Improve repr of image bytes

[banesullivan]

When using getThumbnail() or getTile() in ipython/Jupyter, the bytes repr output can be overbearing and not all that useful as the image bytes can overtake the output with very long amounts of data.

These changes add a wrapper class to the bytes object for when we are returning PNG, JPEG, or TIFF image data (to give more user-friendly outputs in ipython and show an actual preview of the image in Jupyter

This is incredibly useful when trying to debug the graphical outputs of these methods.

master

In [1]: import large_image

In [2]: src = large_image.open('co_elevation.tif', projection='EPSG:3857')

In [3]: thumb, mime = src.getThumbnail()

In [4]: thumb
Out[4]: b'\xff\xd8\xff\xe0\x00\x10JFIF\x00\x01\x01\x00\x00\x01\x00\x01\x00\x00\xff\xdb\x00C\x00\x02\x01\x01\x01\x01\x01\x02\x01\x01\x01\x02\x
... (really long bytes output)

This branch

In [1]: import large_image

In [2]: src = large_image.open('co_elevation.tif', projection='EPSG:3857')

In [3]: thumb, mime = src.getThumbnail()

In [4]: thumb
Out[4]: ImageBytes<16194> (image/jpeg)

Jupyter

master	this branch

Similarly works with getTile():

In [1]: import large_image

In [2]: src = large_image.open('co_elevation.tif',  encoding='PNG')

In [3]: tile = src.getTile(0,0,0)

In [4]: tile
Out[4]: ImageBytes<30086> (image/png)

In [5]:

TIFF encodings simply repr out in Jupyter:

[banesullivan]

Linting is failing due to flake8 5.0.0 release. See gforcada/flake8-isort#115

Other CI failures are due to a utf8 decoding error which I am also seeing on master. Not sure what's going on there.

[manthey]

This is great.

I think the other CI failure is because Glymur pushed a new version. Once that clears, if flake8-isort hasn't been updated, I'll pin it so CI passes.

[manthey]

If you rebase from or merge master, I think CI will pass (or at least be relevant).

[banesullivan]

Oof, even more test failures coming from the converter

[manthey]

There was a type() check rather than an isinstance check.

[manthey]

The CI is still failing, but passes locally. I'll ssh in to circle to try to figure it out.

[banesullivan]

Thank you for finalizing this, @manthey!