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点击下载Spire.PDF for .NET最新试用版

将 PDF 转换为灰度

以下是将彩色 PDF 转换为灰度的步骤：

• 使用PdfGrayConverter类加载 PDF 文件。
• 使用PdfGrayConverter.ToGrayPdf()方法将 PDF 转换为灰度。

using Spire.Pdf.Conversion;
 
namespace ConvertPdfToGrayscale
{
    class Program
    {
        static void Main(string[] args)
        {
            //Create a PdfGrayConverter instance and load a PDF file
            PdfGrayConverter converter = new PdfGrayConverter(@"Sample.pdf");
            //Convert the PDF to grayscale
            converter.ToGrayPdf("Grayscale.pdf");
            converter.Dispose();
        }
    }
}

Imports Spire.Pdf.Conversion

Namespace ConvertPdfToGrayscale
    Friend Class Program
        Private Shared Sub Main(ByVal args As String())
            'Create a PdfGrayConverter instance and load a PDF file
            Dim converter As PdfGrayConverter = New PdfGrayConverter("Sample.pdf")
            'Convert the PDF to grayscale
            converter.ToGrayPdf("Grayscale.pdf")
            converter.Dispose()
        End Sub
    End Class
End Namespace

输出PDF：