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Interactively select a color, and add an alpha channel containing the corresponding color mask.

Argument colorspace refers to the color metric used to compute color similarities, and can be basically
one of { rgb | lrgb | ycbcr | lab | lch | hsv | hsi | hsl | cmy | cmyk | yiq }.
You can also select one one particular channel of this colorspace, by setting colorspace as
colorspace_channel (e.g. hsv_h for the hue).

Default values:

colorspace=all, spatial_tolerance=5 and color_tolerance=5.