[Matplotlib-users] How to save file in to image in desired resolution in matplotlib?

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Dear All,
               I am using one image of 235X130 and plotting the curve on it,
now when i save it it goes  in the resoltuion  of 800X600,
I want to keep the resolution intact.What can be done for that to keep the
resolution same?
I am using
savefig('/home/jaguar/Softwares/Development/Python/bunty.png')
Thanks in advance!
Regards
Yogesh