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Instagram Photo Tools (Histogram & Zoom Viewer) JS - A professional-grade Instagram image extension tailored for photographers, colorists, and pixel-peepers. Without disrupting Instagram's native interface or user experience, this tool injects "studio-level" RGB histogram analysis and lossless pixel-level floating zoom view capabilities into every image (automatically ignoring videos and Reels to focus purely on photography). 在 Instagram 图片及放大图右上角外侧添加直方图按钮，支持双系统识别、大图大按钮、视口动态精确追踪、严格视口初始完全容纳、1:1真实像素放大上限限制（已排除视频），新增大图悬浮框选局部直方图功能（纯虚线无色彩干扰版）。