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支持透明背景，更适合原图本身带透明区域，或需要保留清晰文字和线条的情况。选择 PNG 不会让低清晰度原图自动变清楚，JPG 画质比例调低后也应放大检查文字边缘和细节。",[112,176,177],{},"当前任务中的所有图片会共用同一种输出设置。若一批图片里既有普通照片，又有必须保留透明区域的 PNG，建议拆成两次处理，避免为了统一格式而丢失透明背景或生成不必要的大文件。",[125,179,181],{"id":180},"下载zip后检查三件事","下载ZIP后检查三件事",[112,183,184],{},"确认每张图的预览后，点击“开始处理”。页面会把处理结果打包成 ZIP，由浏览器保存到下载目录。本次用两张非敏感测试图实际处理，ZIP 中得到 2 张 JPEG：一张为 1600×900，另一张为 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