Signature Extractor
Extract a handwritten signature from paper or contract photos to a transparent PNG, with auto crop.
从白纸或合同照片中提取手写签名，去掉背景输出透明 PNG，可直接贴到电子文档上。
墨迹阈值200
调低＝只留更深的笔画
对比强度1.5
调高＝背景更干净
签名颜色
自动裁边
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