On Wednesday, February 8, 2012, Jerzy Karczmarczuk <
jerzy.karczmarc...@unicaen.fr> wrote:
>
>> I am experiencing missing "segments" in the output of imshow()....
>>
>> Here is a minimal example:
>>
>> I have attached an example of the output. In theory, there should be
>> a continuous line from the left side of the picture to the right side.
>> The problem seems to occur across backends. Additionally, the
>> thickness of the segments is not uniform. Some are thinner than the
>> rest. Decreasing the value of N seems to make the issue go away.
>> Increasing the value of N makes the problem worse.
>>
>> Any ideas on what is going on and how I can fix it?
>>
> Imshow scales your geometry according to the figure size, and if you
> *insist* on having the "nearest" interpolation, you may lose pixels
> while drawing, it is as simple as that. No miracles.
>
> How to fix it?
> 1. Use bilinear, or sinc, or any smooth interpolation.
> 2. Make your figure big enough, say plt.figure(figsize=(14,14)).
>
> Jerzy Karczmarczuk
>
>
Agreed.
Your example above is basically the equivalent of rasterizing a line
(without anti-aliasing) and then down-scaling and possibly causing some
stretching due to changes in aspect ratio.
Because imshow() is unaware the you are actually drawing a line, the
backends can not take advantage of their "bag-o-tricks" to make it look
good.
Perhaps the example you provided was an oversimplified version of the
problem you are having?
Cheers!
Ben Root
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