How can I make progressive images?

[yyyyeeeeesss]

How can I make progressive images?

I use

local image = assert(magick.load_image('my_photo.jpg'))
image:set_interlace_scheme('PlaneInterlace')
ngx.say(image:get_blob())
ngx.exit(ngx.OK)

but this service http://highloadtools.com/progressivejpeg put no prograssive image.

[ivakinpavel]

I found that you, Leafo, made a great work! your bindings faster than pure C (can be find on github) for about 20%!
but i can use it bc i really need progressive jpegs. Can you pls spend some time and look at this issue?