Default animation.convert_args to ["-layers", "OptimizePlus"].

anntzer · anntzer · commit 2ed5944fd790 · 2022-06-30T00:07:14.000+02:00
On the simple_anim.py example, adding e.g.
```
plt.rcParams["animation.writer"] = "imagemagick"
plt.rcParams["animation.convert_args"] = []
ani.save("old.gif")
plt.rcParams["animation.convert_args"] = ["-layers", "OptimizePlus"]
ani.save("new.gif")
```
shows that OptimizePlus yields a &gt;2.5x decrease in gif size.
diff --git a/doc/api/next_api_changes/behavior/23371-AL.rst b/doc/api/next_api_changes/behavior/23371-AL.rst
@@ -0,0 +1,4 @@
+The default ``rcParams["animation.convert_args"]`` changed
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+It now defaults to ``["-layers", "OptimizePlus"]`` to try to generate smaller
+GIFs.  Set it back to an empty list to recover the previous behavior.
diff --git a/lib/matplotlib/mpl-data/matplotlibrc b/lib/matplotlib/mpl-data/matplotlibrc
@@ -779,7 +779,7 @@
 ## ImageMagick in the registry (as convert is also the name of a system tool).
 #animation.convert_path: convert
 ## Additional arguments to pass to convert.
-#animation.convert_args:
+#animation.convert_args: -layers, OptimizePlus
 #
 #animation.embed_limit:  20.0     # Limit, in MB, of size of base64 encoded
                                   # animation in HTML (i.e. IPython notebook)

Original file line number	Diff line number	Diff line change
`@@ -779,7 +779,7 @@`
`779`	`779`	`## ImageMagick in the registry (as convert is also the name of a system tool).`
`780`	`780`	`#animation.convert_path: convert`
`781`	`781`	`## Additional arguments to pass to convert.`
`782`		`-#animation.convert_args:`
	`782`	`+#animation.convert_args: -layers, OptimizePlus`
`783`	`783`	`#`
`784`	`784`	`#animation.embed_limit: 20.0 # Limit, in MB, of size of base64 encoded`
`785`	`785`	`# animation in HTML (i.e. IPython notebook)`