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Affinity Photo - convert to hard black/white, suggested workflow


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I'd be grateful for suggestions on how to replicate the workflow I currently have with Photoshop for processing these images. I do a lot of laser engraving work, and for that I need crisp black/white bitmaps which I can trace (in Inkscape) to produce a vector file. Input image is e.g. a photo of a woodcut engraving, an ink sketch etc. In Photoshop, I first change the mode to grayscale, then use the brightness/contrast dialog with "Use Legacy" ticked, maximum contrast, and adjust the brightness to get the desired amount of edge detail. Then obviously touch up the final image manually.

This process has worked great, but I'm trying to find a way to replicate it in Affinity Photo.

The brightness/contrast adjustment doesn't have something comparable to the "legacy" option. So if I crank contrast up to 100, it doesn't give dead black/whites. Is there any way of doing this?

I finally tried using the posterise adjustment with 2 colors, which sort of does the trick, but I can't adjust the "threshold" like I could by adjusting the brightness slider.

On a separate note, Photoshop has a very useful filter called Median, under noise reduction. When this is applied to a black/white image, it sort of smooths out the edges, which makes tracing a lot better. Anything like this in Affinity?

image.jpeg.a6ef9d3b14ef5c79d879418cb6da27ad.jpeg

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