Hello, As mentioned in the
> site(http://matplotlib.sourceforge.net/matplotlib.pylab.html#-savefig)
> dpi is the resolution in dots per inch. When we
> change dpi the size of the figure gets changed. But we
> want the resolution to be changed and not the figure
> size.
> Can anyone give more information on 'dpi' parameter.
The figure size in pixels is width*dpi by height*dpi. png is a raster
format which means it stores the information in a pixel buffer. You
cannot get higher resolution without changing the figure size in
pixels. If you want a higher resolution picture, set the dpi to a
higher number.
Alternatively, as others have suggested, use a vector output like PS
or SVG.
JPEG will not give you a better picture quality -- usually it will be
worse for lines and such.
JDH