[scikit-image] IO documentation

[Stefan van der Walt]

On Tue, Feb 21, 2017, at 23:38, Stefan van der Walt wrote:

> Hi Michael



Apologies, Michal.



> On Thu, Jan 5, 2017, at 01:45, Michal Romaniuk wrote:

>> The IO documentation doesn't seem to be very good. It explains how
>> plugins work but it's scarce on examples e.g. on how to export jpeg
>> image with a specified compression level. The IO API docs don't give
>> much detail either. Some details can be found in the docs for
>> external.tifffile but it takes some searching to find it. For PIL the
>> only way to figure out how to use it seems to be looking at the
>> source code - no modern docs as far as I can tell (did I fail to use
>> Google properly?).
> 

> Thanks for your comment; unfortunately io.imsave does not currently
> support specifying compression level (that is only supported for
> TIFF files).
> 

> That said, you can accomplish this yourself using PIL:

> 

> In [1]: from skimage.io._plugins.pil_plugin import ndarray_to_pil

> In [2]: from skimage import data

> In [3]: img = data.chelsea()

> In [4]: pil_img = ndarray_to_pil(img)

> In [5]: pil_img.save('/tmp/chelsea0.jpg', quality=10)

> In [6]: pil_img.save('/tmp/chelsea1.jpg', quality=90)

> 

> In [7]: !du -hcs /tmp/chelsea*.jpg

> 8.0K /tmp/chelsea0.jpg

> 36K /tmp/chelsea1.jpg

> 

> Best regards

> Stéfan

> 
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