Cannot change resolution of output

[phil-martin-research]

Great work on the package, it's really useful.

I'm putting together a gif to use in a presentation but can't work out if I can alter the resolution of the output from gg_animate(). Ideally, I'd like to be able to have a full screen .gif that isn't grainy.

Is there any way to alter the resolution of outputs in gganimate?

[yeedle]

Use the ani.width and ani.height arguments. #10

[gedankenstuecke]

Small hint: this only works if you're not specifying a file to write to. Just had this issue. For example gg_animate(plot,"output.mp4",ani.width=800, ani.height=400) will fail with an error.

For this you'll have to specify the width & height in ani.options, e.g.

ani.options(ani.width=800, ani.height=400)
gg_animate(plot,"output.mp4") 

Happy to update the docs to reflect that if that's wished.

[yeedle]

@gedankenstuecke, first, if you explicitly specify the filename argument it will work.

gg_animate(plot, filname = "output.mp4", ani.width=800, ani.height=400)

Alternatively, you can pass in the filename as the last argument, and it will work as well.

gg_animate(plot, ani.width=800, ani.height=400, "output.mp4")

[gedankenstuecke]

Ah, thanks! Then nevermind!

[jrosen48]

Hmm, I tried this, and got the following error message:

>gganimate(gg, filename = "test.gif", ani.width=1000, ani.height=800)
Error in check.options(new, name.opt = ".X11.Options", envir = .X11env) : 
  invalid argument names ‘ani.width’, ‘ani.height’ in 'grDevices::png(..., res = dpi, units = "in")'

[yeedle]

Yes, gganimate was updated since then. Instead, try this:

animation::ani.options(ani.width = 1000, ani.height = 800)
gganimate(gg, filename = "test.gif")

[xgirouxb]

AFAIK, given that the default for grDevices::png() is 72 ppi, adjusting the number of pixels (via ani.width and ani.height) used to draw an image only defines the dimensions of the output, not the resolution of the output. I fiddled around quite a bit and my outputs always seemed way too grainy. I googled around and found the following solution using the ani.res argument:

animation::ani.options(ani.width = 1000, ani.height = 800, ani.res = 300)
gganimate(gg, filename = "test.gif")

While this works great for me, the solution isn't obvious because ani.res is not listed in the documentation currently hosted on CRAN (dated 2017-03-30). It seems that the argument is brand new and is only included in the latest update of the animation package (rolled out a month ago). See the following conversation and feature request: yihui/animation#99

[dgrtwo]

We are finishing a complete rewrite of gganimate undertaken by Thomas Pedersen, with massive breaking changes to the API (this will come with a version bump to 1.0.0; currently 0.9.9.9999). This fixes many existing bugs and installation difficulties, and offers a more intuitive grammar of graphics.

As a result I'm closing almost all open issues, since they aren't relevant to the new version (bug reports in particular no longer apply). I apologize for any inconvenience in updating your existing code, but the new version of gganimate will be well worth the effort.

• If you are still interested in this issue and believe it is relevant to the new version of gganimate, you can reopen it!

• If you'd like to continue using the old gganimate version (which we do not recommend, as it will not be maintained), you can install from this release using the following code:

  devtools::install_github("dgrtwo/gganimate", ref = "v0.1.1”)