Situation

I have an iOS app in which users can draw lines on images with PencilKit. The way I implemented is that create a canvas on top of an image that a user has chosen, then the canvas and the image are converted into one image.

Problem

The way it does decreases the resolution of the concatenated image a little bit, and I don't think it isn't the best way to do so.

What I want

I want something like the markup feature which we can use as the default when we edit photos on iOS.

Questions

• Is it possible to implement the markup feature to my app? If so, how would you implement that?
• Is there any better way, github repos, and any tips?

Thanks.