Ability to pass in jimp object instead of image url

[skosito]

Hey,

I am using this package in react app, and would like to pass in jimp object that was already preprocessed to replace color util as alternative to url to image (keep both options ofc). Jimp can not write to output when used on client side (or at least I could not make it work), so writing and reading again is not solution for me just to use this tool's interface.
I can fork this and adapt to my needs, just wanted to check if there are some restrictions to this, and if this would be useful to you, I can create PR for it?