On Sun,  2 Aug 2015 17:35:59 +0200, Paul B Mahol wrote:

[...]

> +@item 0rdiv
> +@item 1rdiv
> +@item 2rdiv
> +@item 3rdiv
> +Set multiplicator for calculated value for each plane.

"Default is 1.0."

Can you use the word "multiplier" instead?

Mentioning range would be helpful, if possible.

> +@item 0bias
> +@item 1bias
> +@item 2bias
> +@item 3bias
> +Set bias for each plane. This value is added to result of above 
> multiplication.

"Set bias for each plane. This value is added to the result of the
multiplication. Useful for making the overall image brighter or darker.
Default is 0.0."

> +@end table
> +
> +@subsection Examples
> +
> +@itemize
> +@item
> +Apply sharpen:
> +@example
> +convolution="0 -1 0 -1 5 -1 0 -1 0:0 -1 0 -1 5 -1 0 -1 0:0 -1 0 -1 5 -1 0 -1 
> 0:0 -1 0 -1 5 -1 0 -1 0"
> +@end example

How about some presets like the curves filter?

Rest of the docs looks good to me.
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