问题描述
已经使用HTML5 canvas获得了电子签名原始数据，如何使用 ReportLab 在 PDF 文件中绘制签名？
电子签名原始数据如下：
data:image/png;base64,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 ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... WLU5HKOMOOVkMAAhCAgC8C8/n8n9I0/cFq/ev1+lPL5fIrvmzaaeFXbeLjMB7fYUX9EIAABOIlkGXZrydJ8oc1Ar+R57lY7/f+t3MZf9t6vjiM5+Dg4Nvffvvtd72TxQAIQAACEIiOwGw2e3U0Gomz+O//0jT90mKxeJD9+wSzU8Lftp7PBj6fYUTdEIAABCAgCGRZJkT/1QqNp+v1erZcLp+EQmhnhL9N9NnAF0o4YQcEIACBuAlsdvL/WZIkHxUk0jT97GKxeD0kKjsj/E2b+cTU/snJycGbb755ExJUbIEABCAAgXgjib394/H4dfHqXp7nYr0/qL+dEX5Brbqpj6n9oOIIYyAAAQhAoEZADABCmuLfmrdTwi+mfpv7VqvV6vLy8gWiDAIQgAAEIAABMwI7J/xmzeNqCEAAAhCAAASqBBB+4gECEIAABCAQEQGEPyJn01QIQAACEIAAwk8MQAACEIAABCIigPBH5GyaCgEIQAACEED4iQEIQAACEIBaraQQ/oicTVMhAAEIQAACCD8xAAEIQAACEIiIAMIfkbNpKgQgAAEIQADhJwYgAAEIQAACERFA+CNyNk2FAAQgAAEIIPzEAAQgAAEIQCAiAgh/RM6mqRCAAAQgAAGEnxiAAAQgAAEIREQA4Y/I2TQVAhCAAAQggPATAxCAAAQgAIGICCD8ETmbpkIAAhCAAAQQfmIAAhCAAAQgEBEBhD8iZ9NUCEAAAhCAAMJPDEAAAhCAAAQiIvB/pBqreADY5PwAAAAASUVORK5CYII=
解决方法
首先，您需要 base64解码数据，并将其转换为 PIL映像
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