Re: [Plplot-devel] x20c.c

[<jca...@in...>]

On Monday 26 November 2001 20:43, Alan W. Irwin wrote:
| I have a suggestion.  Why not add a function to this demo to input
| various image formats and extract the information required by
| plimage? Right now, there is rudimentary support for reading ppm
| images from x20c.c, and I suggest replacing this with the
| appropriate calls to libpbm, libpgm, libpnm, or libppm.

I have no strong objections to that, except that x20c will depend on=20
libraries that may not be available on some other systems. In the=20
first place, unix is not linux, plplot runs also on Macs and=20
MSWindows, and the purpose of a demo is just showing a capability.=20
That's the reason why I spend some time coding the reading of the=20
image, instead of just calling a library. (After all it looks like=20
that I have objections ;-)

Joao

|  I have
| never used those free libraries directly, but the license (as
| interpreted by the Debian copyright notice) puts no restrictions
| whatsoever on our code, and it is the library used by the huge
| number of linux image converters.  Also, use of these libraries
| (which come with the netpbm package, see
| http://netpbm.sourceforge.net/netpbm.html#lbAM) means you have
| direct read access to pbm, pgm, pnm, or ppm images from your C
| code. Furthermore, from the C code you could invoke the the free
| image converter with the system command that was appropriate (e.g.,
| pngtopnm, jpegtopnm, tifftopnm, pstopnm, and many more or indeed
| anytopnm which is a superset of all of them) to convert a given
| format to pnm which can then be read into x20c using libpnm.
|
| If there are no objections to this way to have access to many
| different image formats, I am willing to give this a try.
|
| Alan
|
|
| email: ir...@be...
| phone: 250-727-2902=09FAX: 250-721-7715
| snail-mail:
| Dr. Alan W. Irwin
| Department of Physics and Astronomy,
| University of Victoria, P.O. Box 3055,
| Victoria, British Columbia, Canada, V8W 3P6
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