[Insight-users] Tif RGB wrong way around?

[John Biddiscombe]

Thanks.

JB

----- Original Message ----- 
From: "Lorensen, William E (Research)" <lorensen at crd.ge.com>
To: "'John Biddiscombe'" <jbiddiscombe at skippingmouse.co.uk>; "Julien Jomier"
<jjomier at cs.unc.edu>; <insight-users at itk.org>
Sent: Monday, July 19, 2004 9:51 PM
Subject: RE: [Insight-users] Tif RGB wrong way around?


> We have found the problem. Nothing in the tiff stuff. It was a problem (a
> couple actually) in the ConvertBuffer code. There still are some issues
> regarding the handling of alpha channels, but I've checked in the changes
to
> fix the color problems.
>
> Bill
>
> -----Original Message-----
> From: John Biddiscombe [mailto:jbiddiscombe at skippingmouse.co.uk]
> Sent: Friday, July 09, 2004 11:03 AM
> To: John Biddiscombe; Julien Jomier; insight-users at itk.org
> Subject: Re: [Insight-users] Tif RGB wrong way around?
>
>
> After doing some digging I became convinced that there is nothing wrong
with
> the itk->vtk RGB pixels and so I tried exporting my TIFF as bmp using the
> following code. The exported Bitmap has RGB components the wrong way
around.
>
> I'm therefore reasonably confident that the TIFF reader is messing about.
>
> I'll modify my local version to give what I hope will be the correct
images
> and post a patch should anyone else have trouble.
>
> JB
>
>
> typedef itk::ImageFileReader< ImageTypeRGB2D > ReaderType;
> ReaderType::Pointer reader = ReaderType::New();
> //
> reader->SetFileName( filename );
> //
> try
> {
> reader->Update();
> }
> catch( itk::ExceptionObject & err )
> {
> std::cout << "ExceptionObject caught !" << std::endl;
> std::cout << err << std::endl;
> return NULL;
> }
> typedef itk::ImageFileWriter< ImageTypeRGB2D > WriterType;
> WriterType::Pointer writer = WriterType::New();
> //
> writer->SetFileName("D:/Test.bmp");
> writer->SetInput(reader->GetOutput());
> writer->Update();
> return reader->GetOutput();
>
>
> ----- Original Message ----- 
> From: "John Biddiscombe" <jbiddiscombe at skippingmouse.co.uk>
> To: "Julien Jomier" <jjomier at cs.unc.edu>; <insight-users at itk.org>
> Sent: Thursday, July 08, 2004 6:59 PM
> Subject: Re: [Insight-users] Tif RGB wrong way around?
>
>
> > Thanks. I should have thought of trying that! I'll look for a mistake in
> my
> > code somewhere.
> >
> > JB
> >
> > ----- Original Message ----- 
> > From: "Julien Jomier" <jjomier at cs.unc.edu>
> > To: "'John Biddiscombe'" <jbiddiscombe at skippingmouse.co.uk>;
> > <insight-users at itk.org>
> > Sent: Thursday, July 08, 2004 6:47 PM
> > Subject: RE: [Insight-users] Tif RGB wrong way around?
> >
> >
> > Hi John,
> >
> > I just tried to read a RGB tiff image and write it as JPEG and BMP using
> ITK
> > and the resulting image appears to be valid so I guess the channels are
in
> > the correct order when reading the file.
> >
> > Hope this helps,
> >
> > Julien
> >
> > > -----Original Message-----
> > > From: insight-users-bounces at itk.org
> > > [mailto:insight-users-bounces at itk.org] On Behalf Of John Biddiscombe
> > > Sent: Thursday, July 08, 2004 12:56 PM
> > > To: insight-users at itk.org
> > > Subject: [Insight-users] Tif RGB wrong way around?
> > >
> > >
> > > I've connected itk::TiffImageIO to a vtk pipeline and found that when
> > > reading RGB colour images the data looks as though its GBR
> > > instead of RGB.
> > > Red and blue channels swapped. I notice that the Tif test in
> > > testing/code/io
> > > uses a black and white image with R=G=B channels so this wouldn't be
> > > spotted.
> > >
> > > Can anyone else easily check if TiffImageIO is getting R and
> > > B the wrong way
> > > around? It might be me passing the data into vtk, but since I'm using
> > > SetImportVoidPointer directly and not modifying the actual
> > > pixels, it should
> > > be the same as when it was read.
> > >
> > > thanks
> > >
> > > JB
> > >
> > > _______________________________________________
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> > > Insight-users at itk.org
> > > http://www.itk.org/mailman/listinfo/insight-users
> > >
> >
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