这是一款基于 FLUX.2 Klein 9B + 双阶段放大链 的高清图片放大应用。用户上传一张 原图 后，系统会先进行基础像素放大，再通过第一阶段重绘增强细节，然后接入 AI超分模型放大，再进行一次低强度精修，最后输出一张清晰度更高、细节更丰富、同时尽量保持原图色彩和曝光一致的高清图片。文件结构里可以明显看到：ImageScaleToTotalPixels → KSampler → ImageUpscaleWithModel → ImageScaleBy → KSampler 这一整套“放大 + 回缩 + 精修”的链路，所以它不是简单超分，而是偏成品级高清重建。
它特别适合做：低清图片高清化、旧图修复、封面大图生成、电商素材放大、海报高清重制等场景。相比普通放大，这套流的优势是：不仅变大，还会补细节、控色彩、再精修，让结果更像原图但更清晰。 默认建议用户只调 原图 + 基础清晰度 + 提示词；如果想更锐或更自然，再去调两段 放大强度
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