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

[tcb <the...@gm...>]

On Thu, Jun 14, 2012 at 4:12 PM, Benjamin Root <ben...@ou...> wrote:

>
>
> 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
>
>
hi,

I'm using the latest version from git.

Any idea what patches are part of that work? or even which
classes/functions were touched?

thanks,