Is there a way to convert image with R ? JPEG to GIF for example -

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i wish display images in tcltk window (not in r device) using r simpliest method (below) supports gif files : 

require(tcltk) tcl("image","create","photo", "imageid", file="a.gif") w <- tktoplevel() l <- ttklabel(w, image="imageid", compound="image") tkpack(l)

and files png/jpeg (file containing histograms generated program itself)

someone has idea conversion ?

thank you

despite warnings seems succeed:

 png("test.png")  plot(1,1)  dev.off() #quartz   #    2   library(png)  help(package="png")  img <- readpng("test.png")  str(img) # num [1:480, 1:480, 1:4] 1 1 1 1 1 1 1 1 1 1 ...  require(catools) #loading required package: catools  write.gif(img, "test.gif", scale="always") #----------------- warning message: in if (col == "jet") col = colorramppalette(c("#00007f", "blue",  :   condition has length > 1 , first element used

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