Update man pages about blur method options
Signed-off-by: Yuxuan Shui <yshuiv7@gmail.com>
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@ -392,6 +392,7 @@ Available options of the 'blur' section are: ::
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*method*:::
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A string. Controls the blur method. Corresponds to the `--blur-method` command line option. Available choices are:
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'none' to disable blurring; 'gaussian' for gaussian blur; 'box' for box blur; 'kernel' for convolution blur with a custom kernel.
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Note: 'gaussian' and 'box' blur methods are only supported by the experimental backends.
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*size*:::
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An integer. The size of the blur kernel, required by 'gaussian' and 'box' blur methods. For the 'kernel' method, the size is included in the kernel. Corresponds to the `--blur-size` command line option.
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