How to use high pass filter for Affinity Photo tutorial

The high pass filter in Affinity Photo is for sharpening edges of images (as well as creating interesting glows etc).

High pass filter in Affinity Photo

  1. Filters menu in Affinity Photo

  2. Sharpen

  3. High pass

  4. Set radius etc

  5. Apply the high pass filter


The high pass filter for Affinity Photo can be found in the sharpen menu (beneath the filter menu). The HPF is a powerful tool for creating all kinds of sharpening the edge of images and embossed edge-like effects and much more.


Video tutorial on the subject by (youtube)


affinity photo high pass panelThere are not many options available, just two and that is the radius of the effect and the monochome option (which is a bit of an odd one as you can always change the color to a black and white etc / monochrome etc by using the HPF with an adjustment layer.


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The radius at 0 shows hardly anything beyond a very gray image but as you increase the radius setting to change the edge sharpening, you will see more and more of the original image and more of a glow around the image though you will never remove the grayness. At the very highest setting, the HPF gives a slightly surreal gray glow to the image and very little of the fine edge sharpening effect.


You can also use the mouse to modify the setting of the radius by dragging across the image (though it is not so effective in this filter).


high pass filter layers filter in affinity photoIf I am using the filters, I generally go for a duplicate of the image before I start to use a filter such as the HPF as I can always then just delete the result if I am not happy with it but it gives me an option to blend the result with the original and that may have even better results than just the single application.


To duplicate the current image, go to the layer menu and duplicate and then use the sharpening feature. Go to the layer menu and change the blending mode as required (such as linear light). The HPF does not block you in changing the blending mode so you can alter that as you set the setting for the radius (on my version, the result is not instant but it certainly better than changing the blend and back to the filter etc). You can then use the HPF for some interesting glow effects say in color burn blending mode


high pass filter liveInstead of using a layer and blending modes, you can also use the HPF as a live filter layer via the layer menu and the layer has the blending mode (best results for sharpening use the linear light) and opacity built in and it is live so the result can be changed at any point as well as deleted.


In some tasks, the live filter proves a very useful alternative and especially combined with adjustment layers as it does mean instead of creating a gray look (which, of course, is not the real intention of the filter unless you want it to be) you can have a blue and red image but if the HPF is purely a tool to generate a layer to blend and mix with the original, that is not such an issue anyway.


You can also add into the mix any of the other (albeit) small number of sharpen filters as well as blurs etc all as live filters which can be changed and tweaked depending on the project.


If you wish to apply it to all layers, de-select all the layers. If you wish to apply it to a particular layer, select that layer


For example, goto the Layer menu and New live filter layer and HPF and Set radius (probably best to be around 1px but depends on the image and result required) and Set monochrome or not and Set blending mode to linear light or another mode and then Set opacity and then Close or just ignore the panel.


It can be used for some very subtle edge shapening changes and final touches for an image. It can also be used for a whole lot more such glows, ghostly effects and more


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