Attachment_fu - convert an image to 8-bit text

hi all

I’m using attachment_fu to handle a bunch of uploaded images (jpgs). I
have a controller where i want to send two images in the response,
converted to 8 bit text, all in one string, like

render :text => “LOGO1=,LOGO2=”

Can i do this conversion in a simple way with attachment_fu? Or by some
other method?