom-up), which Windows Paint, Photoshop, GIMP, Python Pillow and embedded tools open directly. BMP has no transparency, so transparent areas are filled with white (the result says so); export PNG to keep transparency.
支持哪些图片？会上传吗？Which images work, and are they uploaded?
支持 JPG、PNG、WebP、GIF（静态或动图的第一帧）、BMP、AVIF、HEIC，以及浏览器能打开的 SVG；可一次拖入最多 50 张批量处理，单张最大 60 MB、1 亿像素；多张结果可打包成 ZIP 下载。所有处理都在你的浏览器里完成，图片不会上传，结果中也不会保留 EXIF 等元数据（包括拍摄位置）。JPG, PNG, WebP, GIF (a still or the first frame of an animation), BMP, AVIF, HEIC, and SVG that the browser can open. Drop in up to 50 images at once; each can be up to 60 MB and 100 megapixels, and several results can be downloaded as a ZIP. Everything happens in your browser: images are not uploaded, and EXIF and other metadata (including location) is not kept in the results.
「位图分色（拆分 BMP 的红、绿、蓝通道）」免费吗？需要注册吗？Is the Separate Bitmap Colours free? Do I need an account?
「位图分色（拆分 BMP 的红、绿、蓝通道）」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 Separate Bitmap Colours is completely free with no sign-up or install and works on phones and desktops; what you enter is processed only in your browser.