🎲 随机位图生成器（噪点 / 色块 BMP）Draw a Random BMP
生成一张随机位图：可选每像素彩色、灰度、黑白噪点或大色块马赛克；可设宽高、色块大小、黑色比例和随机种子（相同种子得到相同图片）。导出 24 位 BMP 或 PNG，适合做测试图、纹理底图和占位图，全部在浏览器本地完成。Generate a random bitmap: per-pixel colour, greyscale, black-and-white noise or a larger-cell mosaic. Set width, height, cell size, black ratio and an optional seed (the same seed always gives the same picture). Exports a 24-bit BMP or PNG — handy for test patterns, texture bases and placeholders; everything runs locally.
使用说明与常见问题How-to & FAQ
「随机位图生成器（噪点 / 色块 BMP）」是什么？What is the Draw a Random BMP tool?
生成一张随机位图：可选每像素彩色、灰度、黑白噪点或大色块马赛克；可设宽高、色块大小、黑色比例和随机种子（相同种子得到相同图片）。导出 24 位 BMP 或 PNG，适合做测试图、纹理底图和占位图，全部在浏览器本地完成。Generate a random bitmap: per-pixel colour, greyscale, black-and-white noise or a larger-cell mosaic. Set width, height, cell size, black ratio and an optional seed (the same seed always gives the same picture). Exports a 24-bit BMP or PNG — handy for test patterns, texture bases and placeholders; everything runs locally.
如何使用「随机位图生成器（噪点 / 色块 BMP）」？How do I use the Draw a Random BMP tool?
在「随机位图生成器（噪点 / 色块 BMP）」中，按需设置「宽度」、「高度」、「类型」、「色块大小」、「黑色比例 %」等选项，然后点击「生成」、「下载」按钮即可。In the Draw a Random BMP: Set "Width", "Height", "Type", "Cell size", "Black %", then click "Generate", "Download".
随机种子有什么用？What is the seed for?
填写任意文字或数字后，相同的宽高、类型和种子总会得到同一张图，方便复现测试图；留空则每次用浏览器的密码学随机数，结果都不同。With any text or number as the seed, the same size, type and seed always give the same picture — useful for reproducible test images. Leave it empty to use the browser's cryptographic RNG for a fresh result every time.
和“随机位图生成器”有什么区别？How is this different from Random Bitmap Generator?
功能相近；本工具默认导出 BMP，并支持可复现的种子和色块马赛克模式，和本站其他位图工具放在一起。Similar idea; this one defaults to BMP, adds a reproducible seed and a colour-block mosaic mode, and sits with the other bitmap tools.
有哪些选项可以调整？What options can I adjust?
「随机位图生成器（噪点 / 色块 BMP）」的设置：「宽度」默认 64，范围 1–2048；「高度」默认 64，范围 1–2048；「类型」可选 彩色像素、灰度像素、黑白噪点、彩色色块（默认 彩色像素）；「色块大小」默认 8，范围 1–256；「黑色比例 %」默认 50，范围 0–100；「种子（留空 = 真随机）」可留空；「格式」可选 BMP、PNG（默认 BMP）。改动任一选项后结果会按新设置重新生成。Settings in the Draw a Random BMP — "Width" default 64, range 1–2048; "Height" default 64, range 1–2048; "Type": Colour pixels, Greyscale, Black & white, Colour blocks (default Colour pixels); "Cell size" default 8, range 1–256; "Black %" default 50, range 0–100; "Seed (empty = true random)" optional; "Format": BMP, PNG (default BMP). Changing any option regenerates the result with the new setting.
「随机位图生成器（噪点 / 色块 BMP）」免费吗？需要注册吗？Is the Draw a Random BMP free? Do I need an account?
「随机位图生成器（噪点 / 色块 BMP）」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 Draw a Random BMP is completely free with no sign-up or install and works on phones and desktops; what you enter is processed only in your browser.