On 01/21/2011 11:42 AM, Daryl Herzmann wrote:
> Greetings matplotlib users,
>
> Firstly, thank you so much for a great python plotting library.  I use
> it daily and find the library very intuitive :)  My question deals
> with generating raster images at multiple scales without heavy code
> modification.  My work flow is to generate two versions of the same
> plot, one thumbnail (~ 320x320) and then one 'full size' around (~
> 800x800) in PNG format for the web.
>
> My current methodology is to generate a postscript file and then send
> it through ImageMagick's convert to generate the two different sized
> images.  I find that this works 'good enough for me', but I often run
> into problems when I have transparency in the plot and that
> information is lost in the translation of formats...  I also get
> fairly bulky file sizes, but that is probably my fault for not using
> the proper convert flags, anyway...
>
> I have tried messing around with the dpi and figsize settings to the
> initial: fig = plt.figure() and fig.savefig() , but I can't seem to
> get similiar quality to my hacky method outlined above.  Many times,
> the fonts look nasty :)

I don't know what would be causing that; we routinely generate png files 
directly from mpl for a thumbnail and a full-size figure, simply 
changing the dpi kwarg in savefig, and the results have been 
satisfactory. Can you post a simple script and pair of png files 
illustrating the problem?

(Here is a page of such thumbnails; clicking on one brings up the 
full-size version. 
http://currents.soest.hawaii.edu/uhdas_fromships/kilomoana/figs/)

Eric
>
> Any tips or tricks to make this happen?  Thanks again and I sincerely
> apologize if I missed a FAQ item , etc on this...
>
> daryl
>
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