Re: [Matplotlib-users] how can i raise the dpi without changing the dimensions of my picture?

[Chad K. <cck...@gm...>]

Let me see if I understand this right, you want to leave the image
dimensions, in inches, constant while increasing the resolution in DPI to
get a sharper image.  Did I get that correct?

If you like the way the image appears on screen, use the DPI argument to
savefig().  My experience is that if you change the DPI when creating the
figure, that will change the layout.

What it sounds like you are seeing is that when you crank the DPI up, the
PNG you created does not change its listed DPI, and displays larger.  I
checked on my system, matplotlib 1.1.1, and it is updating the DPI in the
PNG files.

My question back to you is, why does it matter?  Most layout programs will
let you set the physical size of the figure and scale the DPI to match.
On Nov 16, 2013 3:06 PM, "Bradley Coleman" <col...@se...> wrote:

> Hi there, I make a figure, then I do some stuff, then I save the figure.
>
> stuff
> fig = figure(figsize = (0.75, 3.5))
> stuff
> fig.savefig(‘name.png’, bbox_inches='tight')
>
> My figure is perfect, but I'm having trouble increasing the resolution.
> There are two ways that I can figure out to do that, one is send a dpi as
> an
> argument to figure() and the other to savefig().  Sending it to figure()
> doesn’t change the file at all, so I'm not sure what it does, but sending
> it
> to savefig() does change the file.  When I send dpi to savefig(), like
> dpi=500, the resolution seems to get much better, and the file size grows,
> but the problem is that the height and width of the picture grows too.  I
> want the resolution to go up, but not the height and width of the picture.
> What can I do?
>
> Thanks!
> Bradley
>
>
>
>
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