Re: [matplotlib-devel] blurry images at native resolution with images.BboxImage: patch to fix

[Daniel H. <dh...@gm...>]

On this topic, I have a patch that tells BboxImage whether or not to
always apply interpolation (as is the desire when doing data analysis)
or to apply interpolation only when the image is at a non-native
resolution (as is the desire when using an image to annotate
something).

The pull request is here:


Since we cannot attach files on github, I've attached the test script,
image file that I was using, and the before/after here.

And can the max post size be increased on matplotlib-users, so that
when even smallish images are attached, the messages don't go into
moderation?

On Thu, Oct 13, 2011 at 11:40 AM, Daniel Hyams <dh...@gm...> wrote:
> Ah yes, I forget :/  I was focused on images as being "pure" things that
> should be displayed, and forgot about the image processing angle.
> So would the solution be a keyword argument that tells imshow/BboxImage and
> friends not to interpolate when at native resolution, which is set to the
> current behavior as default?
> If that's not an acceptable solution, I can just leave the patch in my own
> personal code and not worry about any further...I thought that I was fixing
> a bug there :)
>
> I guess the main difference is whether the image is treated as sacred and
> should be displayed perfectly when possible, versus the ability to modify
> the picture on purpose via the interpolations, for whatever reason the user
> wants.  Understandably, matplotlib has taken the latter approach, because
> the context has always been (as far as I can tell from the examples)
> displaying the pixels for a scientific purpose.  However, when you want to
> display an image for a annotational type purpose, the former approach should
> be taken, in my opinion.
>
>
> On Thu, Oct 13, 2011 at 11:13 AM, John Hunter <jd...@gm...> wrote:
>>
>> On Thu, Oct 13, 2011 at 10:06 AM, Daniel Hyams <dh...@gm...> wrote:
>>
>> > Isn't the purpose of interpolation to handle situations where the image
>> > is
>> > being displayed at a different size than its native resolution?  It
>> > seems
>>
>> Not solely, it can also be used to do local average of noisy images to
>> get a smoother view, eg bilinear or bicubic averaging of neighboring
>> pixels.
>
>
>
> --
> Daniel Hyams
> dh...@gm...
>



-- 
Daniel Hyams
dh...@gm...