[Request] Add .APNG/.MNG support?

[Nandaka]

Any support for Animated PNG or MNG with custom duration for each frame similar to GIF?

[almarklein]

Both are currently not supported. Both are based on PNG so they are both feasible. Pure Python png reader/writers exist. Some links:

• Simple pure Python PNG read/write functionality https://github.com/zoofIO/flexx/blob/master/flexx/util/png.py
• APNG support via Pillow https://pypi.python.org/pypi/apng/0.1.0
• Cannot find anything for MNG, but provided its well documented I can imagine that its a matter of extending an existing PNG implementation.

[Nandaka]

thanks, I'll use apng for now.

[Nandaka]

Sorry for late reply

https://github.com/zoofIO/flexx/blob/master/flexx/util/png.py

This only support limited format of png (Can only read PNG's that are not interlaced, have a bit depth of 8, and are either RGB or RGBA.)

APNG

This only support python3, but I"m able to convert it to 2.7.x using 3to2 script with some modification. apng.zip

[WarrenWeckesser]

FYI: Another alternative for writing (but not reading) animated PNGs is numpngw: https://github.com/WarrenWeckesser/numpngw, https://pypi.python.org/pypi/numpngw

[FirefoxMetzger]

As of now, ImageIO can write APNGs, and read single frame from it:

import imageio as iio
import numpy as np

img = iio.v3.imread("imageio:newtonscradle.gif", index=None)
iio.v3.imwrite("test.apng", img)

read_back = iio.v3.imread("test.apng", index=8)

Reading the full stack (index=None) throws an exception, and I will have to investigate if this is something we are doing or an area where pillow has a bug.

EDIT: Turns out this is a bug in our code and will be fixed by https://github.com/imageio/imageio/pull/750.

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Regarding the MNG format, I don't think we support it at present. I tried it, but all plugins I have installed at the moment reject writing mng. I can't test reading, because I don't have a file in that format on hand (donations welcome :) ).

I did find https://github.com/emcconville/wand as a wrapper around imagemagick which claims to support MNG and JNG. Currently, we don't wrap this library so I can't say if that would solve the problem, but it at least provides a direction.