@ZATOPEK a couple things to consider when comparing noise effects :
Affinity adds a white noise on a pixel basis (each pixel value seem independent of its neighbours), it is not a grain effect or 2D noise where neighboring pixels would have correlated values.
document size in pixel will influence greatly the size of the noise "particles". A smaller document will have bigger noise particle size in relation to vector shape, than the same noise applied to the same shape on a higher resolution document
Affinity rendering engine is very well optimized for fast rendering of multiple layers and uses dynamic image resampling based on display zoom. So, relative noise size will change as you zoom in and out. This can confuse you in thinking you have large noise grains at low zoom settings. But when you zoom in, you see the noise gets smaller and smaller
same goes for exporting. If you export at low resolution, you will get large noise grains. If you export at higher resolution, you will get smaller noise grains. Noise grains are one pixel always
a way to get a more accurate view in both AD and VS is to switch from vector to pixel view mode. You will avoid the display oversampling at high zoom settings.
AD's noise in color chooser is smart and very easy to use, but it lacks configurability.
On the other hand VS White Noise image effect is less immediate, but offers much more configurability (experiment with different noise types - random parameter, limit, amount, blend type ...) and you can get all sorts of variations.
On SVG export, both AD and VS need to rasterize the noise into a clipping mask as noise is not a standard SVG attribute.
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