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`imread`, `imwrite` support for 16bit .png images

See original GitHub issue

If I understood correctly, imageio implements 16bit .png support via freeimage plugin. The question is: is it possible to force read/write in 16bit? Looking at the code I haven’t found an easy way to do so.

See https://github.com/scikit-image/scikit-image/issues/2436.

Issue Analytics

State:
Created 7 years ago
Comments:13 (7 by maintainers)

Top GitHub Comments

4reactions

almarkleincommented, May 27, 2017

# read with Pillow
imageio.imread('imageio:chelsea.png', 'PNG-PIL')
# read with FreeImage
imageio.imread('imageio:chelsea.png', 'PNG-FI')

4reactions

soupaultcommented, Jan 10, 2017

@almarklein I see, thanks!

And what about multichannel images?

In [19]: im1 = np.zeros((3,3,3), np.uint16)
    ...: im1[0,0] = 1000
    ...: 
    ...: imageio.imsave('im16.png', im1)
    ...: im2 = imageio.imread('im16.png')
    ...: 
/usr/lib/python3.6/site-packages/imageio/core/util.py:81: UserWarning: Lossy conversion from uint16 to uint8, loosing 8 bits of resolution
  warn('Lossy conversion from uint16 to uint8, '

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