pip install Spire.PDF

from spire.pdf import *
from spire.pdf.common import *

from spire.pdf import *
from spire.pdf.common import *

# 定義輸入輸出路徑
inputFile = "document.pdf"
outputFolder = "output_images"

# 創(chuàng)建 PDF 文檔對(duì)象
doc = PdfDocument()

# 加載 PDF 文件
doc.LoadFromFile(inputFile)

# 遍歷每一頁(yè)并轉(zhuǎn)換為圖片
for i in range(doc.Pages.Count):
    # 構(gòu)建輸出文件名
    fileName = outputFolder + "\page-{0:d}.png".format(i)
    
    # 將頁(yè)面保存為圖片
    with doc.SaveAsImage(i) as imageS:
        imageS.Save(fileName)

# 關(guān)閉文檔
doc.Close()

fileName = "output_page.png"
with doc.SaveAsImage(0) as imageS:
    imageS.Save(fileName)  # 默認(rèn)保存為 PNG 格式

from System.Drawing.Imaging import ImageFormat

fileName = "output_page.jpg"
with doc.SaveAsImage(0) as imageS:
    imageS.Save(fileName, ImageFormat.get_Jpeg())

fileName = "output_page.bmp"
with doc.SaveAsImage(0) as imageS:
    imageS.Save(fileName, ImageFormat.get_Bmp())

from spire.pdf import *
from spire.pdf.common import *

inputFile = "report.pdf"
doc = PdfDocument()
doc.LoadFromFile(inputFile)

# 只轉(zhuǎn)換第 3 頁(yè)（索引從 0 開(kāi)始）
pageNumber = 2  # 第 3 頁(yè)
fileName = "page_3.png"

with doc.SaveAsImage(pageNumber) as imageS:
    imageS.Save(fileName)

doc.Close()

# 轉(zhuǎn)換前 5 頁(yè)
for i in range(min(5, doc.Pages.Count)):
    fileName = "output\page-{0:d}.png".format(i)
    with doc.SaveAsImage(i) as imageS:
        imageS.Save(fileName)

# 轉(zhuǎn)換最后 3 頁(yè)
startPage = max(0, doc.Pages.Count - 3)
for i in range(startPage, doc.Pages.Count):
    fileName = "output\page-{0:d}.png".format(i)
    with doc.SaveAsImage(i) as imageS:
        imageS.Save(fileName)

from spire.pdf import *
from spire.pdf.common import *

inputFile = "transparent.pdf"
outputFile = "transparent_output.png"

doc = PdfDocument()
doc.LoadFromFile(inputFile)

# 設(shè)置 PDF 轉(zhuǎn)圖片選項(xiàng)，啟用透明背景
doc.ConvertOptions.SetPdfToImageOptions(0)

# 轉(zhuǎn)換為 PNG 格式（支持透明度）
with doc.SaveAsImage(0, PdfImageType.Bitmap) as imageS:
    imageS.Save(outputFile)

doc.Close()

import os
from spire.pdf import *
from spire.pdf.common import *

def batch_convert_pdf_to_image(input_folder, output_folder):
    """批量轉(zhuǎn)換文件夾中的所有 PDF 文件"""
    
    # 確保輸出目錄存在
    if not os.path.exists(output_folder):
        os.makedirs(output_folder)
    
    # 遍歷所有 PDF 文件
    for filename in os.listdir(input_folder):
        if filename.lower().endswith('.pdf'):
            pdf_path = os.path.join(input_folder, filename)
            base_name = os.path.splitext(filename)[0]
            
            # 為每個(gè) PDF 創(chuàng)建子目錄
            pdf_output_dir = os.path.join(output_folder, base_name)
            if not os.path.exists(pdf_output_dir):
                os.makedirs(pdf_output_dir)
            
            # 轉(zhuǎn)換當(dāng)前 PDF
            doc = PdfDocument()
            doc.LoadFromFile(pdf_path)
            
            for i in range(doc.Pages.Count):
                image_path = os.path.join(
                    pdf_output_dir, 
                    "page-{0:d}.png".format(i)
                )
                with doc.SaveAsImage(i) as imageS:
                    imageS.Save(image_path)
            
            doc.Close()
            print("已轉(zhuǎn)換：{0}".format(filename))

# 使用示例
batch_convert_pdf_to_image("input_pdfs", "output_images")

# 高質(zhì)量 JPEG 轉(zhuǎn)換示例
from System.Drawing.Imaging import Encoder, EncoderParameter
from System.Drawing.Imaging import ImageCodecInfo

# 獲取 JPEG 編碼器
jpegCodec = None
for codec in ImageCodecInfo.GetImageEncoders():
    if codec.MimeType == "image/jpeg":
        jpegCodec = codec
        break

# 設(shè)置高質(zhì)量參數(shù)
encoderParams = EncoderParameters(1)
qualityParam = EncoderParameter(Encoder.Quality, 95)  # 95% 質(zhì)量
encoderParams.Param[0] = qualityParam

# 保存時(shí)應(yīng)用參數(shù)
with doc.SaveAsImage(0) as imageS:
    imageS.Save("high_quality.jpg", jpegCodec, encoderParams)

from spire.pdf import *
import os

class DocumentPreviewGenerator:
    def __init__(self, input_pdf, preview_size='medium'):
        self.input_pdf = input_pdf
        self.preview_size = preview_size
        self.doc = PdfDocument()
        
    def generate_previews(self, output_dir, max_pages=10):
        """生成文檔預(yù)覽圖片"""
        
        self.doc.LoadFromFile(self.input_pdf)
        
        if not os.path.exists(output_dir):
            os.makedirs(output_dir)
        
        # 限制最大頁(yè)數(shù)
        pages_to_convert = min(max_pages, self.doc.Pages.Count)
        
        previews = []
        for i in range(pages_to_convert):
            filename = os.path.join(output_dir, "preview_{0}.png".format(i))
            
            with self.doc.SaveAsImage(i) as imageS:
                imageS.Save(filename)
                previews.append(filename)
        
        self.doc.Close()
        return previews
    
    def get_thumbnail(self, page_index, size='small'):
        """獲取指定頁(yè)面的縮略圖"""
        # 可以根據(jù)需要添加縮略圖生成邏輯
        pass

# 使用示例
generator = DocumentPreviewGenerator("document.pdf")
previews = generator.generate_previews("previews", max_pages=5)
print("已生成 {0} 個(gè)預(yù)覽圖片".format(len(previews)))

doc = PdfDocument()
doc.LoadFromFile(large_file.pdf)

for i in range(doc.Pages.Count):
    with doc.SaveAsImage(i) as imageS:
        imageS.Save("page_{0}.png".format(i))
    # 每處理 10 頁(yè)釋放一次內(nèi)存
    if i % 10 == 0:
        import gc
        gc.collect()

doc.Close()