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Jim Sachs quote:
"When the plant is photographed against a blue background, then clipped out in a paint program by turning blue to transparent, the object still has an outline of almost-blue pixels that acted as anti-aliasing."
That came from a rather old post. If you plan on doing this sort of work in the future, you might consider investing in proper chroma keying software such as Ultimatte (available as a Photoshop plugin). You will find that matting out becomes a total breeze as your 'blue screen' pixels are completely eliminated with varying degrees of transparency. Blue spill is also handled automatically in most cases. Needless to say if the plants you are photographing are predominantly green then you are much better off using orange screen.
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