Prepare scanned Drawing for Bitmap Tracing

[xresch]

(This is as well a workaround for auto tracing, until Affinity Designer will include it in an upcoming version.)
In this tutorial I will show you how you can prepare a scanned handdrawing with Affinity Photo for bitmap tracing, to get a result with smooth lines and less speckles. As Affinity Designer is currently not shipped with a built in feature for tracing bitmaps, I will use InkScape for vectorization of the image.