"""Utility for creating a GIF.
"""
"""
Copyright 2017 Parag K. Mital. See also NOTICE.md.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
"""
import numpy as np
import matplotlib.pyplot as plt
import matplotlib.animation as animation
[docs]def build_gif(imgs, interval=0.1, dpi=72,
save_gif=True, saveto='animation.gif',
show_gif=False, cmap=None):
"""Take an array or list of images and create a GIF.
Parameters
----------
imgs : np.ndarray or list
List of images to create a GIF of
interval : float, optional
Spacing in seconds between successive images.
dpi : int, optional
Dots per inch.
save_gif : bool, optional
Whether or not to save the GIF.
saveto : str, optional
Filename of GIF to save.
show_gif : bool, optional
Whether or not to render the GIF using plt.
cmap : None, optional
Optional colormap to apply to the images.
Returns
-------
ani : matplotlib.animation.ArtistAnimation
The artist animation from matplotlib. Likely not useful.
"""
imgs = np.asarray(imgs)
h, w, *c = imgs[0].shape
fig, ax = plt.subplots(figsize=(np.round(w / dpi), np.round(h / dpi)))
fig.subplots_adjust(bottom=0)
fig.subplots_adjust(top=1)
fig.subplots_adjust(right=1)
fig.subplots_adjust(left=0)
ax.set_axis_off()
if cmap is not None:
axs = list(map(lambda x: [
ax.imshow(x, cmap=cmap)], imgs))
else:
axs = list(map(lambda x: [
ax.imshow(x)], imgs))
ani = animation.ArtistAnimation(
fig, axs, interval=interval * 1000, repeat_delay=0, blit=True)
if save_gif:
ani.save(saveto, writer='imagemagick', dpi=dpi)
if show_gif:
plt.show()
else:
plt.close(fig)
return ani