Re: Loop into parametric plot or splot

[Daniel J S. <dan...@ie...>]

Brouard Nicolas wrote:
> Hi,
> I have been subscribed to gnuplot-dev some years ago and you could find
> my name in old archives concerning a patch on logscale (if I remember
> well).
> 
> I am back to your gnuplot-beta list, because I discovered your new gif
> animated function in 4.2 and 4.3 (I made a Mandriva rpm of your latest
> snapshot for my own use but I will submit it to Cooker soon if you don't
> see any objection).
> 
> You can have a look at the animations that I did for Wikipedia at
> http://commons.wikimedia.org/wiki/Image:Foucault-anim.gif but also at
> http://commons.wikimedia.org/wiki/Image:Foucault-rotz.gif . You can get
> the gnuplot sources in the description of theses pages. Any hint to
> improve the drawings? 
> 
> Also the mathematics are in fr.wikipedia.org/wiki/Pendule_de_Foucault
> but the size of the second drawing is too big (for the memory of
> commons, see http://bugzilla.wikimedia.org/show_bug.cgi?id=2888) and
> can't be processed easily. Another Wikipedian used Gimp in order to
> decrease the size of it and got a thumb, but now I uploaded a newer
> version and the thumb can't get through. Any hint to play with lower
> number of colors and reduced indexed colors.

Try

   gifsicle -O Foucault-anim.gif > anim.gif

which will reduce the color table from 256 to 16.  (You may use

   gifsicle --info Foucault-anim.gif
   gifsicle --info anim.gif

to verify this.  It reduces the file by maybe 5 to 10%.

What you will also see in the info is the size of successive images in the 
animation.  Although not much changes from frame to frame in your demo, GIF 
works with subimages so has to include the whole subimage that includes all 
parts of the image that change.

Nice demo though.

Dan