Jpeg.

On Mar 25, 2008, at 8:12 AM, Einar M. Einarsson wrote:

>
> 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
>
>
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