I'd guess PNG won't get much smaller because you have a lot of different colored pixels. PNG compresses most when you have a sparser plot. I'd suggest that you try using JPG. It will compress the multi-colored portion of your plot way down. You may see a few artifacts if you look carefully at the axes: instead of pixels white,black,white you might get white,grey,black,grey,white.
> -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of > Einar M. Einarsson > Sent: Monday, March 17, 2008 5:08 AM > To: matplotlib-users@lists.sourceforge.net > Subject: [Matplotlib-users] PNG filesize > > > Hi all, > > I'm trying to find ways to make the file-size of my PNG images smaller. > > When I generate my 660*440px image I get a big 168kb file. > (8bit RGB color model, has an alpha channel (need that) but no > interlacing scheme) > > Here it is: > http://metphys.org/eme/T05.png > > I'm using the savefig method of-course. > > > To see how much I could compress it I used pngcrush (the best tool > according to the interwebs) and got it down to 128kb. > > But thats still way to large for my intended use. (plotting results > from an operational weather model, see. www.belgingur.is > We are currently using IDL.) > > From what I've read about PNG files, which is supposed to be rather > compact image format, it seems to me that the most effective way is > to have an indexed color table. > > So to cut it short: > > Is there any way to save a PNG file with an indexed color table? > > Or do you see any other way to shrink the files? > > > Best regards. > Einar M. Einarsson > www.belgingur.is > > ----------------------------------------------------------------------- > -- > This SF.net email is sponsored by: Microsoft > Defy all challenges. Microsoft(R) Visual Studio 2008. > http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ > _______________________________________________ > Matplotlib-users mailing list > Matplotlib-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/matplotlib-users ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
