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Technique request - depth of field blur


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Hey, I was wondering if anyone had figured out a way to use a mask, or a z-depth image to blur an image?

In Photoshop you can use a black and white image to partially blur an image, to get a narrow depth-of-field effect:

 

I've already tried to use a full-image blur with a mask, but that gives 80s-esque halo effects. The halo is there because the whole image (BG+dress) is blurred, while the dress should not be taken in to consideration for the BG-blur. It is quite noticable around the dress here:

image.thumb.png.8c3c9bfd4f64f691cb35b4065fc19d77.png

Anyone have a usable method for this effect in Affinity?

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Having selected your unblurred target (such as the dress and occupant), you need to cut it out (to the clipboard) using ctrl-X or cmnd-X.  Then activate the gaussian blur filter making sure that you tick Preserve Alpha. Then paste your clipboard back nto your image using ctrl-V.or cmnd-V

Ticking Preserve Alpha ensures that the blurring is not affected by the transparent hole.

John

Windows 10, Affinity Photo 1.10.5 Designer 1.10.5 and Publisher 1.10.5 (mainly Photo), now ex-Adobe CC

CPU: AMD A6-3670. RAM: 16 GB DDR3 @ 666MHz, Graphics: 2047MB NVIDIA GeForce GT 630

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