[Insight-developers] Adding PPM (and PBM/PGM)

[Bill Lorensen]

Actually, if I recall, ppm also supports pgm (portable gray map) and
pbm (portable bit map). There is a newer format, pam, supported. The
header is really simple. Maybe these formats (excepting pam) could be
read directly without the netpbm library. There also may have been
support for 16 bits.

Bill

On Mon, Aug 11, 2008 at 12:29 PM, kent williams
<norman-k-williams at uiowa.edu> wrote:
> We are in the process of converting an existing application suite to use ITK
> instead of the library of home-made functions it currently uses.  One of the
> tasks Hans has asked me to work on is to create an itk::ImageIO class that
> reads and writes PPM files to contribute to ITK.
>
> I have a couple of questions.
>
> 1. There is an existing library for reading/writing PPM files -- netpbm.
> This is one of those old-school, sprawling packages with dozens of programs,
> covered by a confusing variety of licenses.  Luckily it appears that the
> library code needed to read and write PPM files is fairly compact and in the
> public domain.
>
> Would it be OK to include this library source in order to support the
> PPMImageIO class?  I would of course first submit this as an Insight Journal
> article.  The library itself is public domain, compact, portable, and
> stable.
>
> 2. PPM is 2D only, and RGB only. I know there is pixel conversion code in
> ITK, but how should an ImageIO class behave if it is asked to write a 3D
> image when the image format only supports 2D?
>
> The one example of a similar reader is itk::JPEGImageIO.h but it seems to be
> pretty incomplete -- it looks like it doesn't pay any attention to the
> requested pixel type in the Read method, and just assumes it will be 8 bit
> pixels.
>
>
>
>
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