Lisandro has written some code in PETSc that writes such files. He has
written it as a way to save images from PETSc graphics to files but it may be
possible to extend and use for your purposes without too much difficulty.
The code is in src/sys/classes/draw/utils/image.c
If you add, for example, reading such files and other processing we would
be very happy to accept it in a pull request.
Barry
> On Oct 14, 2016, at 9:20 AM, Laurent Hoeltgen <hoelt...@b-tu.de> wrote:
>
> Hi all,
>
> does petsc provide some functionality to read images files (png, pgm, jpg,
> ...) and also to write such files? I’d like to do some low level image
> processing tasks where I need direct access to the pixel values. So anything
> that gives me a vector or matrix with this data would be perfect.
>
> Best regards,
> Laurent
>
> % ------------------------------------------------------------- %
> Dr. Laurent Hoeltgen
>
> Chair for Applied Mathematics
> Brandenburg University of Technology
> Platz der Deutschen Einheit 1, HG 3.26
> 03046 Cottbus, Germany
>
> Email: hoelt...@b-tu.de
> Web. http://www-user.tu-cottbus.de/~hoeltgen/
> Tel. +49 (0) 355 69 20 77
> Fax. +49 (0) 355 69 27 10
> % ------------------------------------------------------------- %
>
>
