.NET 以O2S方式 PDF 转图片

依赖下载

O2S.Components.PDFRender4NET.Win

System.Drawing.Common

目录结构

关键代码

PDFTranImgHelp

using O2S.Components.PDFRender4NET;
using System;
using System.Collections.Generic;
using System.Drawing;
using System.Drawing.Imaging;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace PDFTo
{
    public enum Definition
    {
        One = 1, Two = 2, Three = 3, Four = 4, Five = 5, Six = 6, Seven = 7, Eight = 8, Nine = 9, Ten = 10
    }
    public class PDFTranImgHelp
    {
        /// <summary>
        /// 将PDF文档转换为图片的方法
        /// </summary>
        /// <param name="pdfInputPath">PDF文件路径</param>
        /// <param name="imageOutputPath">图片输出路径</param>
        /// <param name="imageName">生成图片的名字</param>
        /// <param name="startPageNum">从PDF文档的第几页开始转换</param>
        /// <param name="endPageNum">从PDF文档的第几页开始停止转换</param>
        /// <param name="imageFormat">设置所需图片格式</param>
        /// <param name="definition">设置图片的清晰度，数字越大越清晰</param>
        public static void ConvertPDF2Image(
                string pdfInputPath,
                string imageOutputPath,
                string imageName,
                int startPageNum, 
                int endPageNum, 
                ImageFormat imageFormat, 
                Definition definition)
        {
            PDFFile pdfFile = PDFFile.Open(pdfInputPath);
            if (!Directory.Exists(imageOutputPath))
            {
                Directory.CreateDirectory(imageOutputPath);
            }
            // validate pageNum
            if (startPageNum <= 0)
            {
                startPageNum = 1;
            }
            if (endPageNum > pdfFile.PageCount)
            {
                endPageNum = pdfFile.PageCount;
            }
            if (startPageNum > endPageNum)
            {
                int tempPageNum = startPageNum;
                startPageNum = endPageNum;
                endPageNum = startPageNum;
            }
            // start to convert each page
            for (int i = startPageNum; i <= endPageNum; i++)
            {
                Bitmap pageImage = pdfFile.GetPageImage(i - 1, 56 * (int)definition);
                pageImage.Save(imageOutputPath + imageName +"_"+ i.ToString() + "." + imageFormat.ToString(), imageFormat);
                pageImage.Dispose();
            }
            pdfFile.Dispose();
        }
    }
}

测试

目标PDF

转化结果

调用代码

using System.Drawing.Imaging;
using PDFTo;

PDFTranImgHelp.ConvertPDF2Image(
    "Z:\\ocr\\tessdata\\01.pdf", 
    "Z:\\ocr\\tessdata\\", 
    "myPng",
    1,
    1,
    ImageFormat.Png,
    Definition.Ten);