Returning an image from the viewer

[Tony Yu]

On Mon, Oct 28, 2013 at 6:25 PM, Josh Warner <silvertrumpet999 at gmail.com>wrote:

> There was some discussion about the save functionality in the original PR.
> I admit, I advocated to change "File -> Save As" from saving the overlay to
> saving the actual image the user sees... so feel free to send some blame
> for the present behavior my way.
>
> There should be an option to add a Save Overlay *button* which should
> allow you to grab the overlay specifically. As to your second question: I
> think you can send data either to a file, or to a buffer which can be read
> out using `skimage.io.pop`. I've used this before, but my memory is a bit
> fuzzy on it now. If this isn't currently available for scripting like your
> hoped-for functionality example, I'm sure it could be implemented.
>
> Thanks for the PR fixing the save dialog if it's RGB!
>
>
> On Monday, October 28, 2013 2:19:03 AM UTC-5, Juan Nunez-Iglesias wrote:
>>
>> Hi all, but especially @tonysyu:
>>
>> I'm using the viewer for the first time to add some interactivity to my
>> work. Please forgive the noobish-ness: I've only ever worked on
>> command-line stuff. (Thanks btw to @tonysyu for his awesome SciPy lightning
>> talk, which inspired me to even dip my toes in this!)
>>
>> I'm running an RGB image through a bunch of thresholding and
>> morphological operations, and I want to fiddle with the parameters before
>> getting back the filter output. I'm running into the following problems:
>>
>> 1) The file > save as dialog saves a composite image of the overlay and
>> underlying image, where I just want the overlay.
>> 2) The file > save as dialog actually crashes when the underlying image
>> is RGB! (PR forthcoming)
>> 3) But most of all, I don't actually want to save the overlay, I just
>> want to return it to the calling process. How would one go about this?
>> Here's my code now:
>>
>> v = viewer.ImageViewer(rgbs[0])
>> v += CentroPlugin()
>> v.show()
>>
>>
>> which works as expected. I'd like something like:
>>
>> v = viewer.ImageViewer(rgbs[0])
>> v += CentroPlugin()
>> overlay = v.show()
>>
>> Is this possible?
>>
>
I'm sure this is possible, but I'd have to think a bit about the right way
to implement this. Currently, the viewer knows very little about the
plugins, and overlays are drawn in a different layer than the image. It's
definitely possible to retrieve the overlay from the viewer object, but I'm
not sure how to do it cleanly.

That said, I don't know why I didn't think to return an image from the
viewer. Thanks for the idea:

https://github.com/scikit-image/scikit-image/pull/805

-T


>
>> Thanks,
>>
>> Juan.
>>
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