Hi All,

I'm am having trouble resizing a multipage TIFF file. The TIFF is 640x480
and I am trying to resize ALL frames to 320x280. If I resize it by creating
a new bitmap at the target size and resave, it loses the pages. If I loop
through all the pages and resize each page into new bitmap, then recreate
the TIFF, I get an Invalid Parameter Used exception. What is confusing is
that the code to create a multipaged TIFF from an array of newly drawn
images works. It seems to be when I open a multipaged TIFF and try to use
copies of the frames as a source for another TIFF where the issue occurs.

Dim imageFile As System.IO.StreamReader = New
System.IO.StreamReader("my_multipaged_tiff.tiff")
Dim tiffImage As System.Drawing.Bitmap = New Bitmap(imageFile.BaseStream)
Dim images(tiffImage.GetFrameCount(Imaging.FrameDimens ion.Page) - 1) As
Drawing.Bitmap

For imageIndex As Int32 = 0 To images.GetUpperBound(0)
tiffImage.SelectActiveFrame(Drawing.Imaging.FrameD imension.Page,
imageIndex)
images(imageindex) = GetReducedImage(CType(tiffImage.Clone, Bitmap))
Next



FYI

Public Shared Function GetReducedImage(ByRef image As Bitmap) As Bitmap

Dim result As Image = New Bitmap(image.Width,
image.Height,Imaging.PixelFormat.Format16bppRgb555 )
g = Graphics.FromImage(result)
g.DrawImageUnscaled(image, 0, 0)

Return CType(result, Bitmap)

End Function

Check out the multi-page TIFF articles in the GDI+ FAQ.
--
Bob Powell [MVP]
Visual C#, System.Drawing

Ramuseco Limited .NET consulting
http://www.ramuseco.com

Find great Windows Forms articles in Windows Forms Tips and Tricks
http://www.bobpowell.net/tipstricks.htm

Answer those GDI+ questions with the GDI+ FAQ
http://www.bobpowell.net/faqmain.htm

All new articles provide code in C# and VB.NET.
Subscribe to the RSS feeds provided and never miss a new article.





landers wrote:

Hi Bob,

Already checked the website out and it doesn't really answer my question.

I am trying to read a multipaged TIFF in, resize it and write it out to a
new TIFF. I can already get random images and create a multipaged TIFF, but
its when my source images are from a page within a TIFF where I get the
problem.

Landers.

"Bob Powell [MVP]" <bob (AT) _spamkiller_bobpowell (DOT) net> wrote

My article explains how to totally decompose a multi page tiff and
insert a new image into it. The implication of this is that you can pull
the thing apart and add back a changed version -ie resized- of the image.

http://www.bobpowell.net/addframes.htm

--
Bob Powell [MVP]
Visual C#, System.Drawing

Ramuseco Limited .NET consulting
http://www.ramuseco.com

Find great Windows Forms articles in Windows Forms Tips and Tricks
http://www.bobpowell.net/tipstricks.htm

Answer those GDI+ questions with the GDI+ FAQ
http://www.bobpowell.net/faqmain.htm

All new articles provide code in C# and VB.NET.
Subscribe to the RSS feeds provided and never miss a new article.





landers wrote: