If you have a square image that you make round and want a transparent edge to,(so it appears just round, not round in a square white box) first set the background on the page to transparent, (so when you copy as a new image it will use the last settings for the page and paste to a transparent page).Then go to file Eport>export as Gif optimiser. You will need to play around with the settings in the wizard so that you don't get black lines around small pixels of colour, but it can be done quite easily. You can then insert the image into progs. such as Publisher, as a round image and transparent square !!
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