If I use "Selective Gaussian Blur" in Gimp, only one CPU gets used. My PC has four.
Is there a way to tell Gimp to use all available CPUs?
Some operations take quite long, and this would reduce the time I need to wait.
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As an alternative we can use the third-party plugin G'MIC which claims to at least partially support multi-threading. This plugin is available through the gimp-plugin-registry or newer version from ppa:otto-kesselgulasch/gimp.