![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh1Fzd2j2ji53K5WpUouIhHux_OWRLh_y3GH7dwLK-w-iimCHTUxzvAMoSZA8YeikZ9ssyYl5MluowSY6DnaGWuX-mfETR__ti7v_UQ54Aimu86La7YW_s2504J-8tczLuSQfQf/s200/picasa_filtered_bw1.jpg)
And filtering on green color usually gives the best in noise reduction in the final b&w picture. Very neat and easy to do in Picasa. In the color picker, you simply need to pick a color channel to filter the b&w picture on. As you move the mouse over different color in the picker, you can see the changes in the picture.
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