adjoin

[saberistic]

I am having difficulty using adjoin, I am trying to get

gm convert '1.pdf[0-5]' +adjoin output-%03d.png

and when I do

gm(this.fileAddress + '[' + pageNumber + ']').adjoin().write(outputAddress + '/output-%03d.png', (err, stdout, stderr, cmd) => {
     console.log(err);
     console.log(stdout);
     console.log(stderr);
     console.log(cmd);
   });

I get

gm "convert" "/home/amirsaber/Desktop/testgm/1.pdf[0]" "-adjoin" "/home/amirsaber/Desktop/testgm/output-%03d.png"

is there any special reason that you do -adjoin instead of +adjoin