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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