auto-crop in ruby-vips

trim.rb

#!/usr/bin/env ruby

# "trim" is nnow built in, so this is easy

require 'vips'

im = Vips::Image.new_from_file(ARGV[0])

left, top, width, height = im.find_trim
im = im.crop(left, top, width, height)

im.write_to_file(ARGV[1])

Thanks @dkam, updated.

I can't get neither of these to work. is this still working for you? Using the image to test

It should work. Your test PNG image has a solid alpha, so find_trim cant see the edges.

Try:

#!/usr/bin/env ruby

require 'vips'

im = Vips::Image.new_from_file(ARGV[0])

left, top, width, height = im.find_trim background: 0
im = im.extract_area(left, top, width, height)

im.write_to_file(ARGV[1])

If I run:

$ vips flatten ~/pics/marble.png x.png
$ ./trim4.rb x.png y.png

I get:

thank you. hm. seems background: 0 did it. but the filesize is bigger after