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List:       vtkusers
Subject:    Re: [vtkusers] Loading images from memory *not files*
From:       Robert Haines <rhaines () manchester ! ac ! uk>
Date:       2010-02-24 13:35:39
Message-ID: 3B33433B-A53C-4E37-B10C-6CF5043B7C44 () manchester ! ac ! uk
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> PNG is a file format and PNGReader implements it. Nothing crazy here.

No, PNG is a data format. A PNG file is simply a file with that data format in it. I \
have some PNG data in memory that I would like to decode and use rather than load it \
from a file. Given that when you load a PNG file you would load it into memory to \
decode it I was hoping that you could do that with PNGReader or similar, that's why I \
thought I was going crazy when I thought that the only way of loading PNG data into \
vtk was to have it in a file on disk.

So my question was, can I do this with vtk?

> You need to create a vtkImage and populate its data via write pointer.

I can't see a vtkImage class (5.4.0) but if I was to use something like that \
(vtkImageData?) then it looks like I would have to do the PNG decode myself. Is that \
right? Even when vtk already links libpng and can do this if it's in a file?

Cheers,
Rob

> Robert Haines wrote:
> > Hi all,
> > 
> > Subject says it all really. I have an image (a PNG in this case but I'd like to \
> > be general here really) in memory and I'd like to use it in the normal VTK way - \
> > as if it had been read in by vtkPNGReader, for example. Is this possible? I've \
> > looked at the code for vtkPNGReader and it looks like the only way to read a PNG \
> > is from a file, which seems crazy! Have I missed something? Is there another way \
> > to do what I want? 
> > Thank you,
> > Rob

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