]> Hello, all-- I am trying to learn the OCamlplot API, and as a first step I have written a simple program that is supposed to generate a PNG image with a single colored rectangle (see code below). Well, the output is indeed a PNG image, but there is no colored rectangle; the image is just solid white. And apparently the image's colorspace is a 1-bit grayscale: bash-2.05a$ file /var/tmp/test.png /var/tmp/test.png: PNG image data, 570 x 570, 1-bit grayscale,\ non-interlaced (? 1-bit grayscale? Didn't know there was such a thing. Doesn't 1-bit mean monochrome by definition?) I have been looking through the libplot documentation, and I can't find anything about colorspace. I suppose I must be missing some simple step in my program. Any ideas what the problem is? [ I'm running OCaml 3.06 on Debian GNU/Linux 3.0, with ocamlplot 0.4 and libplot 2.4.1 ] Here's the code: ------ tryplot.ml --------------------------------------------------- let out = open_out "/var/tmp/test.png" in let pl = Plot.makepl Plot.PNG out [] in Plot.openpl pl; Plot.pencolor pl (Plot.Colorname "blue"); Plot.fillcolor pl (Plot.Colorname "red"); Plot.linewidth pl 2.; Plot.filltype pl 1; (* let pt0 = { Plot.x = 20. ; Plot.y = 20. } and pt1 = { Plot.x = 300. ; Plot.y = 200. } in Plot.box pl ~p0:pt0 ~p1:pt1; *) Plot.fbox pl 20. 20. 300. 200.; Plot.closepl pl; Plot.deletepl pl; close_out out --------------------------------------------------------------------- -- Matt Gushee When a nation follows the Way, Englewood, Colorado, USA Horses bear manure through mgushee@havenrock.com its fields; http://www.havenrock.com/ When a nation ignores the Way, Horses bear soldiers through its streets. --Lao Tzu (Peter Merel, trans.) ------------------- To unsubscribe, mail caml-list-request@inria.fr Archives: http://caml.inria.fr Bug reports: http://caml.inria.fr/bin/caml-bugs FAQ: http://caml.inria.fr/FAQ/ Beginner's list: http://groups.yahoo.com/group/ocaml_beginners