Rails - May 2006 - send_data not working properly with link_remote_to

I''m reading an image in an link_to_remote call,and then using send_data
i send the read image as :type => "image/png" :disposition => 
"inline"...but when the div tag gets updated i see only ascii
characters
.....but if i do the same operation using normal call(link_to) i see it 
functioning normal ....could someone explain .

my view:
<%= link_to_remote("flip",
     :update => "img",
     :url => {:action => "flip"}
     )%>
<div id="img"></div>

controller:
def flip
   filename="/public/picture/filename/1/scaler_1.jpg"
    img=File.read(filename)
    ilist = Magick::ImageList.new
    @picture=ilist.from_blob(img)
    @picthumb=@picture.flip!
    @out=@picthumb.to_blob
    send_data(@out,:filename =>''workshopimage'', :type =>
"image/png",
:disposition => "inline")
end

the above doesnt work
but with my view as
<%= link_to("flip",
     :action => "flip"
     )%>
it works....so doesnt it mean i need to do some thing more incase of an 
ajax call ..am i missing something ..?

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