Re: [Matplotlib-users] Slow imshow when zooming or panning with several synced subplots

[Guillaume G. <gui...@mi...>]

Le 23/05/2012 15:04, Sergi Pons Freixes a écrit :
> On Wed, May 23, 2012 at 11:00 AM, Guillaume Gay
> <gui...@mi...>  wrote:
>> Hello
>>
>>
>> What is the size of a single image file? If they are very big, it is
>> better to do everything from processing to ploting at once for each file.
> As stated below, each image is single-channel, of 4600x3840 pixels. As
> you can see on the code, there is not much processing, just loading
> the images and plotting them. What it's slow is not the execution of
> the code, is the interactive zooming and panning once the plots "are
> in the screen".
>
>>> It's 15 images, single-channel, of 4600x3840 pixels each.
>> This is a lot of data.  8bit or 16bit ?
> They are floating point values (for example, from 0 to 45.xxx). If I
> understood correctly, setting the vmin and vmax, matplotlib should
> normalize the values to an appropriate number of bits.
>
>>> for f in filelist:
>> everything should happen in this loop
>>
>>>       dataset = ncdf.Dataset(os.path.join(sys.argv[1],f), 'r')
>>>       data.append(dataset.variables[variable][:])
>> instead of creating this big list, use a temporary array (which will be
>> overwritten)
>>>       dataset.close()
>>>       dates.append((f.split('_')[2][:-3],f.split('_')[1]))
> Why? It's true that this way at the beginning it eats a lot of RAM,
> but then it is released after each pop()
oh I didn't see the pop()...

So now then I don't know...

Do you have to show them full-scale? Maybe you can just use thumbnails 
of sort?

G.

> (and calculating the maximum
> of all the data without plotting is needed to use the same
> normalization level on all the plots). Anyway, the slowness ocurrs
> during the interaction of the plot, not during the execution of the
> code.
>
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