Re: [Plplot-devel] x20c.c

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

On Tuesday 27 November 2001 21:23, Alan W. Irwin wrote:
| On Tue, 27 Nov 2001, Alan W. Irwin wrote:
| > (png
| > format also has the truecolour alternative, but we must avoid
| > that because plplot would not be able to work with it.) I have
| > just found that the combination of pnmquant and pnmtopng does
| > produce the colour-pallete style png format.  Now I have done
| > little coding yet, but from the documentation it looks like the
| > colour pallette is accessible using the libgd library so that for
| > the cost of ~15 extra lines of code in x20c we can demonstrate
| > processing a colour image.  With a few lines of commentary in
| > x20c.c we can also advise all our Linux users how to use the
| > netpbm utilities to transform *any* of their favorite colour
| > images into a png image with colour palette that the ~15 lines of
| > libgd-related code in x20c.c could understand.
|
| Correction: I have just discovered the gdImageTrueColorToPalette
| function in libgd which translates an image from truecolour to
| palette.  So strike my comments about netpbm.  Everything we need
| to process colour png images of any type is already in libgd.

But I had to compile my libgd, because Suse-7.0 didn't have it!
We have irreconciliable opinions in this respect.

Joao