Scene7 Image Serving (IS) doesn't offer a posterization command. Instead, try using the quantize command (only supported with GIF images).

For instructions, see:

http://microsite.omniture.com/t2/help/en_US/s7/is_ir_api/index.html#is_api-http_ref-quantize

Example:

http://s7d4.scene7.com/is/image/ajhco/bluechair?$product$&fmt=gif&quantize=web,off,16

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