Get info of applied image manipulation

Question

I am using gm for node. I would like know the equivalent Javascript of the ImageMagick CLI command:

convert /path/to/source.png -format "%@" info:-

This will output the trim data, resulting in something like:

2672x3579+1115+725

I initially assumed the gm equivalent would be:

gm('/path/to/source.png').identify('%@', (err, result) => {
  console.log(result)
})

But this just returns the source file size without trimming whitespace.

5000x5000+0+0

score 2 · Answer 1 · answered Jan 17 '17 at 08:19

2

Try it this way:

gm convert a.png -format "%@" info:-

Or this way:

gm convert a.png -trim -format "%w %h" info:-

answered Jan 17 '17 at 08:19

Mark Setchell

Sorry. I don't speak JS - I was hoping that someone else might be able to help out with the other half of the answer if I provided the half I know. – Mark Setchell Jan 17 '17 at 10:03

score 1 · Accepted Answer · answered Jan 17 '17 at 17:26

1

I figured it out.

gm('/path/to/source.png')
  .in('-format', '%@')
  .write('info:-', (err, result) => {
    console.log(result)
  })

The writing to info:- was the aha moment.

answered Jan 17 '17 at 17:26

Colin Meinke

Well done and +1 for sharing. I have also fallen foul of `gm` requiring that extra dash at the end! – Mark Setchell Jan 17 '17 at 18:22

2 Answers2