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DotImage提供了多种方式将PDF转换为TIFF文件。其中的一种方法是将所有图像一次性加载到内存中，然后将所有图像发送到TiffEncoder并保存。代码如下：

[C#]

// First way
TiffEncoder enc = new TiffEncoder();
enc.Save(outStream,myImageCollection,null);

// Second way
TiffEncoder noAppend = new TiffEncoder(TiffCompression.Default, true);
PdfDecoder pdf = new PdfDecoder();
for(int i=0; i< numPages; i++)
{
AtalaImage img = pdfDecoder.Read(inStream, i, null);
noAppend.Save(outStream, img, null);
img.Dispose();
outStream.Seek(0, SeekOrigin.Begin);
}

[VB.NET]

' First way
Private enc As TiffEncoder = New TiffEncoder()
enc.Save(outStream,myImageCollection,Nothing)

' Second way
Dim noAppend As TiffEncoder = New TiffEncoder(TiffCompression.Default, True)
Dim pdf As PdfDecoder = New PdfDecoder()
Dim i As Integer=0
Do While i< numPages
Dim img As AtalaImage = pdfDecoder.Read(inStream,i,Nothing)
noAppend.Save(outStream, img, Nothing)
img.Dispose()
outStream.Seek(0, SeekOrigin.Begin)
i += 1
Loop