Creating accurate mask in PS CS4

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hi. i'm using photoshop cs4 , trying cleanly select flower. flower has white background i'd remove; i've used select > color range. however, still leaves rough edges around flower's petals. becomes apparent when drop black background behind flower -- has fuzzy edges needed have been selected , removed.

any ideas on how cleanly remove background , not have jagged edges? thank you.

belly learnin' bar. it's free, , open, as want, @ time:

http://www.adobeforums.com/cgi-bin/webx?128@@.3bb80e5d

:)


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