[R] how to plot image() without painting a map (the background)

[Ptit_Bleu]

Hello,

In fact I would like to make something like a "movie" : to keep the map as
background and to display successively the temperatures pictures.

At the moment I create the picture of the temperature with R from latitude,
longitude, temperature data. I read that it can be done with image() so I
used this method.

So if I want to use your methods, I have to convert the picture created with
image() into a jpg (or an other format) picture.
Am I right ? If yes, what is the best way to perform this conversion ?

Thanks for your help,
Ptit Bleu.
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