wkhtmltopdf 与 IronPDF：技术比较指南

RegisteredDecoders.Decoders.Add(new TiffDecoder());
RegisteredDecoders.Decoders.Add(new JpegDecoder());
using (FileStream fs = new FileStream("scan.tif", FileMode.Open))
using (AtalaImage image = new AtalaImage(fs))
{
    new DespeckleCommand(2).ApplyToImage(image);
    AutoDeskewCommand deskew = new AutoDeskewCommand();
    deskew.ApplyToImage(image);
    using (FileStream outFs = new FileStream("scan-clean.jpg", FileMode.Create))
        image.Save(outFs, new JpegEncoder(85), null);
}

Imports System.IO

RegisteredDecoders.Decoders.Add(New TiffDecoder())
RegisteredDecoders.Decoders.Add(New JpegDecoder())

Using fs As New FileStream("scan.tif", FileMode.Open)
    Using image As New AtalaImage(fs)
        Dim despeckleCommand As New DespeckleCommand(2)
        despeckleCommand.ApplyToImage(image)

        Dim deskew As New AutoDeskewCommand()
        deskew.ApplyToImage(image)

        Using outFs As New FileStream("scan-clean.jpg", FileMode.Create)
            image.Save(outFs, New JpegEncoder(85), Nothing)
        End Using
    End Using
End Using

PdfDecoder decoder = new PdfDecoder();
RegisteredDecoders.Decoders.Add(decoder);
using (FileStream pdfStream = new FileStream("input.pdf", FileMode.Open))
{
    int pageCount = decoder.GetImageInfo(pdfStream).FrameCount;
    for (int i = 0; i < pageCount; i++)
    {
        pdfStream.Position = 0;
        using (AtalaImage page = decoder.Read(pdfStream, i, null))
        using (FileStream outFs = new FileStream($"page_{i + 1}.png", FileMode.Create))
            page.Save(outFs, new PngEncoder(), null);
    }
}

Imports System.IO

Dim decoder As New PdfDecoder()
RegisteredDecoders.Decoders.Add(decoder)
Using pdfStream As New FileStream("input.pdf", FileMode.Open)
    Dim pageCount As Integer = decoder.GetImageInfo(pdfStream).FrameCount
    For i As Integer = 0 To pageCount - 1
        pdfStream.Position = 0
        Using page As AtalaImage = decoder.Read(pdfStream, i, Nothing)
            Using outFs As New FileStream($"page_{i + 1}.png", FileMode.Create)
                page.Save(outFs, New PngEncoder(), Nothing)
            End Using
        End Using
    Next
End Using

var renderer = new ChromePdfRenderer();
string html = @"<h1>Invoice 2026-0428</h1><p>Customer: Acme Corp</p><p>Total due: $1,240.00</p>";
using var pdf = renderer.RenderHtmlAsPdf(html);
pdf.SaveAs("invoice.pdf");

Dim renderer As New ChromePdfRenderer()
Dim html As String = "<h1>Invoice 2026-0428</h1><p>Customer: Acme Corp</p><p>Total due: $1,240.00</p>"
Using pdf = renderer.RenderHtmlAsPdf(html)
    pdf.SaveAs("invoice.pdf")
End Using

using (OcrEngine engine = new Tesseract5Engine())
{
    engine.Initialize();
    engine.Languages.Add(engine.GetSupportedLanguages()[0]);
    using (FileSystemImageSource src = new FileSystemImageSource(new[] { "multi-page.tif" }, true))
    {
        engine.Translate(src, "application/pdf", "searchable.pdf",
                         new OcrTranslationSettings { MimeType = "application/pdf" });
    }
    engine.Shutdown();
}

Imports System

Using engine As New Tesseract5Engine()
    engine.Initialize()
    engine.Languages.Add(engine.GetSupportedLanguages()(0))
    Using src As New FileSystemImageSource(New String() {"multi-page.tif"}, True)
        engine.Translate(src, "application/pdf", "searchable.pdf", 
                         New OcrTranslationSettings With {.MimeType = "application/pdf"})
    End Using
    engine.Shutdown()
End Using

var ocr = new IronTesseract();
using var input = new OcrInput("scanned-document.png");
input.Deskew();
input.DeNoise();
var result = ocr.Read(input);
Console.WriteLine($"Confidence: {result.Confidence}");

Imports IronTesseract

Dim ocr As New IronTesseract()
Using input As New OcrInput("scanned-document.png")
    input.Deskew()
    input.DeNoise()
    Dim result = ocr.Read(input)
    Console.WriteLine($"Confidence: {result.Confidence}")
End Using

BarCodeReader reader = new BarCodeReader();
reader.Symbology = Symbologies.Qr | Symbologies.DataMatrix |
                   Symbologies.Pdf417 | Symbologies.Code128 | Symbologies.Upca;
reader.Direction = Directions.All;
using (AtalaImage image = new AtalaImage("barcoded.png"))
{
    BarCode[] results = reader.ReadBars(image);
    foreach (BarCode bc in results)
        Console.WriteLine($"{bc.Symbology}: {bc.DataString}");
}

Imports System

Dim reader As New BarCodeReader()
reader.Symbology = Symbologies.Qr Or Symbologies.DataMatrix Or Symbologies.Pdf417 Or Symbologies.Code128 Or Symbologies.Upca
reader.Direction = Directions.All

Using image As New AtalaImage("barcoded.png")
    Dim results As BarCode() = reader.ReadBars(image)
    For Each bc As BarCode In results
        Console.WriteLine($"{bc.Symbology}: {bc.DataString}")
    Next
End Using

var results = BarcodeReader.Read("shipment-label.png");
foreach (var barcode in results)
{
    Console.WriteLine($"Value: {barcode.Value}");
    Console.WriteLine($"Format: {barcode.BarcodeType}");
}

Dim results = BarcodeReader.Read("shipment-label.png")
For Each barcode In results
    Console.WriteLine($"Value: {barcode.Value}")
    Console.WriteLine($"Format: {barcode.BarcodeType}")
Next

Form host = new Form();
Device device = AvailableDevices.Default;
device.UI.UseDefaultUI = false;
device.Pages = 0; // 0 = all pages from ADF
using (TiffEncoder encoder = new TiffEncoder(TiffCompression.CcittGroup4))
using (TiffMultiFrameStream output = new TiffMultiFrameStream(
    new FileStream("scanned.tif", FileMode.Create), encoder))
{
    device.ImageAcquired += (s, e) => output.AppendImage(e.Image);
    device.Acquire(host);
}

Imports System.IO

Dim host As New Form()
Dim device As Device = AvailableDevices.Default
device.UI.UseDefaultUI = False
device.Pages = 0 ' 0 = all pages from ADF

Using encoder As New TiffEncoder(TiffCompression.CcittGroup4)
    Using output As New TiffMultiFrameStream(New FileStream("scanned.tif", FileMode.Create), encoder)
        AddHandler device.ImageAcquired, Sub(s, e) output.AppendImage(e.Image)
        device.Acquire(host)
    End Using
End Using