P M, Claus, Antoine, Christophe; Federico:Thank you all fior your multifaceted and interesting suggestions. A special mention to Christophe: the pages on the SVG format are extremely clear; in my opinion, they deserve a wide audience and should be translated in English.
I now understand that I should have described my ultimate goal, even though it is somewhat complicated.. My aim is to emulate image reconstruction in X-ray tomography. In the simplest reconstruction algorithm, back projection, one must darken the image plane proportional to the value of a "projection" of the object, for each projection direction (at least 128 in all). These "darkenings" must add everywhere in the image plane. A sketch of this process is shown in the attached figure.
I have found two other possible approaches. In thee book by Michel Goossens et al (the Latex graphics companion) there appears (pp 257-258) a Latex program that emulates transparency. To use this , I would have to read into pstricks the coordinates of the various rectangles, which seems possible. Moreover, I have read that PDF supports transparency, though I have no idea how this fact could be exploited in Scilab.
I have quie a lot of home work to do! Thank you again for your help. JP Grivet
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