How to use maximum blur filter for Affinity Photo tutorial

The maximum blur filter for Affinity Photo is a powerful blurring tool to emphasis the white or lightness of an image.

Maximum blur filter

how to use maximum blur filter for Affinity Photo tutorial
  1. Filters menu in Affinity Photo

  2. Blur

  3. Maximum blur filter (MBF)

  4. Set radius

  5. Set circular

  6. Apply

It can be used to create interesting sparkle effects with the lightness / white of the image. It can be used to totally blur and lose an image in intense white and lightness.


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The MBF for Affinity Photo can be found in a sub menu of the blur filter category (found in the filter menu). The maximum blur filter is a destructive filter that can be used with images as well as resources such as fonts and brushes etc. The key point of the filter is that it blurs and intensifies the white / lightness of an image resulting a smudge or sparkle. to any image.


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The MBF comes with only two settings radius and circular.


If you select circular, the blurring is circular (dots) or the blurring is square by default. The MBF radius can be set to 0 (no blur) to 100 (total white blurring of an image though that does depend on the size of the image). Any white in the image will be blurred into the darker parts of the image. If you use a low setting of radius then the result will generally be a sparkling effect. If you use a very high setting then the result will be a far more white smudged image.


The MBF is easiest to use by duplicating the original image and then using the MBF on the new layer. If you use the MBF on a layer, you can delete the layer but you can also combine the layer and effect with blending modes and opacity.


There is no live filter layer for the MBF so the layer approach is closest to the live filter approach. You can also create interesting effects by duplicating the layer and applying the MBF and re-sizing the layer (as well as rotating).


glowThe MBF can be used on its own. The filter can also be used with other filters such as Gaussian blur. You can use the effects pre or post the MBF to create all kinds of unique images.


The filter also works amazing well with live adjustment layers so you can add channel mixer adjustment layer to modify the color of the filter result

channelsYou can use the channels panel with the MBF


You can add different effects and settings to each channel


Channels panel and then Select red channel and apply with the required settings. Select green channel and Apply filter with different settings. Select blue channel and Apply filter with different settings


You can then merge them all back to a single RGB. You can also use the same effect with adjustment layers such as black and white adjustment layer. The channels option does allow for the interesting creation of edges in colors (if using different radius settings for the filter)


textYou can use the MBF with text. Create some text (in black) and then merge down. Use the maximum filter with that on a white background and the text will thin as you increase the radius setting.


If you use the same text but as a layer with the filter, you will see black text start to thicken as you increase the radius (using either square or circular).


Create some text using the artistic text tool. Set to black for the artistic text and Apply MBF with a low setting. The text becomes much bolder and nearly unreadable.


Create some text using the artistic tool and Set to black and Merge down via the layer menu with white background. Apply maximum blur filter with low setting (if set too high the text will just vanish). The text is a lot thinner.


Of course, if you are using a black on a blue background the result is totally different.


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