Breaking multi-page tiffs

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Hello all, I have searched all over the net, and tried many different things;
but now I am stumped. I am trying to break multipage tiffs into individual
frames and reformatting them to a different compression style.

The application works great on normal tif files, the problem occurs on some
unusual tif images. For instance: the link provided is an 8 page tif file.
The first 5 pages convert just fine, but pages 6 though 8 throw a Generic
GDI+ exception on the SelectActiveFra me method of the image object. Part of
the problem could be that pages 1-5 are 1bit and pages 6-8 are 8 bit.

I threw together some simple code to demonstrate the issue. I would
appreciate any help. If I can get out the individual pages, I can build the
encoders and handle the process of building a new multipage, this code was
simplified to make it easier to get some help.

Thanks, Dan
//using System.Drawing;
//using System.Drawing. Imaging;
//code start
Image inImg;
inImg = Image.FromFile( @"C:\dlbtemp\F3 2044996.tif");
for (int i = 0; i < inImg.GetFrameC ount(FrameDimen sion.Page); i++)
{
inImg.SelectAct iveFrame(FrameD imension.Page, i);
inImg.Save(@"C: \dlbtemp\F32044 996_" + i.ToString() + ".tif",
ImageFormat.Tif f);
}
//code end
//example image: http://www.dbpic.com/pub/F32044996.tif

[Peter Duniho]

On Thu, 09 Oct 2008 09:07:03 -0700, Dano <po******@newsg roup.nospamwrot e:

[...]
The application works great on normal tif files, the problem occurs on
some
unusual tif images. For instance: the link provided is an 8 page tif
file.
The first 5 pages convert just fine, but pages 6 though 8 throw a Generic
GDI+ exception on the SelectActiveFra me method of the image object. Part
of
the problem could be that pages 1-5 are 1bit and pages 6-8 are 8 bit.

Probably is.

What the precise problem might be, I can't say. It could be that .NET
doesn't support mixed-format TIFFs. Or it could just be that particular
8-bit format it doesn't support. Either way, the bottom line is that .NET
has limited support for certain image formats. If it doesn't work and
you're sure the image file itself is valid, then you're pretty much just
stuck. If you can control the input to ensure a file that .NET does
support, then it might be worth figuring out what exactly is bothering
..NET. Otherwise, you probably will have to implement that functionality
yourself. :(

Pete