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Image.FromFile(@"path\filename.tif")

or

Image.FromStream(memoryStream)

both produce image objects with only one frame even though the source is a multi-frame TIFF file. How do you load an image file that retains these frames? The tiffs are saved using the Image.SaveAdd methods frame by frame. They work in other viewers but .NET Image methods will not load these frames, only the first.

Does this mean that there is no way to return a multi-frame TIFF from a method where I am passing in a collection of bitmaps to be used as frames?

mirezus
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3 Answers3

33

Here's what I use:

private List<Image> GetAllPages(string file)
{
    List<Image> images = new List<Image>();
    Bitmap bitmap = (Bitmap)Image.FromFile(file);
    int count = bitmap.GetFrameCount(FrameDimension.Page);
    for (int idx = 0; idx < count; idx++)
    {
        // save each frame to a bytestream
        bitmap.SelectActiveFrame(FrameDimension.Page, idx);
        MemoryStream byteStream = new MemoryStream();
        bitmap.Save(byteStream, ImageFormat.Tiff);

        // and then create a new Image from it
        images.Add(Image.FromStream(byteStream));
    }
    return images;
}
Andy
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Otávio Décio
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  • Does this mean that there is no way to return a multi-frame TIFF from a method where I am passing in a collection of bitmaps to be used as frames? – mirezus Dec 30 '08 at 21:38
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    Pretty much yes - you have to remember that in a multiframe TIFF each frame can have its own set of encoding options (compression, color, quality). Bitmaps on the other hand are much simpler animals. – Otávio Décio Dec 30 '08 at 21:41
3

I was able to handle the multi-frame tiff by using the below method.

Image multiImage = Image.FromFile(sourceFile);

multiImage.Save(destinationFile, tiff, prams);

int pageCount = multiImage.GetFrameCount(FrameDimension.Page);

for (int page = 1; page < pageCount; page++ )
{
    multiImage.SelectActiveFrame(FrameDimension.Page,page);
    multiImage.SaveAdd(dupImage,prams);
}

multiImage.SaveAdd(newPage, prams);
multiImage.Dispose();

I have not tried the solution in .net 2.0 but MSDN shows the class members to exist. It did fix my problem in .net 4.5.2.

Chris
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-1

bitmap.Dispose();

After For loop you need to Dispose bitmap. Otherwise you get error "file using other process" when try to use same file in other process.

Adem Canpolat
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