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The "Transparent" value is similar to "None" in that it represents no color, however, while "None" will be interpreted by some controls as don't-draw-anything, "Transparent" will be interpreted as draw something invisible. For example, when using swatches in the Tree control, "None" means no swatch whereas "Transparent" means an invisible swatch. This is useful for making sure tree items still line up but leaving empty spaces for items with no swatch.
Additionally, The Color Fill technology can accept "Transparent" as one of the colors in a gradient, thus allowing you to fade a color into nothing for some interesting effects.
In all cases unrecognized or Null values are treated as "Auto" values.
