Hi Michael
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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