PDF Optimizer 在各方面對(duì)PDF文件進(jìn)行優(yōu)化。各種復(fù)雜功能的組合允許在沒(méi)有或最小的視覺(jué)質(zhì)量損失的情況下實(shí)現(xiàn)高壓縮。另一個(gè)應(yīng)用是為打印優(yōu)化PDF，通過(guò)合并嵌入式字體來(lái)減少線軸文件的大小，并應(yīng)用設(shè)備特定的色彩空間轉(zhuǎn)換。

PDF Optimizer 有不同的使用版本：作為Shell在命令行上使用，作為被監(jiān)視的文件夾服務(wù)和作為API在C#、Visual Basic、Java、C/C++中使用。

主要優(yōu)化項(xiàng)目

在代碼實(shí)現(xiàn)中，操作比較方便，也支持Windows和Linux開(kāi)發(fā)包，具體的類(lèi)庫(kù)和實(shí)現(xiàn)代碼看下面：

PDF Optimizer下載

// c#代碼
using (Optimizer optimizer = new Optimizer())
{
    // Choose the optimization profile for archiving
    optimizer.Profile = PDFOptimizationProfile.eOptimizationProfileArchive;

    // Open input file
    if (!optimizer.Open(inputPath, ""))
        throw new Exception(String.Format("Input file {0} cannot be opened. " +
            "{1} (ErrorCode: 0x{2:x}).", inputPath, optimizer.ErrorMessage, optimizer.ErrorCode));

    // Save output file
    if (!optimizer.SaveAs(outputPath, "", "", PDFPermission.ePermNoEncryption))
        throw new Exception(String.Format("Output file {0} cannot be created. " +
            "{1} (ErrorCode: 0x{2:x}).", outputPath, optimizer.ErrorMessage, optimizer.ErrorCode));

    // Close input file
    if (!optimizer.Close())
        throw new Exception(String.Format("Input file {0} cannot be closed. " +
            "{1} (ErrorCode: 0x{2:x}).", inputPath, optimizer.ErrorMessage, optimizer.ErrorCode));
}

// Java代碼
optimizer = new PdfOptimize();

// Choose the optimization profile for archiving
optimizer.setProfile(PdfOptimize.OPTIMIZATIONPROFILE.eOptimizationProfileArchive);

// Open input file
if (!optimizer.open(inputPath, "")) 
    throw new IOException(String.format("Input file %s cannot be opened. %s (ErrorCode: 0x%08x).",
        inputPath, optimizer.getErrorMessage(), optimizer.getErrorCode()));

// Save output file
if (!optimizer.saveAs(outputPath, "", "", NativeLibrary.PERMISSION.ePermNoEncryption)) 
    throw new IOException(String.format("Output file %s cannot be created. %s (ErrorCode: 0x%08x).",
        outputPath, optimizer.getErrorMessage(), optimizer.getErrorCode()));

// Close input file
if (!optimizer.close())
    throw new IOException(String.format("Input file %s cannot be closed. %s (ErrorCode: 0x%08x).",
        inputPath, optimizer.getErrorMessage(), optimizer.getErrorCode()));

// C++代碼
pOptimizer = PdfOptimizeCreateObject();

// Choose the optimization profile for archiving
PdfOptimizeSetProfile(pOptimizer, eOptimizationProfileArchive);

// Open input file
if (!PdfOptimizeOpen(pOptimizer, szInputPath, _T("")))
{
    _tprintf(_T("Input file %s cannot be opened. %s (ErrorCode: 0x%08x).\n"), szInputPath,
        PdfOptimizeGetErrorMessage(pOptimizer), PdfOptimizeGetErrorCode(pOptimizer));
    iReturnValue = 1;
    goto cleanup;
}

// Save output file
if (!PdfOptimizeSaveAs(pOptimizer, szOutputPath, _T(""), _T(""), ePermNoEncryption))
{
    _tprintf(_T("Output file %s cannot be created. %s (ErrorCode: 0x%08x).\n"), szOutputPath,
        PdfOptimizeGetErrorMessage(pOptimizer), PdfOptimizeGetErrorCode(pOptimizer));
    iReturnValue = 1;
    goto cleanup;
}

// Close input amd output files
if (!PdfOptimizeClose(pOptimizer))
{
    _tprintf(_T("Input file %s cannot be closed. %s (ErrorCode: 0x%08x).\n"), szInputPath,
        PdfOptimizeGetErrorMessage(pOptimizer), PdfOptimizeGetErrorCode(pOptimizer));
    iReturnValue = 1;
    goto cleanup;
}