Vignette and saturation

Hi Sebastian,
it is not really a bug but i find this behaviour a little strange, anyway : it seems that if you want to have a Black & White picture by moving saturation to 0 ... and if you want to add some vignette, the vignette is not desaturated ...
so i've to save the BW picture and vignetting with another software.
using v1.4.19
vincent

it is not really a bug but i find this behaviour a little strange, anyway : it seems that if you want to have a Black & White picture by moving saturation to 0 ... and if you want to add some vignette, the vignette is not desaturated ...
so i've to save the BW picture and vignetting with another software.
using v1.4.19
vincent
