How to have a sketch from a photo(JPG)?

[Shih]

In the photo, I want to have s sketch of the seedling. Then use the sketch somewhere else.  The only way I can think of is to use Pen Tool to create another layer. But are there any more efficient way?

If I use pen tool to sketch the seedling, it's easier with a white background. Can I use "adjustment" to make the background white or transparent?

 

  

[firstdefence]

1. Crop the image to the plant pot of seedling
2. Use Filters > Detect > Detect edges
3. Use Layer > Invert
4. Use Filters > Colours > Monochrome Dither.

You should end up with something like this

[Shih]

Thanks for replying. I see what you are saying in Affinity Photos. 

I only have Affinity Designer, is there anyway to sketch the edge in Affinity Designer?