Re: [matplotlib-devel] Seams in a grid of images

[Benjamin R. <ben...@ou...>]

On Thu, Jun 14, 2012 at 11:08 AM, tcb <the...@gm...> wrote:

> Hi,
>
> I'm trying to plot a grid of images with no spaces in between them and I
> have problems with the snapping. The grid is computed in data coordinates
> and the positions of the images are determined by the extents parameter
>
> ax.imshow(read_png(filename), extent=extent, snap=True)
>
>
> The images and extents are always the same size and each image starts
> where the last finished
>
> (x0, x0+dx, y0, y0+dy)
> (x0+dx, x0+2*dx, y0, y0+dy)
> etc...
>
>
> but it seems something happens in the backend (both QT4 and GTKAgg) and
> pixel seams are visible between the images at various zoom levels.
>
> It seems the ImageGrid was developed to fix this kind of problem, but I'm
> not sure I can adapt my plot to use ImageGrid. I want to draw stuff over my
> images and I need to position them in data coordinates.
>
> I've tried the snap=True parameter to imshow and it doesn't seem to affect
> the output.
>
> Does anyone have a simple solution to this problem which eliminates the
> seams?
>
> thanks,
>
>
>
Could you try out the latest version of matplotlib from the master branch?
There have been some work in this area in the past few months.  I don't
know if any of that work went into the recently announced v1.1.1-rc2.

Ben Root