Problem with transparent image

hi everyone,

 

i'm having problem embedding transparent image pdf. thin border appears  when viewing document adobe reader, adobe acrobat pro , foxit reader. there no such border in image.

 

after experiments found border appears on edge of transparent black , opaque white areas. , changing transparent black color transparent white removes border.

 

is expected behaviour of adobe reader or bug? explain in other cases such artifacts may appear?

 

thanks in advance.

you need post example pdf demonstrates problem.

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