Re: [Matplotlib-users] broken PNG files with GD backend

[John H. <jdh...@ac...>]

>>>>> "Kuzminski," == Kuzminski, Stefan R <SKu...@fa...> writes:

    Kuzminski> Now on to my specific problem.  I'm using the GD
    Kuzminski> backend on Windows with Matplotlib 0.41.  

First things first -- I haven't succeeded in getting the gd backend
compiled on windows.  If you have some expertise here and are willing
to share, or better yet build a gdmodule and gd installer that I can
put on the website, I would be very much obliged!  I contacted the
gdmodule maintainer some time ago over this issue and he had never
built it on windows either.  In my googling, I discovered the perl gd
module for windows and following their lead, succeeded in building gd
lib, but ran into some troubles (can't remember what) building
gdmodule.

    Kuzminski> If I set the dpi to over 60 the png file that gets
    Kuzminski> generated is 'empty', it's only 17 bytes long.  As soon
    Kuzminski> as I drop he DPI to below 65 or so, I get the image
    Kuzminski> file correctly.  This is with the simple_plot.py
    Kuzminski> example.

Now on to your problem. Is there a typo here?  You say over 60 is
empty and under 65 is ok ??  Can you send me a script which replicates
the problem, with the two calls to savefig, one which has the problem
and which does not.  Then I can begin to diagnose the problem; see if
it occurs under linux, see if it's a gd problem, see if it's a problem
on my end, etc....

Are you using matplotlib + GD for a web app server?  

John Hunter