From 120e00b1889153dd4bcbdb89e0c16b2aeaffd6e9 Mon Sep 17 00:00:00 2001 From: WJZ_P <110795301+WJZ-P@users.noreply.github.com> Date: Sat, 21 Mar 2026 20:34:03 +0800 Subject: [PATCH] =?UTF-8?q?feat(gemini-ops):=20=E6=96=B0=E5=A2=9E=E5=9B=BE?= =?UTF-8?q?=E7=89=87=E5=8E=BB=E6=B0=B4=E5=8D=B0=E5=8A=9F=E8=83=BD=EF=BC=8C?= =?UTF-8?q?=E6=94=AF=E6=8C=81=E6=96=87=E4=BB=B6=E5=92=8C=20base64=20?= =?UTF-8?q?=E6=95=B0=E6=8D=AE=E5=A4=84=E7=90=86?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- package-lock.json | 531 ++++++++++++++++++++++++++++++++++++++- package.json | 3 +- src/assets/bg_48.png | Bin 0 -> 1677 bytes src/assets/bg_96.png | Bin 0 -> 8165 bytes src/gemini-ops.js | 23 ++ src/watermark-remover.js | 287 +++++++++++++++++++++ 6 files changed, 842 insertions(+), 2 deletions(-) create mode 100644 src/assets/bg_48.png create mode 100644 src/assets/bg_96.png create mode 100644 src/watermark-remover.js diff --git a/package-lock.json 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zC+wgM>Gbrp2GGCz?Qf|qD)9t@DFDHsoCIDH1t7MI#i+9EP{UGu2?9fM1uIdK>YR5j z8%U4M;)r~mU1e?a0l~~Tqr#^I@;_d3kCr1=OPj3B?GyG|9AB?Et>23;&VTZgC(A!9 z&(F`F{N%~%Xi^)9|rJm!JFR)Xd*1I00000 LNkvXXu0mjfkxT%s literal 0 HcmV?d00001 diff --git a/src/gemini-ops.js b/src/gemini-ops.js index a3633a8..2354553 100644 --- a/src/gemini-ops.js +++ b/src/gemini-ops.js @@ -9,6 +9,7 @@ import { createOperator } from './operator.js'; import { sleep } from './util.js'; import config from './config.js'; import { mkdirSync } from 'node:fs'; +import { removeWatermarkFromFile, removeWatermarkFromDataUrl } from './watermark-remover.js'; // ── Gemini 页面元素选择器 ── const SELECTORS = { @@ -658,6 +659,18 @@ export function createOps(page) { const dataUrl = `data:${mime};base64,${base64Full}`; console.log(`[extractImageBase64] ✅ CDP 提取成功 (mime=${mime}, size=${(base64Full.length * 0.75 / 1024).toFixed(1)}KB)`); + + // 去水印处理 + const wmResult = await removeWatermarkFromDataUrl(dataUrl); + if (wmResult.ok && !wmResult.skipped) { + console.log(`[extractImageBase64] 🍌 水印已移除 (${wmResult.width}×${wmResult.height}, logo=${wmResult.logoSize}px)`); + return { ok: true, dataUrl: wmResult.dataUrl, method: 'cdp' }; + } else if (wmResult.skipped) { + console.log(`[extractImageBase64] 跳过去水印: ${wmResult.reason}`); + } else { + console.warn(`[extractImageBase64] 去水印失败（不影响提取结果）: ${wmResult.error}`); + } + return { ok: true, dataUrl, method: 'cdp' }; } catch (err) { const errMsg = err.message || String(err); @@ -833,6 +846,16 @@ export function createOps(page) { } } + // 去水印处理 + const wmResult = await removeWatermarkFromFile(filePath); + if (wmResult.ok && !wmResult.skipped) { + console.log(`[ops] 水印已移除 (${wmResult.width}×${wmResult.height}, logo=${wmResult.logoSize}px)`); + } else if (wmResult.skipped) { + console.log(`[ops] 跳过去水印: ${wmResult.reason}`); + } else { + console.warn(`[ops] 去水印失败（不影响下载结果）: ${wmResult.error}`); + } + return { ok: true, filePath, diff --git a/src/watermark-remover.js b/src/watermark-remover.js new file mode 100644 index 0000000..10eed68 --- /dev/null +++ b/src/watermark-remover.js @@ -0,0 +1,287 @@ +/** + * watermark-remover.js — Gemini 图片水印移除 + * + * 基于反向 Alpha 混合算法，精确还原被 Gemini 添加水印的图片。 + * + * 算法移植自 gemini-watermark-remover（by journey-ad / Jad） + * 原始仓库：https://github.com/journey-ad/gemini-watermark-remover + * 许可证：MIT - Copyright (c) 2025 Jad + * + * 原理： + * Gemini 水印叠加公式: watermarked = α × 255 + (1 - α) × original + * 反向求解: original = (watermarked - α × 255) / (1 - α) + */ +import sharp from 'sharp'; +import { readFileSync } from 'node:fs'; +import { join, dirname } from 'node:path'; +import { fileURLToPath } from 'node:url'; + +const __dirname = dirname(fileURLToPath(import.meta.url)); + +// ── 常量 ── +const ALPHA_THRESHOLD = 0.002; // 忽略极小的 alpha 值（噪声） +const MAX_ALPHA = 0.99; // 避免除以接近零的值 +const LOGO_VALUE = 255; // 白色水印的颜色值 + +// ── Alpha Map 缓存 ── +const alphaMapCache = {}; + +/** + * 从水印背景捕获图中计算 Alpha Map + * @param {Buffer} pngBuffer - 水印背景捕获图的 PNG 数据 + * @param {number} size - 水印尺寸（48 或 96） + * @returns {Promise} alpha 值数组（0.0 ~ 1.0） + */ +async function calculateAlphaMap(pngBuffer, size) { + const { data, info } = await sharp(pngBuffer) + .resize(size, size) + .raw() + .ensureAlpha() + .toBuffer({ resolveWithObject: true }); + + const pixelCount = info.width * info.height; + const alphaMap = new Float32Array(pixelCount); + const channels = info.channels; // 4 (RGBA) + + for (let i = 0; i < pixelCount; i++) { + const idx = i * channels; + const r = data[idx]; + const g = data[idx + 1]; + const b = data[idx + 2]; + // 取 RGB 三通道最大值归一化 + alphaMap[i] = Math.max(r, g, b) / 255.0; + } + + return alphaMap; +} + +/** + * 获取指定尺寸的 Alpha Map（带缓存） + * @param {number} size - 48 或 96 + * @returns {Promise} + */ +async function getAlphaMap(size) { + if (alphaMapCache[size]) return alphaMapCache[size]; + + const bgFile = size === 48 ? 'bg_48.png' : 'bg_96.png'; + const bgPath = join(__dirname, 'assets', bgFile); + const bgBuffer = readFileSync(bgPath); + + const alphaMap = await calculateAlphaMap(bgBuffer, size); + alphaMapCache[size] = alphaMap; + return alphaMap; +} + +/** + * 根据图片尺寸检测水印配置 + * @param {number} width - 图片宽度 + * @param {number} height - 图片高度 + * @returns {{ logoSize: number, marginRight: number, marginBottom: number }} + */ +function detectWatermarkConfig(width, height) { + // Gemini 规则：宽高都 > 1024 用 96×96，否则用 48×48 + if (width > 1024 && height > 1024) { + return { logoSize: 96, marginRight: 64, marginBottom: 64 }; + } + return { logoSize: 48, marginRight: 32, marginBottom: 32 }; +} + +/** + * 计算水印在图片中的位置（固定右下角） + * @param {number} imgWidth + * @param {number} imgHeight + * @param {{ logoSize: number, marginRight: number, marginBottom: number }} config + * @returns {{ x: number, y: number, width: number, height: number }} + */ +function calculateWatermarkPosition(imgWidth, imgHeight, config) { + const { logoSize, marginRight, marginBottom } = config; + return { + x: imgWidth - marginRight - logoSize, + y: imgHeight - marginBottom - logoSize, + width: logoSize, + height: logoSize, + }; +} + +/** + * 对原始像素数据执行反向 Alpha 混合，移除水印 + * + * @param {Buffer} pixels - RGBA 原始像素 Buffer（会被原地修改） + * @param {number} imgWidth - 图片宽度 + * @param {Float32Array} alphaMap - Alpha 通道数据 + * @param {{ x: number, y: number, width: number, height: number }} position - 水印位置 + */ +function removeWatermarkPixels(pixels, imgWidth, alphaMap, position) { + const { x, y, width, height } = position; + + for (let row = 0; row < height; row++) { + for (let col = 0; col < width; col++) { + const imgIdx = ((y + row) * imgWidth + (x + col)) * 4; + const alphaIdx = row * width + col; + + let alpha = alphaMap[alphaIdx]; + + // 跳过噪声 + if (alpha < ALPHA_THRESHOLD) continue; + + // 限制 alpha 避免除零 + alpha = Math.min(alpha, MAX_ALPHA); + const oneMinusAlpha = 1.0 - alpha; + + // 对 R / G / B 三通道分别反向混合 + for (let c = 0; c < 3; c++) { + const watermarked = pixels[imgIdx + c]; + const original = (watermarked - alpha * LOGO_VALUE) / oneMinusAlpha; + pixels[imgIdx + c] = Math.max(0, Math.min(255, Math.round(original))); + } + // Alpha 通道不动 + } + } +} + +/** + * 移除图片文件中的 Gemini 水印并覆盖保存 + * + * @param {string} filePath - 图片文件路径（会被原地覆盖） + * @returns {Promise<{ ok: boolean, width?: number, height?: number, logoSize?: number, error?: string }>} + */ +export async function removeWatermarkFromFile(filePath) { + try { + console.log(`[watermark-remover] 开始处理: ${filePath}`); + + // 1. 读取图片原始像素 + const image = sharp(filePath); + const metadata = await image.metadata(); + const { width, height } = metadata; + + if (!width || !height) { + return { ok: false, error: 'invalid_image_metadata' }; + } + + // 2. 检测水印配置 + const config = detectWatermarkConfig(width, height); + const position = calculateWatermarkPosition(width, height, config); + + // 校验水印位置合法性 + if (position.x < 0 || position.y < 0) { + console.log(`[watermark-remover] 图片太小（${width}×${height}），跳过去水印`); + return { ok: true, width, height, skipped: true, reason: 'image_too_small' }; + } + + // 3. 获取 Alpha Map + const alphaMap = await getAlphaMap(config.logoSize); + + // 4. 提取原始像素、执行反向混合 + const { data: pixels, info } = await sharp(filePath) + .raw() + .ensureAlpha() + .toBuffer({ resolveWithObject: true }); + + removeWatermarkPixels(pixels, info.width, alphaMap, position); + + // 5. 写回文件（保持原格式） + const ext = (filePath.match(/\.(\w+)$/)?.[1] || 'png').toLowerCase(); + let outputPipeline = sharp(pixels, { + raw: { width: info.width, height: info.height, channels: info.channels }, + }); + + switch (ext) { + case 'jpg': + case 'jpeg': + outputPipeline = outputPipeline.jpeg({ quality: 95 }); + break; + case 'webp': + outputPipeline = outputPipeline.webp({ quality: 95 }); + break; + default: + outputPipeline = outputPipeline.png(); + break; + } + + await outputPipeline.toFile(filePath); + + console.log(`[watermark-remover] ✅ 去水印完成: ${width}×${height}, logo=${config.logoSize}px`); + return { ok: true, width, height, logoSize: config.logoSize }; + } catch (err) { + console.error(`[watermark-remover] ❌ 去水印失败: ${err.message}`); + return { ok: false, error: err.message }; + } +} + +/** + * 移除 base64 图片数据中的 Gemini 水印 + * + * @param {string} dataUrl - data:image/xxx;base64,... 格式的图片 + * @returns {Promise<{ ok: boolean, dataUrl?: string, width?: number, height?: number, logoSize?: number, error?: string }>} + */ +export async function removeWatermarkFromDataUrl(dataUrl) { + try { + console.log('[watermark-remover] 开始处理 base64 图片'); + + // 1. 解析 dataUrl + const mimeMatch = dataUrl.match(/^data:(image\/\w+);base64,/); + if (!mimeMatch) { + return { ok: false, error: 'invalid_data_url' }; + } + const mime = mimeMatch[1]; + const base64Data = dataUrl.slice(mimeMatch[0].length); + const inputBuffer = Buffer.from(base64Data, 'base64'); + + // 2. 读取图片信息 + const metadata = await sharp(inputBuffer).metadata(); + const { width, height } = metadata; + + if (!width || !height) { + return { ok: false, error: 'invalid_image_metadata' }; + } + + // 3. 检测水印配置 + const config = detectWatermarkConfig(width, height); + const position = calculateWatermarkPosition(width, height, config); + + if (position.x < 0 || position.y < 0) { + console.log(`[watermark-remover] 图片太小（${width}×${height}），跳过去水印`); + return { ok: true, dataUrl, width, height, skipped: true, reason: 'image_too_small' }; + } + + // 4. 获取 Alpha Map + const alphaMap = await getAlphaMap(config.logoSize); + + // 5. 提取像素、反向混合 + const { data: pixels, info } = await sharp(inputBuffer) + .raw() + .ensureAlpha() + .toBuffer({ resolveWithObject: true }); + + removeWatermarkPixels(pixels, info.width, alphaMap, position); + + // 6. 编码回原格式 + const ext = mime.split('/')[1]; + let outputPipeline = sharp(pixels, { + raw: { width: info.width, height: info.height, channels: info.channels }, + }); + + switch (ext) { + case 'jpeg': + case 'jpg': + outputPipeline = outputPipeline.jpeg({ quality: 95 }); + break; + case 'webp': + outputPipeline = outputPipeline.webp({ quality: 95 }); + break; + default: + outputPipeline = outputPipeline.png(); + break; + } + + const outputBuffer = await outputPipeline.toBuffer(); + const outputBase64 = outputBuffer.toString('base64'); + const outputDataUrl = `data:${mime};base64,${outputBase64}`; + + console.log(`[watermark-remover] ✅ base64 去水印完成: ${width}×${height}, logo=${config.logoSize}px`); + return { ok: true, dataUrl: outputDataUrl, width, height, logoSize: config.logoSize }; + } catch (err) { + console.error(`[watermark-remover] ❌ base64 去水印失败: ${err.message}`); + return { ok: false, error: err.message }; + } +}