CODEWITHSUNDEEP
rimagemagick
Koushik Chowdhury
Koushik Chowdhury

Reputation: 63

Error running ImageMagick from R: Invalid Parameter - 80

I am using Windows 7 on a 32 bit computer. I have installed ImageMagick-7.0.4-4-Q16-x86-dll.exe. I have added path to ImageMagick in Path of Environmetal Variables. Using convert --version in command prompt shows ImageMagick correctly (but not when I run it in R using system()). Now, I try to make an animated gif file using the following R code (taken from another stackoverflow post):

    library(animation)
    ani.options('C:/Program Files/ImageMagick-7.0.4-Q16/convert.exe')
    dir.create("examples")
    setwd("examples")

    png(file="example%02d.png",width=200, height=200)
    for(i in c(10:1,"GO!")){
        plot.new()
        text(.5,.5,i,cex=6)
    }
    dev.off()

No error message shows as of yet. But when I write the following line:

    system("convert -delay 80 *.png example_1.gif")

it throws the following error:

Invalid parameter - 80 Warning message: running command 'convert -delay 80 *.png example_1.gif' had status 4

After this, I ran the following command

    system("convert --version")

and it throws the following error:

Invalid drive specification Warning message: running command 'convert --version' had status 4

I tried to solve this by running RStudio in administrator mode but in vain.

Upvotes: 0

Views: 1924

Answers (1)

Mark Setchell
Mark Setchell

Reputation: 207465

There is a Microsoft tool called CONVERT.EXE that has clashed with the ImageMagick tool of the same name for years.

Version 7 of ImageMagick has a new command-name, namely magick, which you can use in place of convert, identify mogrify and the other commands in the ImageMagick suite.

So,

identify image.png

becomes

magick identify image.png

And

convert image.png -resize 10x10 result.png

becomes

magick image.png -resize 10x10 result.png

  • Apart from that, you need to ensure that the PATH that R is using includes the directory that contains magick.exe.

  • You also need to ensure that the system() shell is running in the directory where your images are, so you can check where it is running like this:

    system("pwd")

  • If it is not running in the directory where your images are, you can either use an absolute path to your images (i.e. one that begins from the top of the drive, like "C:\User\Fred\FunkyImages\Image1.jpg") or you can change directory inside the system() command before you do your processing:

    system("cd somewhere && do something")

Upvotes: 3

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