Silhouette from an image How can I create silhouette from an image in linux using the terminal? By creating silhouette I mean - how do I turn the RGB components values of an RGBA image to #000000, while _preserving_ the alpha component value?

You could use `convert` from `ImageMagick`:


convert -fill '#000' +opaque '#000'


What it does it changes all the colors not matching `#000` to `#000`.