python实现给pdf文件加骑缝章效果

骑缝章是在合同上经常看到的一种盖章方式，如下图所示。现在电子合同的应用已经越来越广泛，合同上如何实现骑缝章的效果，也是有必要研究一下的。本文几乎Python的方式，讲述了如果对印章图片进行处理，然后，实现给Pdf文件加上骑缝章的效果。

运行环境

Python3.0+

实现思路

实现思路如下：

#mermaid-svg-usW4rslHl3sJidcP {font-family:"trebuchet ms",verdana,arial,sans-serif;font-size:16px;fill:#333;}#mermaid-svg-usW4rslHl3sJidcP .error-icon{fill:#552222;}#mermaid-svg-usW4rslHl3sJidcP .error-text{fill:#552222;stroke:#552222;}#mermaid-svg-usW4rslHl3sJidcP .edge-thickness-normal{stroke-width:2px;}#mermaid-svg-usW4rslHl3sJidcP .edge-thickness-thick{stroke-width:3.5px;}#mermaid-svg-usW4rslHl3sJidcP .edge-pattern-solid{stroke-dasharray:0;}#mermaid-svg-usW4rslHl3sJidcP .edge-pattern-dashed{stroke-dasharray:3;}#mermaid-svg-usW4rslHl3sJidcP .edge-pattern-dotted{stroke-dasharray:2;}#mermaid-svg-usW4rslHl3sJidcP .marker{fill:#333333;stroke:#333333;}#mermaid-svg-usW4rslHl3sJidcP .marker.cross{stroke:#333333;}#mermaid-svg-usW4rslHl3sJidcP svg{font-family:"trebuchet ms",verdana,arial,sans-serif;font-size:16px;}#mermaid-svg-usW4rslHl3sJidcP .label{font-family:"trebuchet ms",verdana,arial,sans-serif;color:#333;}#mermaid-svg-usW4rslHl3sJidcP .cluster-label text{fill:#333;}#mermaid-svg-usW4rslHl3sJidcP .cluster-label span{color:#333;}#mermaid-svg-usW4rslHl3sJidcP .label text,#mermaid-svg-usW4rslHl3sJidcP span{fill:#333;color:#333;}#mermaid-svg-usW4rslHl3sJidcP .node rect,#mermaid-svg-usW4rslHl3sJidcP .node circle,#mermaid-svg-usW4rslHl3sJidcP .node ellipse,#mermaid-svg-usW4rslHl3sJidcP .node polygon,#mermaid-svg-usW4rslHl3sJidcP .node path{fill:#ECECFF;stroke:#9370DB;stroke-width:1px;}#mermaid-svg-usW4rslHl3sJidcP .node .label{text-align:center;}#mermaid-svg-usW4rslHl3sJidcP .node.clickable{cursor:pointer;}#mermaid-svg-usW4rslHl3sJidcP .arrowheadPath{fill:#333333;}#mermaid-svg-usW4rslHl3sJidcP .edgePath .path{stroke:#333333;stroke-width:2.0px;}#mermaid-svg-usW4rslHl3sJidcP .flowchart-link{stroke:#333333;fill:none;}#mermaid-svg-usW4rslHl3sJidcP .edgeLabel{background-color:#e8e8e8;text-align:center;}#mermaid-svg-usW4rslHl3sJidcP .edgeLabel rect{opacity:0.5;background-color:#e8e8e8;fill:#e8e8e8;}#mermaid-svg-usW4rslHl3sJidcP .cluster rect{fill:#ffffde;stroke:#aaaa33;stroke-width:1px;}#mermaid-svg-usW4rslHl3sJidcP .cluster text{fill:#333;}#mermaid-svg-usW4rslHl3sJidcP .cluster span{color:#333;}#mermaid-svg-usW4rslHl3sJidcP div.mermaidTooltip{position:absolute;text-align:center;max-width:200px;padding:2px;font-family:"trebuchet ms",verdana,arial,sans-serif;font-size:12px;background:hsl(80, 100%, 96.2745098039%);border:1px solid #aaaa33;border-radius:2px;pointer-events:none;z-index:100;}#mermaid-svg-usW4rslHl3sJidcP :root{--mermaid-font-family:"trebuchet ms",verdana,arial,sans-serif;}

印章PNG文件

印章图片分割

PDF合同文件

读取页数

创建空白同页数PDF文件

图片绘制PDF制定位置

临时PDF

融合

最终结果

一定要避免一个误区，尽量不要在word上操作，然后再转PDF。python实现Word转PDF基本都要依赖于windows上安装的Word程序，这就限制了只能在Windows上运行。

实现效果

注意，必须是A4纸大小的PDF文件

核心代码

图片分割

def xz(image_path, count):"""将图片水平分割:param image_path:PNG图片路径:param count: 页数:return:"""img_path = image_path# 判断是否有效if img_path != '':print(img_path)  # 图片路径# 分割成1行img_split_row = 1  # 行数# 分割成几列sp = count  # 输入拆分列数量img_split_col = int(sp)# 要保存的图片路径(保存为png图片格式)if os.path.dirname(img_path) == "":img_path = os.getcwd() + os.sep + img_pathimg_save = os.path.dirname(img_path) + os.sep + "images" + os.sepif not os.path.exists(img_save):os.makedirs(img_save)# 分割图片img_ext_name = os.path.splitext(os.path.basename(img_path))[1]img_now = imim.open(img_path)split_size_w = int(img_now.size[0] / img_split_col)split_size_h = int(img_now.size[1] / img_split_row)result_path = []for r in range(img_split_row):for c in range(img_split_col):split_area = (split_size_w * c, r * split_size_h, split_size_w * (c + 1), split_size_h * (r + 1))# print( (r*img_split_col+c+1) );img_now.crop(split_area).save(img_save + str(r * img_split_col + c + 1) + img_ext_name)result_path.append(img_save + str(r * img_split_col + c + 1) + img_ext_name)time.sleep(0.5)  # 等待# 结束print("图片分割结束，一共" + str(img_split_row * img_split_col) + "张图片（保存在" + img_save)return (result_path, split_size_w, split_size_h)

PDF合成

from PyPDF2 import PdfReader,PdfWriter
import osdef merge_pdf(water_pdf, target_pdf, result_path):"""两个pdf融合:param water_pdf: 水印PDF文件:param target_pdf: 合同PDF文件:param result_path: 结果输出录路径:return: """# 获取页数pages_count = get_num_pages(target_pdf)watermark_reader = PdfReader(target_pdf)# 读取需要被添加水印的PDFreader = PdfReader(water_pdf)writer = PdfWriter()# 遍历所有页面for page_index in range(0, pages_count):# 合并水印页面page = watermark_reader.pages[page_index]page.merge_page(reader.pages[page_index])writer.add_page(page)with open(result_path, "wb") as f:writer.write(f)

源代码下载

如果还有疑问，可以前往下载源代码https://download.csdn.net/download/GISuuser/87387763